0

This all started when I changed modems, which also necessitated changing WAN interfaces on my custom router (1G to 2.5G). The first time I changed the interface, I stopped getting a delegated prefix and started seeing 'NoPrefixAvail' or 'No prefix available on Link' in Wireshark. The second time I tried changing interfaces, for testing purposes, I started getting 'NoAddrAvail' or 'No address available on Link'. I now have no IPv6 connectivity whatsoever, whereas everything worked fine before switching interfaces.

These errors suggest that the problem is on my ISP's side, however, when I switch back to my old off-the-shelf router, I do get an address and prefix.

About my router: I am using Ubuntu Server, with firewalld as a firewall. I request a prefix through systemd as per https://erik.nygren.org/dhcpv6-pd-on-ubuntu-2204.html by adding /etc/systemd/network/10-netplan-enp4s0.network.d/override.conf (where enp4s0 is the WAN interface) containing the following:

[Match]

Name=enp4s0


[DHCPv6]

PrefixDelegationHint=::/60

This setup worked perfectly for the previous interface, but not for the new ones.

Wireshark caps for 'dhcpv6' are here.

Improve this question
1
  • Could it be you have to register the MAC of your new router with your ISP ? Or you could try cloning your old MAC on your new router if the device allows it.
    – Silbee
    Commented Oct 30, 2023 at 11:38

1 Answer 1

Reset to default
0

Although it's an unsatisfying solution, the problem appears to have resolved itself. I randomly ended up with an address and prefix last night.

Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .