INET TECHNOLOGIES, INC.

COMMON STOCK, PAR VALUE $.001 PER SHARE

UNDERWRITING AGREEMENT
(INTERNATIONAL VERSION)

__________, 1998

Goldman Sachs International,
Dain Rauscher Wessels, a division of
Dain Rauscher Incorporated
Hambrecht & Quist LLC
As representatives of the several Underwriters
named in Schedule I hereto,
c/o Goldman Sachs International,
Peterborough Court,
133 Fleet Street,
London EC4A 2BB, England

Ladies and Gentlemen:

Inet Technologies, Inc., a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
to the Underwriters named in Schedule I hereto (the "Underwriters") an
aggregate of _____________shares and, at the election of the Underwriters, up
to ___________additional shares of Common Stock, par value $.001 per share
("Stock"), of the Company and the stockholders of the Company named in Schedule
II hereto (the "Selling Stockholders") propose, subject to the terms and
conditions stated herein, to sell to the Underwriters an aggregate of
________shares of Stock. The aggregate of ___________shares to be sold by the
Company and the Selling Stockholders is herein called the "Firm Shares" and
_________additional shares to be sold by the Company are herein called the
"Optional Shares." The Firm Shares and the Optional Shares which the
Underwriters elect to purchase pursuant to Section 2 hereof are herein
collectively called, the "Shares."

It is understood and agreed to by all parties that the Company and the
Selling Stockholders are concurrently entering into an agreement, a copy of
which is attached hereto (the "U.S. Underwriting Agreement"), providing for the
sale by the Company and the Selling Stockholders of up to a total of
_________shares of Stock (the "U.S. Shares"), including the overallotment
option thereunder, through arrangements with certain underwriters in the United
States (the "U.S. Underwriters"), for whom Goldman, Sachs & Co., Dain Rauscher
Wessels, a division of Dain Rauscher Incorporated and Hambrecht & Quist LLC are
acting as representatives. Anything herein or therein to the contrary
notwithstanding, the respective closings under this Agreement and the U.S.
Underwriting Agreement are hereby expressly made conditional on one another.
The Underwriters hereunder and the U.S. Underwriters are simultaneously
entering into an Agreement between U.S. and International Underwriting
Syndicates (the "Agreement between Syndicates") which provides, among other
things, for the transfer of shares of Stock between the two syndicates and for
consultation by the Lead Manager hereunder with Goldman, Sachs & Co. prior to
exercising the rights of the Underwriters under Section 7 hereof. Two forms of
prospectus are to be used in connection with the offering and sale of shares of
Stock contemplated by the foregoing, one relating to the Shares hereunder and
the other relating to the U.S. Shares. The latter form of prospectus will
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be identical to the former except for certain substitute pages. Except as used
in Sections 2, 3, 4, 9 and 11 herein, and except as context may otherwise
require, references hereinafter to the Shares shall include all of the shares
of Stock which may be sold pursuant to either this Agreement or the U.S.
Underwriting Agreement, and references herein to any prospectus whether in
preliminary or final form, and whether as amended or supplemented, shall
include both the U.S. and the international versions thereof.

In addition, this Agreement incorporates by reference certain
provisions from the U.S. Underwriting Agreement (including the related
definitions of terms, which are also used elsewhere herein) and, for purposes
of applying the same, references (whether in these precise words or their
equivalent) in the incorporated provisions to the "Underwriters" shall be to
the Underwriters hereunder, to the "Shares" shall be to the Shares hereunder as
just defined, to "this Agreement" (meaning therein the U.S. Underwriting
Agreement) shall be to this Agreement (except where this Agreement is already
referred to or as the context may otherwise require) and to the representatives
of the Underwriters or to Goldman, Sachs & Co. shall be to the addressees of
this Agreement and to Goldman Sachs International ("GSI"), and, in general, all
such provisions and defined terms shall be applied mutatis mutandis as if the
incorporated provisions were set forth in full herein having regard to their
context in this Agreement as opposed to the U.S. Underwriting Agreement.

