Beware of Verizon FIOS IPv6

networker5

August 19, 2022 20:33

For the last several weeks I've had strange instability in the network. Zoom crash, HBO, Disney, Netflix, Xbox, etc. all crashing, stoping, etc. but with good dl speed. I found many people having problems with FIOS IPv6 and since disabling last night (and flushing DNS cache, restarting all devices to refresh DHCP/DNS) things are looking good! Time will tell but beware of IPv6 if you are troubleshooting.

Ref:

https://www.reddit.com/r/firewalla/comments/vacuva/ipv6_on_lan_causing_hourly_disconnects_for_all/

https://www.reddit.com/r/firewalla/comments/wkyhjx/fios_ipv6/

https://help.firewalla.com/hc/en-us/community/posts/1500000231142-IPV6-Not-Working-on-Firewall-Gold-Router-Mode

Comments

6 comments

Radagast82

September 05, 2022 14:06
I faced a similar issue just a couple of days ago. I'm in Italy, my ISP provides PPPoE connection, with separated stack for ipv4 and ipv6. I used to have both (v4 and v6), even with some "manual" fix concerning the gateway (should be the local ipv6 address). Last friday night I experienced a full outage of the connection. Recreated from scratch the WAN connection on FWG, both ipv4 and ipv6 enabled on WAN and LAN, still problems with regular connection loss on all my devices. I then run a WinMTR session, resulting in high packet loss (from 30% to 50%) in the very first hop (FWG). On ISP side they told me everything works well, and the fact that I'm losing packets on first hop points at my network. I then tried to disable the v6 on wan side and puf! 0% PL, everything went good again. I then decided to reflash the FWG image ubuntu 20.04, and reconfigurate the FWG from scratch (no migration). Now it's ok since 48 hours. Is something you guys @firewalla are looking at?
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Firewalla

September 05, 2022 17:07
Unlikely that your issue is related to the OP. Next time it happens, best to contact us first, so we can look at the logs.
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Radagast82

September 05, 2022 17:11
Yeah, hopefully this won't happen again. I just remember that in the last weeks when i logged in via ssh, some message about memory was there, but i don't remember well. Thanks guys
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Firewalla

September 05, 2022 22:46
Are you running any docker containers? or using your own custom DNS servers?
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Radagast82

September 06, 2022 05:44
Nop, no container no dockers. I just installed nano and speedtest
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Firewalla

September 06, 2022 16:08
if it happens again, please let us know immediately. Usually the logs will be able to pin point the problem very easily
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