From boot, ipv6 leases are mostly assigned with leases of 1 hour. Occasionally leases of 14 days (as specified in Static Leases), and occasionally leases of 30 minutes and occasionally no leases (or leases expire and are not renewed).
What debugging / logging steps can I take to better pin down this issue?
I suspect that this is related to, or causes, occasional long stalls when opening new web pages, reported at [[https://forum.openwrt.org/t/frequent-stalls-on-21-02-rc3-possible-cause-is-dhcpv6/99761|the OpenWRT forum]]
In an initial effort to debug, I stopped odhcp and then started it on the command line with -l 7. The only logging that looked like a possible error are occasional sequences similar to this: odhcpd: Received 123 Bytes from fe80::215:5dff:fe01:aa0f%lan@br-lan
odhcpd: Got a DHCPv6-request on lan
odhcpd: DHCPV6 REBIND IA_NA from 00020000ab113cca95908581f184 on lan: ok 2401:xxxx:xxxx:7bf7::ffff:253/128 fda6:3ce8:c11::ffff:253/128
odhcpd: Sending a DHCPv6-reply on lan
odhcpd: Sent 172 bytes to fe80::215:5dff:fe01:aa0f%lan@br-lan
BusyBox v1.33.1 (2021-06-13 22:02:19 UTC) multi-call binary.
Usage: basename FILE [SUFFIX]
Strip directory path and .SUFFIX from FILE
odhcpd: Netlink newneigh 2401:xxxx:xxxx:7bf7::aaaa:aaaa on lan
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