Dear List, I've just replaced a multi-homed Fedora Linux system with Gentoo, and upgraded the kernel to 2.6.15 in the process. I am now encountering weird link-local problems, and am turning to you in hopes of solving it.
This system has three NICs, one of which is connected to my IPv4-only ISP and running a 6to4 tunnel. The other two have statically assigned 6to4 subnets: 2002:52b6:8514:100::/64 and 2002:52b6:8514:200::/64. I'm running radvd in order to route properly between all subnets. Ever since I upgraded, link-local IPv6 packets are only being sent to the 2002:52b6:8514:100:: subnet, and none at all to the 2002:52b6:8514:200:: one. When I say none, I really mean none, including neighbor solicitations, neighbor advertisements and router advertisements from radvd. This makes that subnet completely disconnected from IPv6. It seems that the kernel simply refuses link-local packets on any interface but the one serving 2002:52b6:8514:100:: (there doesn't appear to be a hardware error or anything), but I have no idea why. FYI, the names of the interfaces are "wan" (IPv4-only ISP), "srv" (2002:52b6:8514:100::/64) and "int" (2002:52b6:8514:200::/64). I'm using ifrename to get consistent names instead of ethX. For example, when I strace'd radvd, I got this when it tries to send a RA over the "int" interface: sendmsg(4, {msg_name(28)={sa_family=AF_INET6, sin6_port=htons(58), inet_pton(AF_INET6, "ff02::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=if_nametoindex("int")}, msg_iov(1)=[{"[EMAIL PROTECTED] [EMAIL PROTECTED]'\215\0\0"..., 56}], msg_controllen=32, {cmsg_len=32, cmsg_level=SOL_IPV6, cmsg_type=, ...}, msg_flags=MSG_OOB| MSG_PEEK|MSG_PROXY|MSG_TRUNC|MSG_ERRQUEUE|MSG_DONTWAIT|MSG_FIN| MSG_RST|MSG_NOSIGNAL|0x2f760000}, 0) = -1 EINVAL (Invalid argument) In contrast, when it attempts to send over the "srv" interface: sendmsg(4, {msg_name(28)={sa_family=AF_INET6, sin6_port=htons(58), inet_pton(AF_INET6, "ff02::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=if_nametoindex("srv")}, msg_iov(1)=[{"[EMAIL PROTECTED] [EMAIL PROTECTED]'\215\0\0"..., 56}], msg_controllen=32, {cmsg_len=32, cmsg_level=SOL_IPV6, cmsg_type=, ...}, msg_flags=0}, 0) = 56 I don't know why msg_flags differs between the two, but I doubt that to be the cause of the problems, since the kernel refuses to transmit its own internally generated neighbor solicitations and such as well. Also, this happens when I try to ping6 link-local addresses: pc17 ~ # ping6 -I srv fe80::dead:cafe PING fe80::dead:cafe(fe80::dead:cafe) from fe80::2a0:c9ff:fed1:7099 srv: 56 data bytes --- fe80::dead:cafe ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1012ms pc17 ~ # ping6 -I int fe80::dead:cafe connect: Cannot assign requested address pc17 ~ # ping6 -I wan fe80::dead:cafe connect: Cannot assign requested address I'm not sure what information would be useful to solve this, so I'll just send along the standard interface information below. Thank you for your time! Fredrik Tolf --- pc17 ~ # ip link 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: sit0: <NOARP> mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0 3: wan: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:c0:26:c0:33:05 brd ff:ff:ff:ff:ff:ff 4: srv: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:a0:c9:d1:70:99 brd ff:ff:ff:ff:ff:ff 5: int: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:02:44:15:f9:8b brd ff:ff:ff:ff:ff:ff 6: [EMAIL PROTECTED]: <NOARP,UP> mtu 1480 qdisc noqueue link/sit 82.182.133.20 brd 0.0.0.0 pc17 ~ # ip -6 addr 1: lo: <LOOPBACK,UP> mtu 16436 inet6 ::1/128 scope host valid_lft forever preferred_lft forever 3: wan: <BROADCAST,MULTICAST,UP> mtu 1500 qlen 1000 inet6 fe80::2c0:26ff:fec0:3305/64 scope link tentative valid_lft forever preferred_lft forever 4: srv: <BROADCAST,MULTICAST,UP> mtu 1500 qlen 1000 inet6 fe80::2a0:c9ff:fed1:7099/64 scope link valid_lft forever preferred_lft forever inet6 2002:52b6:8514:100::1/64 scope global valid_lft forever preferred_lft forever 5: int: <BROADCAST,MULTICAST,UP> mtu 1500 qlen 1000 inet6 2002:52b6:8514:200::1/64 scope global tentative valid_lft forever preferred_lft forever inet6 fe80::202:44ff:fe15:f98b/64 scope link tentative valid_lft forever preferred_lft forever 6: [EMAIL PROTECTED]: <NOARP,UP> mtu 1480 inet6 2002:52b6:8514::1/16 scope global valid_lft forever preferred_lft forever inet6 ::82.182.133.20/128 scope global valid_lft forever preferred_lft forever pc17 ~ # ip -6 route ::/96 via :: dev 6tun metric 256 expires 21331099sec mtu 1480 advmss 1420 metric 10 4294967295 2002:52b6:8514:100::/64 dev srv metric 256 expires 21331168sec mtu 1500 advmss 1440 metric 10 4294967295 2002:52b6:8514:200::/64 dev int metric 256 expires 21331102sec mtu 1500 advmss 1440 metric 10 4294967295 2002::/16 dev 6tun metric 256 expires 21331099sec mtu 1480 advmss 1420 metric 10 4294967295 2000::/3 via ::192.88.99.1 dev 6tun metric 1024 expires 21331099sec mtu 1480 advmss 1420 metric 10 4294967295 fe80::/64 dev 6tun metric 256 expires 21331099sec mtu 1480 advmss 1420 metric 10 4294967295 fe80::/64 dev int metric 256 expires 21331102sec mtu 1500 advmss 1440 metric 10 4294967295 fe80::/64 dev wan metric 256 expires 21331107sec mtu 1500 advmss 1440 metric 10 4294967295 fe80::/64 dev srv metric 256 expires 21331168sec mtu 1500 advmss 1440 metric 10 4294967295 ff00::/8 dev 6tun metric 256 expires 21331099sec mtu 1480 advmss 1420 metric 10 4294967295 ff00::/8 dev int metric 256 expires 21331102sec mtu 1500 advmss 1440 metric 10 4294967295 ff00::/8 dev wan metric 256 expires 21331107sec mtu 1500 advmss 1440 metric 10 4294967295 ff00::/8 dev srv metric 256 expires 21331168sec mtu 1500 advmss 1440 metric 10 4294967295 unreachable default dev lo proto none metric -1 error -101 metric 10 255 pc17 ~ # ip -6 maddr 1: lo inet6 ff02::1 3: wan inet6 ff02::1:ff00:0 inet6 ff02::2 inet6 ff02::1:ffc0:3305 inet6 ff02::1 4: srv inet6 ff02::1:ff00:0 users 2 inet6 ff02::2 users 2 inet6 ff02::1:ffd1:7099 inet6 ff02::1:ff00:1 inet6 ff02::1 5: int inet6 ff02::1:ff00:0 users 2 inet6 ff02::2 users 2 inet6 ff02::1:ff00:1 inet6 ff02::1:ff15:f98b inet6 ff02::1 6: 6tun inet6 ff02::1 --------------------------------------------------------------------- The IPv6 Users Mailing List Unsubscribe by sending "unsubscribe users" to [EMAIL PROTECTED]