Access • IPv6 NoPrefixAvail

I just got Sonic a couple of weeks ago. It's been working great. However, I recently swapped out my router with a newer, faster one, and now I cannot seem to get an IPv6 prefix. It's been roughly 48 hours thus far, so I think it should have been long enough for any existing leases to time out. I tried a couple of things, including changing the DUID and adding and removing various DHCP client options, with no change.

The router is running openwrt with odhcp6c as the client.

I did notice that if I configure the client to request an NA, I get a single /128 address, but I cannot seem to get a PD. For reference, the router was requesting both the NA and the PD in a single Solicit message.

Tcpdump on the router shows the following:

22:59:07.308572 IP6 (flowlabel 0x91dbf, hlim 1, next-header UDP (17) payload length: 105) fe80::9683:c4ff:fea8:a822.546 > ff02::1:2.547: [bad udp cksum 0x0050 -> 0xeba3!] dhcp6 solicit (xid=cacdfa (elapsed-time 762) (option-request SIP-servers-domain SIP-servers-address DNS-server DNS-search-list SNTP-servers NTP-server AFTR-Name opt_67 opt_94 opt_95 opt_96 opt_82) (client-ID hwaddr type 1 9483c4a8a822) (IA_PD IAID:1 T1:0 T2:0 (IA_PD-prefix ::/56 pltime:0 vltime:0)))

22:59:11.885247 IP6 (class 0xc0, hlim 64, next-header UDP (17) payload length: 173) fe80::e65dfe89:77f4.547 > fe80::9683:c4ff:fea8:a822.546: [udp sum ok] dhcp6 advertise (xid=cacdfa (client-ID hwaddr type 1 9483c4a8a822) (server-ID vid 0000058365343a35) (IA_PD IAID:1 T1:0 T2:0 (IA_PD-prefix ::/128 pltime:0 vltime:0 (status-code NoPrefixAvail))) (DNS-server 2001:5a8::11 2001:5a8::33))

Statistics: Posted by igorizyumin — Thu Jan 30, 2025 11:08 pm

---