1. The Company and each of the several Selling Stockholders
hereby make to the Underwriters the same respective representations, warranties
and agreements as are set forth in Section 1 of the U.S. Underwriting
Agreement, which Section is incorporated herein by this reference.

2. Subject to the terms and conditions herein set forth, (a) the
Company and each of the Selling Stockholders agree, severally and not jointly,
to sell to each of the Underwriters, and each of the Underwriters agrees,
severally and not jointly, to purchase from the Company and each of the Selling
Stockholders, at a purchase price per share of $_________, the number of Firm
Shares (to be adjusted by you so as to eliminate fractional shares) determined
by multiplying the aggregate number of Firm Shares to be sold by the Company
and each of the Selling Stockholders as set forth opposite their respective
names in Schedule II hereto by a fraction, the numerator of which is the
aggregate number of Firm Shares to be purchased by such Underwriter as set
forth opposite the name of such Underwriter in Schedule I hereto and the
denominator of which is the aggregate number of Firm Shares to be purchased by
all the Underwriters from the Company and all the Selling Stockholders
hereunder and (b) in the event and to the extent that the Underwriters shall
exercise the election to purchase Optional Shares as provided below, the
Company agrees to sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company,
at the purchase price per share set forth in clause (a) of this Section 2, that
portion of the number of Optional Shares as to which such election shall have
been exercised (to be adjusted by you so as to eliminate fractional shares)
determined by multiplying such number of Optional Shares by a fraction the
numerator of which is the maximum number of Optional Shares which such
Underwriter is entitled to purchase as set forth opposite the name of such
Underwriter in Schedule I hereto and the denominator of which is the maximum
number of Optional Shares that all of the Underwriters are entitled to purchase
hereunder.

The Company, as and to the extent indicated in Schedule II hereto,
hereby grants to the Underwriters the right to purchase at their election up
to__________Optional Shares, at the purchase price per share set forth in the
paragraph above, for the sole purpose of covering overallotments in the sale of
the Firm Shares. Any such election to purchase Optional Shares may be
exercised only by written notice from you to the Company, given within a period
of 30 calendar days after the date of this Agreement and setting forth the
aggregate number of Optional Shares to be purchased and the date on which such
Optional Shares are to be delivered, as determined by you but in no event
earlier than the First Time of Delivery (as defined in Section 4 hereof) or,
unless you and the Company otherwise agree in writing, earlier than two or
later than ten business days after the date of such notice.

3. Upon the authorization by GSI of the release of the Firm
Shares, the several Underwriters propose to offer the Firm Shares for sale upon
the terms and conditions set forth in the Prospectus and in the forms of

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Agreement among Underwriters (International Version) and Selling Agreements,
which have been previously submitted to the Company by you. Each Underwriter
hereby makes to and with the Company and the Selling Stockholders the
representations and agreements of such Underwriter as a member of the selling
group contained in Sections 3(d) and 3(e) of the form of Selling Agreements.

4. (a) The Shares to be purchased by each Underwriter
hereunder, in definitive form, and in such authorized denominations and
registered in such names as Goldman, Sachs & Co. may request upon at least
forty-eight hours' prior notice to the Company and the Selling Stockholders
shall be delivered by or on behalf of the Company and the Selling Stockholders
to Goldman, Sachs & Co., through the facilities of The Depository Trust Company
("DTC"), for the account of such Underwriter, against payment by or on behalf
of such Underwriter of the purchase price therefor by wire transfer of Federal
(same-day) funds to the account specified by the Company and the Custodian to
Goldman, Sachs & Co. at least forty-eight hours in advance. The Company will
cause the certificates representing the Shares to be made available for
checking and packaging at least twenty-four hours prior to the Time of Delivery
(as defined below) with respect thereto at the office of DTC or its designated
custodian (the "Designated Office"). The time and date of such delivery and
payment shall be, with respect to the Firm Shares, 9:30 a.m., New York City
time, on _________, 1998 or such other time and date as Goldman, Sachs & Co.
and the Company may agree upon in writing, and, with respect to the Optional
Shares, 9:30 a.m., New York time, on the date specified by Goldman, Sachs & Co.
in the written notice given by Goldman, Sachs & Co. of the Underwriters'
election to purchase such Optional Shares, or such other time and date as
Goldman, Sachs & Co. and the Company may agree upon in writing. Such time and
date for delivery of the Firm Shares is herein called the "First Time of
Delivery", such time and date for delivery of the Optional Shares, if not the
First Time of Delivery, is herein called the "Second Time of Delivery", and
each such time and date for delivery is herein called a "Time of Delivery."

