From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: [PATCH 1/2] Doc: Fix rp_filter description in net/ipv4/Kconfig. Date: Fri, 20 Feb 2009 16:03:13 +0100 Message-ID: <1235142193.2351.41.camel@localhost.localdomain> References: <1235141957.2351.37.camel@localhost.localdomain> Reply-To: jdb@comx.dk Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "netdev@vger.kernel.org" , Kernel Janitors To: "David S. Miller" Return-path: Received: from lanfw001a.cxnet.dk ([87.72.215.196]:53153 "EHLO lanfw001a.cxnet.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751885AbZBTPDO (ORCPT ); Fri, 20 Feb 2009 10:03:14 -0500 In-Reply-To: <1235141957.2351.37.camel@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: Author: Jesper Dangaard Brouer Date: Fri Feb 20 15:20:57 2009 +0100 Doc: Fix rp_filter description in net/ipv4/Kconfig. The reverse path filter (rp_filter) will NOT get enabled when enabling forwarding. Read the code and tested in in practice. Most distributions does enable it in startup scripts. Signed-off-by: Jesper Dangaard Brouer diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 691268f..10c944d 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -35,7 +35,7 @@ config IP_ADVANCED_ROUTER at boot time after the /proc file system has been mounted. - If you turn on IP forwarding, you will also get the rp_filter, which + If you turn on IP forwarding, you should consider the rp_filter, which automatically rejects incoming packets if the routing table entry for their source address doesn't match the network interface they're arriving on. This has security advantages because it prevents the @@ -46,9 +46,11 @@ config IP_ADVANCED_ROUTER rp_filter on use: echo 1 > /proc/sys/net/ipv4/conf//rp_filter - or + and echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter + Note that some distributions enable it in startup scripts. + If unsure, say N here. choice