#17396: LAN clients unable to communicate via IPv6 while Internet connectivity
works
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Reporter: mhoran | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: base system | Version: Barrier Breaker 14.07
Resolution: | Keywords:
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Comment (by mhoran):
Replying to [comment:6 cyrus]:
> OK judging from that dump, challenger has a problem with its neighbor-
discovery and or routing. The return packets to
2604:2000:1280:a089:5e51:4fff:fead:5246 should be sent to the MAC-address
ending with ...:ad:52:46 however challenger sents the return packets to
...:9b:46:fc. If the latter happens to be the OpenWrt router than
challenger might be missing an on-link route for its prefix. You should
probably check challenger's routing table if it has entries for
2604:2000:1280:a089::/64 and what they look like.
9b:46:fc is indeed the router (eth0.1).
> Add: You can see that by the ICMP6 redirects sent by :9b:46:fc that
redirect 2604:2000:1280:a089:5e51:4fff:fead:5246 to
2604:2000:1280:a089:5e51:4fff:fead:5246 meaning challenger should directly
send to 2604:2000:1280:a089:5e51:4fff:fead:5246 and not use the router.
I thought the ICMP6 redirects were weird. Though I'm less familiar with
IPv6 than I am with IPv4, I assumed a host would still try to communicate
with its subnet directly. That seems not to be the case in my situation.
The eth0 interface on challenger shows the following:
{{{
inet6 addr: 2604:2000:1280:a089:82ee:73ff:fe12:71cf/64
Scope:Global
}}}
The wlan0 interface on mhoran-x1-carbon shows the following:
{{{
inet6 addr: 2604:2000:1280:a089:5e51:4fff:fead:5246/64
Scope:Global
}}}
I also tried changing ra_management back to 1 to enable DHCPv6 address
assignment. Unfortunately that didn't solve the problem.
Here is the output of /sbin/ip -6 route
{{{
2604:2000:1280:a089::/64 via fe80::c43d:c7ff:fe9b:46fc dev wlan0 proto ra
metric 10
fe80::/64 dev wlan0 proto kernel metric 256
default via fe80::c43d:c7ff:fe9b:46fc dev wlan0 proto static metric 1024
}}}
Is the router associated with the 2604:2000:1280:a089::/64 subnet the
cause of the problem?
--
Ticket URL: <https://dev.openwrt.org/ticket/17396#comment:7>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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