(b) The documents to be delivered at each Time of
Delivery by or on behalf of the parties hereto pursuant to Section 7 of the
U.S. Underwriting Agreement, including the cross-receipt for the Shares and any
additional documents requested by the Underwriters pursuant to Section 7(m) of
the U.S. Underwriting Agreement, will be delivered at the offices of Brobeck,
Phleger & Harrison LLP, 301 Congress Avenue, Suite 1200, Austin, Texas 78701
(the "Closing Location"), and the Shares will be delivered at the Designated
Office, all at each Time of Delivery. A meeting will be held at the Closing
Location at 6:00 p.m., New York City time, on the New York Business Day next
preceding each Time of Delivery, at which meeting the final drafts of the
documents to be delivered pursuant to the preceding sentence will be available
for review by the parties hereto. For the purposes of this Section 4, "New
York Business Day" shall mean each Monday, Tuesday, Wednesday, Thursday and
Friday which is not a day on which banking institutions in New York are
generally authorized or obligated by law or executive order to close.

5. The Company hereby makes with the Underwriters the same
agreements as are set forth in Section 5 of the U.S. Underwriting Agreement,
which Section is incorporated herein by this reference.

6. The Company, each of the Selling Stockholders, and the
Underwriters hereby agree with respect to certain expenses on the same terms as
are set forth in Section 6 of the U.S. Underwriting Agreement, which Section is
incorporated herein by this reference.

7. Subject to the provisions of the Agreement between Syndicates,
the obligations of the Underwriters hereunder shall be subject, in their
discretion, at each Time of Delivery to the condition that all representations
and warranties and other statements of the Company, and the Selling
Stockholders herein are, at and as of such Time of Delivery, true and correct,
the condition that the Company and the Selling Stockholders shall have
performed all of their respective obligations hereunder theretofore to be
performed, and additional conditions identical to those set forth in Section 7
of the U.S. Underwriting Agreement, which Section is incorporated herein by
this reference.

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8. (a) The Company and each of Samuel S. Simonian, Elie S.
Akilian, Mark A. Weinzierl and William H. Mina (collectively, the "Management
Selling Stockholders"), jointly and severally, will indemnify and hold harmless
each Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse
each Underwriter for any legal or other expenses reasonably incurred by such
Underwriter in connection with investigating or defending any such action or
claim as such expenses are incurred; provided, however, that the Company and
the Management Selling Stockholders shall not be liable in any such case to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement or omission or alleged
omission made in any Preliminary Prospectus, the Registration Statement or the
Prospectus or any such amendment or supplement in reliance upon and in
conformity with written information furnished to the Company by any Underwriter
through GSI expressly for use therein; provided further, that the liability of
each Management Selling Stockholder pursuant to this subsection (a) shall not
exceed the product of the number of Shares sold by such Management Selling
Stockholder and the public offering price of the Shares as set forth in the
Prospectus.

