From owner-freebsd-net@FreeBSD.ORG Sun Dec 28 03:27:26 2014 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 055ADC67 for ; Sun, 28 Dec 2014 03:27:26 +0000 (UTC) Received: from omicron.logn.net (omicron.logn.net [72.10.118.7]) by mx1.freebsd.org (Postfix) with ESMTP id D88BB6455C for ; Sun, 28 Dec 2014 03:27:25 +0000 (UTC) Received: from [10.3.73.86] (unknown [10.3.73.86]) by omicron.logn.net (Postfix) with ESMTPSA id 0C5004A0082 for ; Sat, 27 Dec 2014 22:19:42 -0500 (EST) From: Jason Healy Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Subject: IPv6 routes leaking between FIBs? Message-Id: Date: Sat, 27 Dec 2014 22:19:42 -0500 To: freebsd-net@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) X-Mailer: Apple Mail (2.1878.6) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Dec 2014 03:27:26 -0000 Hello, Trying out FreeBSD for the first time to build a firewall box that=92s = multi-core and runs PF. I=92m very interested in the FIB code, as it = lines up well with the way my core networking equipment works and should = allow me to route traffic on an interface that=92s logically separate = from the management interfaces. I=92ve been playing for a bit with the FIB features, but I=92m getting = hung up on IPv6. I=92m trying to set up two interfaces on my box to = each have a different FIB, and to not leak routes between the = interfaces: # sysctl net.add_addr_allfibs=3D0 # ifconfig em1 inet 192.0.2.1/24 fib 1 # ifconfig em1 inet6 2001:db8:dead:beef::1/64 fib 1 # ifconfig em2 inet 203.0.113.1/24 fib 2 # ifconfig em2 inet6 2001:db8:cafe:babe::1/64 fib 2 If I then check the routing tables for each FIB, here=92s what I get: # setfib -F 1 netstat -rn Routing tables (fib: 1) Internet: Destination Gateway Flags Netif Expire 192.0.2.0/24 link#2 U em1 192.0.2.1 link#2 UHS lo0 Internet6: Destination Gateway Flags = Netif Expire 2001:db8:cafe:babe::/64 link#3 U = em2 2001:db8:dead:beef::/64 link#2 U = em1 2001:db8:dead:beef::1 link#2 UHS = lo0 fe80::%em1/64 link#2 U = em1 fe80::a00:27ff:fef6:162a%em1 link#2 UHS = lo0 fe80::%em2/64 link#3 U = em2 fe80::%lo0/64 link#5 U = lo0 # setfib -F 2 netstat -rn Routing tables (fib: 2) Internet: Destination Gateway Flags Netif Expire 203.0.113.0/24 link#3 U em2 203.0.113.1 link#3 UHS lo0 Internet6: Destination Gateway Flags = Netif Expire 2001:db8:cafe:babe::/64 link#3 U = em2 2001:db8:cafe:babe::1 link#3 UHS = lo0 2001:db8:dead:beef::/64 link#2 U = em1 fe80::%em1/64 link#2 U = em1 fe80::%em2/64 link#3 U = em2 fe80::a00:27ff:fe62:d267%em2 link#3 UHS = lo0 fe80::%lo0/64 link#5 U = lo0 Note that as expected, the IPv4 routes are constrained to their FIB = (192.0.2.0 to FIB 1 and 203.0.113.0 to FIB 2). However, the IPv6 routes = (deadbeef and cafebabe) leak between the FIBs; both prefixes that I add = are listed in both FIBs (as well as the link-local stuff). According to: = https://www.freebsd.org/news/status/report-2012-01-2012-03.html#Multi-FIB:= -IPv6-Support-and-Other-Enhancements IPv6 parity is claimed for the FIB code, so I=92m not sure if I=92m = doing it wrong, or if there=92s a problem with the FIB code and IPv6 = routes. Thanks in advance for any help or clarification! Jason=