From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pierre Louis Aublin Subject: loopback interface - why checksum on header? Date: Sat, 23 Jul 2011 18:30:18 +0200 Message-ID: <4E2AF71A.6080703@inria.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from mail4-relais-sop.national.inria.fr ([192.134.164.105]:61920 "EHLO mail4-relais-sop.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752919Ab1GWQaV (ORCPT ); Sat, 23 Jul 2011 12:30:21 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hello everybody I am wondering why the checksum of packets sent through the loopback interface is computed on the header only. If I understand correctly, it is assumed that a message cannot be corrupted in RAM, thus there is no need to verify the integrity of the whole message. However, in that case, there is also no need to compute it on the header. Consequently, why is it not the case? Thank you in advance Pierre Louis Aublin