Exhibit 23.1

  Kost Forer Gabbay & Kasierer 3 Aminadav St. Tel-Aviv 67067, Israel Tel: 972 (3)6232525 Fax: 972 (3)5622555 www.ey.com

 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement on Form S-8 pertaining to the 2006 Compensation Incentive Plan of Allot Communications Ltd., of our report dated March 21, 2013, with respect to the consolidated financial statements and the effectiveness of internal control over financial reporting of Allot Communications Ltd. included in its annual report on Form 20-F for the year ended December 31, 2012, filed with the Securities and Exchange Commission.

/s/ Kost Forer Gabbay & Kasierer

KOST FORER GABBAY & KASIERER

A Member of Ernst & Young Global

Tel Aviv, Israel

March 21, 2013