From owner-freebsd-bugs@FreeBSD.ORG Mon Jun 26 10:40:30 2006 Return-Path: X-Original-To: freebsd-bugs@hub.freebsd.org Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E198416A5D3 for ; Mon, 26 Jun 2006 10:40:30 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 387FC43D62 for ; Mon, 26 Jun 2006 10:40:29 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k5QAeSKC040103 for ; Mon, 26 Jun 2006 10:40:28 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k5QAeSPB040099; Mon, 26 Jun 2006 10:40:28 GMT (envelope-from gnats) Resent-Date: Mon, 26 Jun 2006 10:40:28 GMT Resent-Message-Id: <200606261040.k5QAeSPB040099@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Colin Petrie Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 186C116A400 for ; Mon, 26 Jun 2006 10:39:06 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id D5113444A8 for ; Mon, 26 Jun 2006 10:39:05 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id k5QAd5of024757 for ; Mon, 26 Jun 2006 10:39:05 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id k5QAd5jB024756; Mon, 26 Jun 2006 10:39:05 GMT (envelope-from nobody) Message-Id: <200606261039.k5QAd5jB024756@www.freebsd.org> Date: Mon, 26 Jun 2006 10:39:05 GMT From: Colin Petrie To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-2.3 Cc: Subject: kern/99484: enabling net.inet.ip.fastforwarding breaks rfc2644 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Jun 2006 10:40:31 -0000 >Number: 99484 >Category: kern >Synopsis: enabling net.inet.ip.fastforwarding breaks rfc2644 >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Jun 26 10:40:28 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Colin Petrie >Release: 6.1-RELEASE >Organization: >Environment: FreeBSD xxxxxxxx 6.1-RELEASE FreeBSD 6.1-RELEASE #1: Mon May 15 12:15:49 BST 2006 root@xxxxxxxx:/usr/src/sys/i386/compile/ROUTER i386 >Description: When net.inet.ip.fastforwarding=1, FreeBSD 6.1-RELEASE will forward packets to network prefix broadcast addresses. This is in violation of RFC2644 (Changing the Default for Directed Broadcasts in Routers) (while ping'ing 217.8.240.255) # sysctl net.inet.ip.fastforwarding=1 # tcpdump -qnei vlan200 ether broadcast and icmp 11:28:37.473427 00:30:48:84:ff:b1 > ff:ff:ff:ff:ff:ff, IPv4, length 154: 217.133.19.77 > 217.8.240.255: ICMP echo request, id 3408, seq 0, length 120 11:28:38.569223 00:30:48:84:ff:b1 > ff:ff:ff:ff:ff:ff, IPv4, length 154: 217.133.19.77 > 217.8.240.255: ICMP echo request, id 3408, seq 0, length 120 # sysctl net.inet.ip.fastforwarding=0 # tcpdump -qnei vlan200 ether broadcast and icmp (no packets returned) >How-To-Repeat: sysctl net.inet.ip.fastforwarding=1 Then ping the broadcast address on a LAN from a host on a different subnet >Fix: sysctl net.inet.ip.fastforwarding=0 >Release-Note: >Audit-Trail: >Unformatted: