EXHIBIT 23.1

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (File No.333-80177, 333-82249, 333-34570, 333-51878,
333-76272, 333-87618,333-102434, 333-104169, 333-109895, 333-112022, 333-116187,
333-122054 and 333-124092) of F5 Networks, Inc., of our report dated December 8,
2006, relating to the consolidated financial statements, financial statement
schedule, management's assessment of the effectiveness of internal control over
financial reporting and the effectiveness of internal control over financial
reporting, which appears in this Form 10-K.

PricewaterhouseCoopers LLP

Seattle, Washington
December 13, 2006