(b) Each of the Selling Stockholders (other than the
Management Selling Stockholders) will indemnify and hold harmless each
Underwriter against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions
in respect thereof) arise out of or are based upon an untrue statement or
alleged untrue statement of a material fact contained in any Preliminary
Prospectus, the Registration Statement or the Prospectus, or any amendment or
supplement thereto, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company by such Selling Stockholder expressly for use therein;
and will reimburse each Underwriter for any legal or other expenses reasonably
incurred by such Underwriter in connection with investigating or defending any
such action or claim as such expenses are incurred; provided, however, that
such Selling Stockholder shall not be liable in any such case to the extent
that any such loss, claim, damage or liability arises out of or is based upon
an untrue statement or alleged untrue statement or omission or alleged omission
made in any Preliminary Prospectus, the Registration Statement or the
Prospectus or any such amendment or supplement in reliance upon and in
conformity with written information furnished to the Company by any Underwriter
through Goldman, Sachs & Co. expressly for use therein; provided, further, that
the liability of a Selling Stockholder pursuant to this subsection (b) shall
not exceed the product of the number of Shares sold by such Selling Stockholder
and the public offering price of the Shares as set forth in the Prospectus.

(c) Each Underwriter will indemnify and hold harmless the
Company and each Selling Stockholder against any losses, claims, damages or
liabilities to which the Company or such Selling Stockholder may become
subject, under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon an
untrue statement or alleged untrue statement of a material fact contained in
any Preliminary Prospectus, the Registration Statement or the Prospectus, or
any amendment or supplement thereto, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, in
each case to the extent, but only to the extent, that such untrue statement or
alleged untrue statement or omission or alleged omission was made in any
Preliminary Prospectus, the Registration Statement or the Prospectus or any
such

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amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Underwriter through GSI expressly
for use therein; and will reimburse the Company and each Selling Stockholder
for any legal or other expenses reasonably incurred by the Company or such
Selling Stockholder in connection with investigating or defending any such
action or claim as such expenses are incurred.

(d) Promptly after receipt by an indemnified party under
subsection (a), (b) or (c) above of notice of the commencement of any action,
such indemnified party shall, if a claim in respect thereof is to be made
against an indemnifying party under such subsection, notify the indemnifying
party in writing of the commencement thereof; but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
any indemnified party otherwise than under such subsection. In case any such
action shall be brought against any indemnified party and it shall notify the
indemnifying party of the commencement thereof, the indemnifying party shall be
entitled to participate therein and, to the extent that it shall wish, jointly
with any other indemnifying party similarly notified, to assume the defense
thereof, with counsel satisfactory to such indemnified party (who shall not,
except with the consent of the indemnified party, be counsel to the
indemnifying party), and, after notice from the indemnifying party to such
indemnified party of its election so to assume the defense thereof, the
indemnifying party shall not be liable to such indemnified party under such
subsection for any legal expenses of other counsel or any other expenses, in
each case subsequently incurred by such indemnified party, in connection with
the defense thereof other than reasonable costs of investigation. No
indemnifying party shall, without the written consent of the indemnified party,
effect the settlement or compromise of, or consent to the entry of any judgment
with respect to, any pending or threatened action or claim in respect of which
indemnification or contribution may be sought hereunder (whether or not the
indemnified party is an actual or potential party to such action or claim)
unless such settlement, compromise or judgment (i) includes an unconditional
release of the indemnified party from all liability arising out of such action
or claim and (ii) does not include a statement as to or an admission of fault,
culpability or a failure to act, by or on behalf of any indemnified party.

(e) If the indemnification provided for in this Section 8
is unavailable to or insufficient to hold harmless an indemnified party under
subsection (a), (b) or (c) above in respect of any losses, claims, damages or
liabilities (or actions in respect thereof) referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities
(or actions in respect thereof) in such proportion as is appropriate to reflect
the relative benefits received by the Company and the Selling Stockholders on
the one hand and the Underwriters on the other from the offering of the Shares.
If, however, the allocation provided by the immediately preceding sentence is
not permitted by applicable law or if the indemnified party failed to give the
notice required under subsection (d) above, then each indemnifying party shall
contribute to such amount paid or payable by such indemnified party in such
proportion as is appropriate to reflect not only such relative benefits but
also the relative fault of the Company and the Selling Stockholders on the one
hand and the Underwriters on the other in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities (or
actions in respect thereof), as well as any other relevant equitable
considerations. The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering of the
Shares purchased under this Agreement (before deducting expenses) received by
the Company and the Selling Stockholders bear to the total underwriting
discounts and commissions received by the Underwriters with respect to the
Shares purchased under this Agreement, in each case as set forth in the table
on the cover page of the Prospectus. The relative fault shall be determined by
reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission to state a
material fact relates to information supplied by the Company or the Selling
Stockholders on the one hand or the Underwriters on the other and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Company, each of the Selling
Stockholders and the Underwriters agree that it would not be just and equitable
if contributions pursuant to this subsection (e) were

