[OpenWrt-Devel] [PATCHv3 openwrt 1/2] Revert "kernel: disable multicast-to-unicast translation for ipv6 neighbor solicitation (#17625)"

Steven Barth cyrus at openwrt.org
Sat Aug 29 10:21:50 EDT 2015

Hi Linus,

one of these two kernel patches break IPv6 over WiFi completely.

https://dev.openwrt.org/changeset/46719 works
https://dev.openwrt.org/changeset/46723 is broken with default settings,
but works when setting option igmp_snooping 0.

symptoms are:
"IPv6: wlan0: IPv6 duplicate address fe80::[...] detected!"
in the client's kernel log when connecting using WiFi.

Connecting through Ethernet (bridged to said WiFi) works as expected
though. Since the link-local is marked as dadfailed over WiFi,
IPv6 connectivity is completely broken, obviously the DAD failed
is a false positive.

Router is ar71xx / ath9k.
Client is iwlwfi.

Let me know if you need more info.


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