I made some headway in figuring this out. One thing I did not understand was T1 and T2 time and so was looking at the logs at the vltime hour mark. The proper place to be looking for the first error was at the T1 mark when the renew operation takes place. At this point the following happens in the logs:
A Date XX:XX:XX machine_name dhcp6c[31722]: update_address: update an address XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX pltime=86400, vltime=86400 A Date XX:XX:XX machine_name dhcp6c[31722]: ifaddrconf: failed to add an address on WAN_interface: File exists A Date XX:XX:XX machine_name dhcp6c[31722]: update_ia: failed to update an address XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX A Date XX:XX:XX machine_name dhcp6c[31722]: dhcp6_remove_event: removing an event on WAN_interface, state=RENEW I went through the source code to try to trace this out and I came up with the system call to change the IP address fails and this causes the code to update the refresh timer to not execute as it executes after this call except in the case where the former operation fails, then it gets skipped. Once vltime for the WAN interface is reached the WAN interface expires and requests a new address, but the internal interfaces don't request such an update. I believe it is at this point of the WAN interface expiring and re-initing where Cox's server drops the route for the internal subnets. Specifically: 1. In dhcp6c_ia.c line 166 - Calls update_address() 2. In addrconf.c line 177 - Call to na_ifaddrconf() is made. This fails and returns before executing timer code below. 3. In addrconf.c line 396 - ifaddrconf() is made. 4. In common.c line 3398 - System call is made to add /128 IP address issued by DHCPv6 server and fails because the address has not expired yet. At least if I understand correctly. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1559741 Title: wide-dhcpv6 client apparently sets incorrect PD specfic vltime To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/wide-dhcpv6/+bug/1559741/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