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determined by pro rata allocation (even if the Underwriters were treated as one
entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to above in this
subsection (e). The amount paid or payable by an indemnified party as a result
of the losses, claims, damages or liabilities (or actions in respect thereof)
referred to above in this subsection (e) shall be deemed to include any legal
or other expenses reasonably incurred by such indemnified party in connection
with investigating or defending any such action or claim. Notwithstanding the
provisions of this subsection (e), no Underwriter shall be required to
contribute any amount in excess of the amount by which the total price at which
the Shares underwritten by it and distributed to the public were offered to the
public exceeds the amount of any damages which such Underwriter has otherwise
been required to pay by reason of such untrue or alleged untrue statement or
omission or alleged omission. No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. The Underwriters' obligations in this subsection (e) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

(f) The obligations of the Company and the Selling
Stockholders under this Section 8 shall be in addition to any liability which
the Company and the respective Selling Stockholders may otherwise have and
shall extend, upon the same terms and conditions, to each person, if any, who
controls any Underwriter within the meaning of the Act; and the obligations of
the Underwriters under this Section 8 shall be in addition to any liability
which the respective Underwriters may otherwise have and shall extend, upon the
same terms and conditions, to each officer and director of the Company
(including any person who, with his or her consent, is named in the
Registration Statement as about to become a director of the Company) and to
each person, if any, who controls the Company or any Selling Stockholder within
the meaning of the Act.

9. (a) If any Underwriter shall default in its obligation to
purchase the Shares which it has agreed to purchase hereunder at a Time of
Delivery, you may in your discretion arrange for you or another party or other
parties to purchase such Shares on the terms contained herein. If within
thirty-six hours after such default by any Underwriter you do not arrange for
the purchase of such Shares, then the Company and the Selling Stockholders
shall be entitled to a further period of thirty-six hours within which to
procure another party or other parties satisfactory to you to purchase such
Shares on such terms. In the event that, within the respective prescribed
periods, you notify the Company and the Selling Stockholders that you have so
arranged for the purchase of such Shares, or the Company and the Selling
Stockholders notify you that they have so arranged for the purchase of such
Shares, you or the Company and the Selling Stockholders shall have the right to
postpone such Time of Delivery for a period of not more than seven days, in
order to effect whatever changes may thereby be made necessary in the
Registration Statement or the Prospectus, or in any other documents or
arrangements, and the Company agrees to file promptly any amendments to the
Registration Statement or the Prospectus which in your opinion may thereby be
made necessary. The term "Underwriter" as used in this Agreement shall include
any person substituted under this Section with like effect as if such person
had originally been a party to this Agreement with respect to such Shares.

(b) If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Company and the Selling Stockholders as provided in subsection (a) above,
the aggregate number of such Shares which remains unpurchased does not exceed
one-eleventh of the aggregate number of all the Shares to be purchased at such
Time of Delivery, then the Company and the Selling Stockholders shall have the
right to require each non-defaulting Underwriter to purchase the number of
shares which such Underwriter agreed to purchase hereunder at such Time of
Delivery and, in addition, to require each non-defaulting Underwriter to
purchase its pro rata share (based on the number of Shares which such
Underwriter agreed to purchase hereunder) of the Shares of such defaulting
Underwriter or Underwriters for which such arrangements have not been made; but
nothing herein shall relieve a defaulting Underwriter from liability for its
default.

