Riverbed Technology (RVBD)

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q/A for the quarterly period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q/A fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q/A for the quarterly period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q/A fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q/A to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q/A), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Riverbed Technology, Inc. for the year ended December 31, 2008 as filed with the Securities and Exchange Commission on the date hereof, Jerry M. Kennelly, as President, and Chief Executive Officer, and Randy S. Gottfried, as Chief Financial Officer, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended June 30, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended June 30, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2008 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Riverbed Technology, Inc. for the year ended December 31, 2007 as filed with the Securities and Exchange Commission on the date hereof, Jerry M. Kennelly, as President, and Chief Executive Officer, and Randy S. Gottfried, as Chief Financial Officer, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended June 30, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended June 30, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended March 31, 2007 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Jerry M. Kennelly, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2006 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

I, Randy S. Gottfried, 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 Riverbed Technology, Inc. on Form 10-Q for the quarterly period ended September 30, 2006 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Riverbed Technology, Inc.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to Riverbed Technology, Inc. and will be retained by Riverbed Technology, Inc. and furnished to the Securities and Exchange Commission or its staff upon request. This certification “accompanies” the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.