#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):
I double checked challenger and confirmed that there are no iptables rules
(I don't think the module was even loaded until I typed the command). I
also checked /etc/hosts.allow and /etc/hosts.deny and didn't see anything
in there.
I ran tcpdump on the challenger system and found no SSH packets were
received on the eth0 interface when I get connection refused.
The output is a bit different once I've gotten connection refused:
{{{
13:11:31.430470 IP6 2604:2000:1280:a089:5e51:4fff:fead:5246.50420 >
challenger.ssh: Flags [S], seq 3610756443, win 28800, options [mss
1440,sackOK,TS val 236674824 ecr 0,nop,wscale 7], length 0
13:11:31.430520 IP6 challenger.ssh >
2604:2000:1280:a089:5e51:4fff:fead:5246.50420: Flags [S.], seq 3575874884,
ack 3610756444, win 28560, options [mss 1440,sackOK,TS val 25167902 ecr
236674824,nop,wscale 7], length 0
13:11:31.430748 IP6 fe80::c43d:c7ff:fe9b:46fc > challenger: ICMP6,
redirect, 2604:2000:1280:a089:5e51:4fff:fead:5246 to
2604:2000:1280:a089:5e51:4fff:fead:5246, length 136
13:11:31.430765 IP6 2604:2000:1280:a089:5e51:4fff:fead:5246.50420 >
challenger.ssh: Flags [R], seq 3610756444, win 0, length 0
13:11:32.337759 IP challenger.60949 > brooklyn.matthoran.com.domain:
15418+ PTR?
6.4.2.5.d.a.e.f.f.f.f.4.1.5.e.5.9.8.0.a.0.8.2.1.0.0.0.2.4.0.6.2.ip6.arpa.
(90)
13:11:32.429101 IP6 2604:2000:1280:a089:5e51:4fff:fead:5246.50420 >
challenger.ssh: Flags [S], seq 3610756443, win 28800, options [mss
1440,sackOK,TS val 236675074 ecr 0,nop,wscale 7], length 0
13:11:32.429120 IP6 challenger.ssh >
2604:2000:1280:a089:5e51:4fff:fead:5246.50420: Flags [S.], seq 3591478356,
ack 3610756444, win 28560, options [mss 1440,sackOK,TS val 25168152 ecr
236675074,nop,wscale 7], length 0
13:11:32.429353 IP6 fe80::c43d:c7ff:fe9b:46fc > challenger: ICMP6,
redirect, 2604:2000:1280:a089:5e51:4fff:fead:5246 to
2604:2000:1280:a089:5e51:4fff:fead:5246, length 136
13:11:32.429369 IP6 2604:2000:1280:a089:5e51:4fff:fead:5246.50420 >
challenger.ssh: Flags [R], seq 3610756444, win 0, length 0
}}}
Oddly enough this behavior happens in both directions. If I try to connect
to my laptop via IPv6 from challenger, I see the same behavior. Again, I'm
not aware of any firewall or SSH configuration that may be rejecting
connections, as I'm able to connect fine from the outside world.
--
Ticket URL: <https://dev.openwrt.org/ticket/17396#comment:5>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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