Date: Sun, 21 Jan 2007 02:07:41 +0900 (JST) From: Hiroki Sato <hrs@FreeBSD.org> To: bmah@FreeBSD.org Cc: freebsd-net@FreeBSD.org, freebsd-stable@FreeBSD.org, jhay@FreeBSD.org Subject: Re: IPv6 over gif(4) broken in 6.2-RELEASE? Message-ID: <20070121.020741.59649277.hrs@allbsd.org> In-Reply-To: <20070120162936.GA18104@tomcat.kitchenlab.org> References: <20070120162936.GA18104@tomcat.kitchenlab.org>
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----Security_Multipart(Sun_Jan_21_02_07_41_2007_727)-- Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit "Bruce A. Mah" <bmah@freebsd.org> wrote in <20070120162936.GA18104@tomcat.kitchenlab.org>: bm> I'm observing a problem with IPv6 over gif(4) tunnels on 6.2-RELEASE bm> and recent 6-STABLE, namely that I can't seem to be able to pass bm> traffic over them. bm> bm> Essentially, when I configure a gif interface like this: bm> bm> # ifconfig gif0 inet6 aaaa:bbbb:cccc:dddd::1 aaaa:bbbb:cccc:dddd::2 prefixlen 128 bm> bm> the interface should add a host route to aaaa:bbbb:cccc:dddd::2 bm> through gif0. This is necessary to be able to pass traffic over the bm> tunnel, particularly since the source and destination addresses of the bm> link don't need to have any relationship to each other. bm> bm> However, this route doesn't get installed on recent 6-STABLE. bm> Therefore there is no way to get an IPv6 packet to the other end of bm> the tunnel because there's no route for the destination. The most bm> obvious symptom is that I try to ping the other tunnel endpoint and bm> get: bm> bm> ping6: UDP connect: No route to host bm> bm> I know this worked on RELENG_6 as of June 2006; my home firewall has bm> been running this code for months without a hitch. It doesn't work in bm> 6.2-RC2 or 6.2-RELEASE (fresh CD installs on i386, GENERIC kernels), bm> or this week's RELENG_6 (nanobsd on i386). bm> bm> I somewhat suspect revs. 1.48.2.15 and 1.48.2.14 to bm> src/sys/netinet/nd6.c. If I locally revert these two changes (see bm> diff below), IPv6 over gif(4) works again. bm> bm> There's another workaround for people stuck in this situation and who bm> aren't in a position to try this diff. That is to manually install bm> the host route like this: bm> bm> # route add -host -inet6 aaaa:bbbb:cccc:dddd::2 -interface gif0 -nostatic -llinfo bm> bm> Comments? I remember Dimitry Andric reported the same problem on -stable on 30 Dec, and after he reverted rev.1.48.2.16 it worked fine again. Do you have the symptom even on 6.2-RELEASE? Since RELENG_6_2_0_RELEASE did not have the change, I thought there was no problem. I will try to reproduce it on my box anyway... -- | Hiroki SATO ----Security_Multipart(Sun_Jan_21_02_07_41_2007_727)-- Content-Type: application/pgp-signature Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQBFskxdTyzT2CeTzy0RAn2QAJ45Sd5OYGBETxENyUXj/Ax2blKshwCghGtA lDubmL3WryAv3NBDxUNoxnI= =i5Ij -----END PGP SIGNATURE----- ----Security_Multipart(Sun_Jan_21_02_07_41_2007_727)----
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