From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santwona.Behera@Sun.COM Subject: Question about IP-in-IP tunneling Date: Thu, 26 Feb 2009 13:07:02 -0800 Message-ID: <49A70476.8050300@Sun.COM> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=ISO-8859-1 Content-Transfer-Encoding: 7BIT To: netdev@vger.kernel.org Return-path: Received: from sca-es-mail-1.Sun.COM ([192.18.43.132]:39868 "EHLO sca-es-mail-1.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752693AbZBZVHc (ORCPT ); Thu, 26 Feb 2009 16:07:32 -0500 Received: from fe-sfbay-10.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id n1QL7SkL011153 for ; Thu, 26 Feb 2009 13:07:28 -0800 (PST) Received: from conversion-daemon.fe-sfbay-10.sun.com by fe-sfbay-10.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) id <0KFO00800YBHAT00@fe-sfbay-10.sun.com> for netdev@vger.kernel.org; Thu, 26 Feb 2009 13:07:28 -0800 (PST) Received: from [129.145.154.102] ([unknown] [129.145.154.102]) by fe-sfbay-10.sun.com (Sun Java(tm) System Messaging Server 7.0-3.01 64bit (built Dec 23 2008)) with ESMTPSA id <0KFO007JYYNQPF00@fe-sfbay-10.sun.com> for netdev@vger.kernel.org; Thu, 26 Feb 2009 13:07:04 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: A question for the IP tunneling experts: For IP-in-IP tunneling, what are the cases when IPROTO_IPIP (4) is used in the protocol field of the outer IP header and the cases when IPPROTO_IPV6 (41) is used instead? thanks, --santwona