EXHIBIT 32.2

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      I, Steven J. Gomo, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly
Report of Network Appliance, Inc., on Form 10-Q for the quarterly period ended
October 29, 2004 fully complies with the requirements of Section 13(a) or 15(d)
of the Securities Exchange Act of 1934, as amended, and that information
contained in such Quarterly Report on Form 10-Q fairly presents, in all material
respects, the financial condition and results of operations of Network
Appliance, Inc.

                                         /s/ STEVEN J. GOMO
                                         -----------------------------------
                                         Steven J. Gomo
                                         Executive Vice President of Finance
                                         and Chief Financial Officer

Date: December 8, 2004