COSINE COMMUNICATIONS INC
S-1/A, EX-23.1, 2000-09-22
COMPUTER COMMUNICATIONS EQUIPMENT
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                                                                    EXHIBIT 23.1

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the reference to our firm under the captions "Selected
Consolidated Financial Data" and "Experts" and to the use of our report dated
March 2, 2000, in the Registration Statement (Form S-1 No. 333-35938) and
related Prospectus of CoSine Communications, Inc. for the registration of
10,000,000 shares of its common stock.


                                         /s/ ERNST & YOUNG LLP

Palo Alto, California
September 21, 2000



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