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(c) If, after giving effect to any arrangements for the
purchase of the Shares of a defaulting Underwriter or Underwriters by you and
the Company and the Selling Stockholders as provided in subsection (a) above,
the aggregate number of such Shares which remains unpurchased exceeds
one-eleventh of the aggregate number of all the Shares to be purchased at such
Time of Delivery, or if the Company and the Selling Stockholders shall not
exercise the right described in subsection (b) above to require non-defaulting
Underwriters to purchase Shares of a defaulting Underwriter or Underwriters,
then this Agreement (or, with respect to the Second Time of Delivery, the
obligations of the Underwriters to purchase and of the Company to sell the
Optional Shares) shall thereupon terminate, without liability on the part of
any non-defaulting Underwriter or the Company or the Selling Stockholders,
except for the expenses to be borne by the Company and the Selling Stockholders
and the Underwriters as provided in Section 6 hereof and the indemnity and
contribution agreements in Section 8 hereof; but nothing herein shall relieve a
defaulting Underwriter from liability for its default.

10. The respective indemnities, agreements, representations,
warranties and other statements of the Company, the Selling Stockholders and
the several Underwriters, as set forth in this Agreement or made by or on
behalf of them, respectively, pursuant to this Agreement, shall remain in full
force and effect, regardless of any investigation (or any statement as to the
results thereof) made by or on behalf of any Underwriter or any controlling
person of any Underwriter, or the Company or any of the Selling Stockholders,
or any officer or director or controlling person of the Company or any
controlling person of any Selling Stockholders, and shall survive delivery of
and payment for the Shares.

11. If this Agreement shall be terminated pursuant to Section 9
hereof, neither the Company nor the Selling Stockholders shall then be under
any liability to any Underwriter except as provided in Section 6 and Section 8
hereof; but, if for any other reason, any Shares are not delivered by or on
behalf of the Company and the Selling Stockholders as provided herein, the
Company and, if the Company fails to do so, each of the Selling Stockholders
pro rata (based on the number of Shares to be sold by the Company and such
Selling Stockholder hereunder), will reimburse the Underwriters through GSI for
all out-of-pocket expenses approved in writing by GSI, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Shares not so
delivered, but the Company and the Selling Stockholders shall then be under no
further liability to any Underwriter in respect of the Shares not so delivered
except as provided in Sections 6 and 8 hereof.

12. In all dealings hereunder, you shall act on behalf of each of
the Underwriters, and the parties hereto shall be entitled to act and rely upon
any statement, request, notice or agreement on behalf of any Underwriter made
or given by you jointly or by GSI on behalf of you as the representatives of
the Underwriters; and in all dealings with any Selling Stockholder hereunder,
you and the Company shall be entitled to act and rely upon any statement,
request, notice or agreement on behalf of such Selling Stockholder made or
given by any or all of the Attorneys-in-Fact for such Selling Stockholder.

All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex
or facsimile transmission to the Underwriters in care of GSI, Peterborough
Court, 133 Fleet Street, London EC4A 2BB, England, Attention: Equity Capital
Markets, Telex No. 94012165, facsimile transmission No. (071) 774-1550; if to
any Selling Stockholder shall be delivered or sent by mail, telex or facsimile
transmission to such Selling Stockholder at its address set forth in Schedule
III hereto; and if to the Company shall be delivered or sent by mail, telex or
facsimile transmission to the address of the Company set forth in the
Registration Statement, Attention: Chief Financial Officer; provided, however,
that any notice to an Underwriter pursuant to Section 8(c) hereof shall be
delivered or sent by mail, telex or facsimile transmission to such Underwriter
at its address set forth in its Underwriters' Questionnaire, or telex
constituting such Questionnaire, which address will be supplied to the Company
or the Selling Stockholders by GSI upon request. Any such statements,
requests, notices or agreements shall take effect upon receipt thereof.

