Messages in this thread | | | From | valdis.kletnieks@vt ... | Subject | 4.14.(44->48) IPv6 RA issue? | Date | Mon, 18 Jun 2018 11:02:46 -0400 |
| |
So I'm trying to troubleshoot an issue on an OpenWRT/Lede based router, where IPv6 connectivity totally fails. I've bisected it down to:
git log --oneline 187da94808a634477b5e5a69109ea0c566dfa64b..73d8a6ab7668173d70adbed45b61be5256c505e 73d8a6ab7668 (refs/bisect/bad) base-files: fix UCI config parsing and callback handling e52f3e9b1376 kernel: bump 4.14 to 4.14.48 7590c3c58f5e (HEAD) scripts: Replace obsolete POSIX tmpnam in slugimage.pl with File::Temp function 987900f2de76 hostapd: properly build hostapd-only SSL variants
and am pretty sure that it's the kernel bump (works with a 4.14.44 kernel, breaks with 4.14.48) as the other 3 commits don't go anywhere near IPv6 handling.
Symptoms: With a good kernel, 'ip -6 neigh' reports:
ip -6 neigh 2601:5c0:c001:4341:2116:22ff:b17b:7cd6 dev wlan1 lladdr bc:85:56:1f:4f:6d REACHABLE fe80::201:5cff:fe6f:1a46 dev eth1 lladdr 00:01:5c:6f:1a:46 router REACHABLE fe80::9325:3b21:5021:fbd8 dev eth0 lladdr b8:27:eb:f7:0b:20 REACHABLE fe80::2d9:d1ff:fed9:51a3 dev eth0 lladdr 00:d9:d1:d9:51:a3 REACHABLE
With a bad one, I get:
ip -6 neigh fe80::be85:56ff:fe1f:4f6d dev wlan1 lladdr bc:85:56:1f:4f:6d STALE fe80::2d9:d1ff:fed9:51a3 dev eth0 lladdr 00:d9:d1:d9:51:a3 STALE fe80::9325:3b21:5021:fbd8 dev eth0 lladdr b8:27:eb:f7:0b:20 DELAY 2601:5c0:c001:4341:2116:22ff:b17b:7cd6 dev wlan1 lladdr bc:85:56:1f:4f:6d REACHABLE fe80::201:5cff:fe6f:1a46 dev eth1 INCOMPLETE
Note that eth1 is the uplink towards my ISP. I've pointed a 'tcpdump -n -i eth1 ip6' at it, and see plenty of RA packets come in, but neighbor discovery never completes. Looking at the Changelogs for .45->.50 don't show any smoking-gun patches.
This ring any bells, before I delve deeper into it? [unhandled content-type:application/pgp-signature] | |