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                                                                    Exhibit 23.3


                        INDEPENDENT ACCOUNTANTS' CONSENT




The Board of Directors
Unisphere Solutions, Inc.:


We consent to the inclusion of our reports dated October 15, 1999, with respect
to the consolidated balance sheet of Unisphere Solutions, Inc. and Subsidiaries
(an indirect wholly-owned subsidiary of Siemens AG) as of September 30, 1999,
and the related consolidated statements of operations, stockholders' equity and
cash flows for the period from January 12, 1999 (date of inception) to September
30, 1999, and the related schedule, which reports appear in this Registration
Statement, and to the reference to our firm under the heading "Experts" in this
Registration Statement on Form S-1.


                                                        /s/ KPMG LLP

Boston, Massachusetts
August 1, 2000