clients loosing ipv6 internet now and then

[cloudz]

It seems someone found the reason :

https://github.com/opnsense/core/issues/7795

[sjm]

Well uh, I was able to observe similar looking behaviour.

Code Select Expand



root@opns:~ # tcpdump -n -nn -i vlan0.18 'icmp6 and not ip6[40] == 128 and not ip6[40] == 129'
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on vlan0.18, link-type EN10MB (Ethernet), snapshot length 262144 bytes
20:53:32.931734 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:34.002399 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:35.042986 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:38.957928 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:40.002543 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:41.052590 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:42.259048 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:43.282588 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:44.322688 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:46.333740 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:47.362818 IP6 fe80::1afd:74ff:fec1:2acd > ff02::1:ff65:3a25: ICMP6, neighbor solicitation, who has 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32
20:53:47.362850 IP6 fe80::xxxx:yyyy:zzzz:3a25 > fe80::1afd:74ff:fec1:2acd: ICMP6, neighbor advertisement, tgt is 2a0b:5c81:10:0:xxxx:yyyy:zzzz:3a25, length 32


BR, -sjm

[franco]

Is this due to the pf FreeBSD SA ICMP issue too?

You can review the 24.7.2 kernel:

# opnsense-update -kr 24.7.2

(requires a reboot(


Cheers,
Franco

[cloudz]

Just installed & rebooted. Looks good so far.

[franco]

Ok, 24.7.2 is due tomorrow. Let's wait and see in this case :)

[dMopp]

I will test my issue as well. Maybe related, maybe not. Will report then :)

[cloudz]

@Franco : Cried victory too fast. Still the same erratic behaviour. I've turned off IPv6 for now.

[franco]

Maybe another upstream oddity. I can put it on a list of things to dig through -.-

[cloudz]

Thanks, much appreciated.

[gogolathome]

I am not using OPNsense Quality graph because I see similar behavior on my connection for a long time now(dpinger). I test my connection with smokeping. Maybe you can use that also for testing IPv6?

[Wirehead]

@Franco : Cried victory too fast. Still the same erratic behaviour. I've turned off IPv6 for now.

I see you're using Telenet. I see similar behavior on Telenet, but not on Proximus. Telenet also seemingly issues with Youtube etc (see the news..) - Could be the provider. I'll test "opnsense-update -kr 24.7.2" as well.

[cloudz]

But it's not happening on 24.7 and before. I do see very high pings towards Google -- so that's a routing issue. These pings are to the modem/ipv6 bridge itself.

[franco]

It could still be repercussions of https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280701 introduced in 24.7.1 but I have absolutely no idea what the plan there is after the SA breaking it and then adding a few small patches on top that seem to fix the most apparent issues (included in 24.7.2), but perhaps not all of them.


Cheers,
Franco

[franco]

Just to be sure have you tried reverting to 24.7 kernel instead?


Cheers,
Franco

[cloudz]

Yes -- I went to the 24.7 kernel and that caused the drops to disappear but sometimes high spikes in CPU / interrupts which caused issues on IPv4 instead. But I did it with opnsense-revert & the update to the old kernel so might have caused some inconsistencies there.