"Bruce A. Mah" <[EMAIL PROTECTED]> wrote in <[EMAIL PROTECTED]>:
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
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