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

In connection with the Quarterly Report of Foundry Networks, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Daniel W. Fairfax, Chief Financial Officer and Vice President Finance and Administration of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

	(1)		The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

	(2)		The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


		/s/ Daniel W. Fairfax
		Daniel W. Fairfax
		Vice President, Finance and Administration and
		Chief Financial Officer
		August 5, 2008

FOUNDRY NETWORKS INC 10-Q