I am unfortunately having to use an RV340W router for a time, and am trying to get IPv6 prefix delegation working on Comcast. This was working flawlessly for years with a Ubiquiti EdgeRouter device up until 2 days ago when I installed the Cisco, so I know there isn't any problem with Comcast or the connection.
The problem is that every ~10-20 IPv6 packets are dropped. This is what a continuous IPv6 ping looks like from a Linux machine connected directly to the ethernet ports:
[user@Linux-RPi ~]$ ping gmail.com PING gmail.com(iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005)) 56 data bytes 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=1 ttl=108 time=29.4 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=2 ttl=108 time=34.7 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=3 ttl=108 time=31.2 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=4 ttl=108 time=34.7 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=5 ttl=108 time=32.4 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=6 ttl=108 time=28.9 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=7 ttl=108 time=36.8 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=8 ttl=108 time=28.9 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=9 ttl=108 time=29.0 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=10 ttl=108 time=29.0 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=11 ttl=108 time=28.8 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=12 ttl=108 time=29.9 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=13 ttl=108 time=29.3 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=14 ttl=108 time=32.1 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=15 ttl=108 time=28.9 ms ping: sendmsg: Network is unreachable 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=17 ttl=108 time=30.0 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=18 ttl=108 time=29.4 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=19 ttl=108 time=29.1 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=20 ttl=108 time=29.4 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=21 ttl=108 time=29.0 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=22 ttl=108 time=31.4 ms 64 bytes from iad23s60-in-x05.1e100.net (2607:f8b0:4004:808::2005): icmp_seq=23 ttl=108 time=34.0 ms
This happens on every device, wired or wireless, on Apple and Windows devices. It's not just ping; as you browse around the web, every minute or so devices report that the "route to host" is lost. It's entirely random. In practice, it means that web pages frequently fail to load and must be manually reloaded. Video calls frequently complain about not being able to start.
If I disable IPv6 entirely on the router, everything works perfectly.
Here is the LAN config:
Here is the LAN config:
Here is router advertisement config:
Can someone provide some support? Like I said, a Ubiquiti router was running on this same connection for years without a single IPv6 hiccup.