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13. This Agreement shall be binding upon, and inure solely to the
benefit of, the Underwriters, the Company and the Selling Stockholders and, to
the extent provided in Sections 8 and 10 hereof, the officers and directors of
the Company and each person who controls the Company, any Selling Stockholder
or any Underwriter, and their respective heirs, executors, administrators,
successors and assigns, and no other person shall acquire or have any right
under or by virtue of this Agreement. No purchaser of any of the Shares from
any Underwriter shall be deemed a successor or assign by reason merely of such
purchase.

14. Time shall be of the essence of this Agreement.

15. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, UNITED STATES OF AMERICA.

16. This Agreement may be executed by any one or more of the
parties hereto in any number of counterparts, each of which shall be deemed to
be an original, but all such counterparts shall together constitute one and the
same instrument.

If the foregoing is in accordance with your understanding, please sign
and return to us seven counterparts hereof, and upon the acceptance hereof by
you, on behalf of each of the Underwriters, this letter and such acceptance
hereof shall constitute a binding agreement among each of the Underwriters, the
Company and each of the Selling Stockholders. It is understood that your
acceptance of this letter on behalf of each of the Underwriters is pursuant to
the authority set forth in a form of Agreement among Underwriters
(International Version), the form of which shall be furnished to the Company
and the Selling Stockholders for examination upon request, but without warranty
on your part as to the authority of the signers thereof.

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Any person executing and delivering this Agreement as Attorney-in-Fact
for a Selling Stockholder represents by so doing that he has been duly
appointed as Attorney-in-Fact by such Selling Stockholder pursuant to a validly
existing and binding Power of Attorney which authorizes such Attorney-in-Fact
to take such action.

Very truly yours,

INET TECHNOLOGIES, INC.

By:
---------------------------------
Name:
Title:

SAMUEL S. SIMONIAN
ELIE S. AKILIAN
MARK A. WEINZIERL
WILLIAM H. MINA
[NAMES OF OTHER SELLING STOCKHOLDERS]

By:
---------------------------------
Name:
Title:

As Attorney-in-Fact acting on behalf of each
of the Selling Stockholders named in Schedule
II to this Agreement.

Accepted as of the date hereof:

GOLDMAN SACHS INTERNATIONAL
DAIN RAUSCHER WESSELS, A DIVISION OF
DAIN RAUSCHER INCORPORATED,
HAMBRECHT & QUIST LLC

BY: GOLDMAN SACHS INTERNATIONAL

By:
----------------------------------
(Attorney-in-fact)

On behalf of each of the Underwriters

9
10
SCHEDULE I

NUMBER OF OPTIONAL
SHARES TO BE
TOTAL NUMBER OF PURCHASED IF
FIRM SHARES MAXIMUM OPTION
UNDERWRITER TO BE PURCHASED EXERCISED
-------------------------------------------------------------- ---------------- -----------------

Goldman, Sachs & Co. . . . . . . . . . . . . . . . . . . . . .
Dain Rauscher Wessels . . . . . . . . . . . . . . . . . . . . .
Hambrecht & Quist LLC . . . . . . . . . . . . . . . . . . . . .
Total . . . . . . . . . . . . . . . . . . . .

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SCHEDULE II

NUMBER OF OPTIONAL
SHARES TO BE
TOTAL NUMBER OF SOLD IF
FIRM SHARES MAXIMUM OPTION
TO BE SOLD EXERCISED
--------------- ----------------

The Company. . . . . . . . . . . . . . . . . . . . . . . . . .
The Selling Stockholders:
Samuel S. Simonian . . . . . . . . . . . . . . . . . .
Elie S Akilian . . . . . . . . . . . . . . . . . . . .
Mark A. Weinzierl . . . . . . . . . . . . . . . . . .
William H. Mina . . . . . . . . . . . . . . . . . . .
Total . . . . . . . . . . . . . . . . . . . . . . . . .

Each of the Selling Stockholders has appointed William H. Mina and
Mark A. Weinzierl, and each of them, as his Attorneys-in-Fact.
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SCHEDULE III

SELLING STOCKHOLDERS

Samuel S. Simonian

Elie S. Akilian

Mark A. Weinzierl

William H. Mina