IPv6 Packetloss on Ziggo - IPv4 OK.

[d8472]

Hi all,

I recently set up IPv6 on my Opnsense box going through the Ziggo Connectbox in bridge mode, however are am seeing a lot of random packetloss for extended periods of time.



Meanwhile IPv4 is not showing this at all, apart from the usual 'blips' now and then.

When this happens, IPv6 external connections become unstable and then impossible as it fluctuates around and reaches 100% loss.

Has anyone else experienced this? Is this just Ziggo, or is there something I should check on my end? The fact IPv4 is working fine makes me think it is likely a Ziggo issue but I want to be certain.

Thanks!

[meyergru]

There seem to be tons of problems with that on Ziggo with aftermarket routers, but I do not speak dutch.

[d8472]

Yes these are people having issues with getting any connectivity at all, my issues does appear to be quite different.
The exception I found was someone who has their connection drop after several minutes, however in my case the packetloss will randomly start and increase, then it will rectify itself. There is nothing in my own logs that I can find.

Also I found the following:

- Sometimes the gateway shows as down because dpinger can no longer reach the target, if I ssh into Opnsense then I cannot ping out either. However devices on the LAN can reach out over IPv6.

- Sometimes it is as above but all connectivity is completely lost, including from the LAN

- It will always resolve itself eventually, but there is no apparent pattern.

- It does not seem to occur during the very early hours of the morning.

- Rebooting everything sometimes solves and sometimes does not (it could be it just resolves itself anyway if it is external).

- Nothing is shown being blocked in the firewall

- I took screenshots of the routing tables during the issue and when everything is OK and they are identical.

- I did a traffic sniff on the WAN port during one of the instances where the LAN had connectivity but not the firewall itself, you could see the ping requests and responses from the LAN, and the ping requests but no response on the WAN.

I also did a clean install and reimported my configuration and the issue persists.

So I'm starting to think it is Ziggo, but is there anything else I can check or some logs I have overlooked anyone is aware of? Thanks! 

[jvandenbroek]

Did you manage to fix this? I've set up IPv6 PD and experience the exact same behavior. Sometimes it goes down just for a few sec, other times at least a few minutes. This is old UPC region, which always seem to cause more issues.