Rbr50 ipv6 6rd is broken

Aspirant

Sep 23, 2022

Unfortunately yes it is the only method.
I have tested using
Ping google.com -6

And used wireshark on both pc and from the /debug.htm page on the rbr50.
I can see DNS queries going out and coming back on the wan, but the router responds with ICMP destination unreachable to the incoming packet.
Also on the wan interface I see the outgoing ping packet, the return echo comes back to the wan interface but just never gets back to the lan side and to the pc.

CrimpOn

Guru - Experienced User

Sep 24, 2022

Well, ipv6 was working fine for me, then it was not, and now it is again.

On the IPv6 setup page, I noticed that the ipv6 DNS servers were both "Link Local addresses" (starting with fe80). Having no memory of why that was so, I thought, "I'll just use CloudFlare and Google instead, and changed the setting to this:

Here's what happened:

Original Setting used this DNS server (Link Local address):
fe80:0:fb39:1f6b:f7c3:6db0:0:1

C:\Users\Dick>ping yale.edu -6

Pinging yale.edu [2a04:4e42::645] with 32 bytes of data:
Reply from 2a04:4e42::645: time=18ms
Reply from 2a04:4e42::645: time=10ms
Reply from 2a04:4e42::645: time=11ms
Reply from 2a04:4e42::645: time=16ms

Ping statistics for 2a04:4e42::645:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 10ms, Maximum = 18ms, Average = 13ms

C:\Users\Dick>ping google.com -6

Pinging google.com [2607:f8b0:4007:818::200e] with 32 bytes of data:
Reply from 2607:f8b0:4007:818::200e: time=20ms
Reply from 2607:f8b0:4007:818::200e: time=10ms
Reply from 2607:f8b0:4007:818::200e: time=20ms
Reply from 2607:f8b0:4007:818::200e: time=11ms

Ping statistics for 2607:f8b0:4007:818::200e:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 10ms, Maximum = 20ms, Average = 15ms

C:\Users\Dick>ping google.com -6

Here I changed the DNS servers to CloudFlare and Google:

Pinging google.com [2607:f8b0:4007:80a::200e] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 2607:f8b0:4007:80a::200e:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\Dick>ping -6 yale.edu

Pinging yale.edu [2a04:4e42::645] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 2a04:4e42::645:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Frustrated now, I stewed around and then tried some more:

C:\Users\Dick>ping -6 harvard.edu

Pinging harvard.edu [2a04:4e42:600::645] with 32 bytes of data:
Reply from 2a04:4e42:600::645: time=10ms
Reply from 2a04:4e42:600::645: time=11ms
Reply from 2a04:4e42:600::645: time=16ms
Reply from 2a04:4e42:600::645: time=10ms

Ping statistics for 2a04:4e42:600::645:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 10ms, Maximum = 16ms, Average = 11ms

C:\Users\Dick>ping -6 yale.edu

Pinging yale.edu [2a04:4e42:200::645] with 32 bytes of data:
Reply from 2a04:4e42:200::645: time=20ms
Reply from 2a04:4e42:200::645: time=11ms
Reply from 2a04:4e42:200::645: time=19ms
Reply from 2a04:4e42:200::645: time=10ms

Ping statistics for 2a04:4e42:200::645:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 10ms, Maximum = 20ms, Average = 15ms

This means:

That IPv6 is touchy?
That on my system IPv6 seems to be working (with Spectrum DHCP)

Jaiter
Aspirant
Sep 24, 2022
The frustrating thing for me is that I can see the ICMP 6 ping packets entering the router, the outbound ping to the internet, the return ping from Google servers and then it just disappears inside the orbi.
Is there a way to get SSH Access to the router, it's only embedded Linux after all and would massively help with debugging....

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