dhcpcd-discuss

Hi James

On 21/12/2019 16:33, James Gross wrote:
> Hi,
>
> I have two Raspberry Pis running dhcpcd on raspbian buster
> Neither of them can get an IPv6 address.
> My router is a Zxyel VMG3925-B10B
>
> All the other devices on my network seem to be able to get IPv6 addresses
> MacOS
> iPhones
> Mikrotik router as DHCP client
> An old Netgear switch.
>
> Here is the dhcpcd log from one of the Pis
>
> Dec 21 11:22:48 [10971]: eth0: Router Advertisement from fe80::be99:11ff:fe81:6408
> Dec 21 11:22:48 [10971]: eth0: adding address 
> 2001:8b0:de0a:bb0e:ba27:ebff:fe0a:5f6a/64
> Dec 21 11:22:48 [10971]: eth0: pltime 4294967022 seconds, vltime 4294967022 seconds
> Dec 21 11:22:48 [10971]: eth0: expired address 
> 2001:8b0:de0a:bb0e:ba27:ebff:fe0a:5f6a/64
> Dec 21 11:22:48 [10971]: eth0: part of Router Advertisement expired
> Dec 21 11:22:48 [10971]: eth0: deleting route to 2001:8b0:de0a:bb0e::/64
> Dec 21 11:22:48 [10971]: eth0: executing `/lib/dhcpcd/dhcpcd-run-hooks' ROUTERADVERT

OK, so here's the technical reason.
Your RA times of 4294967022 are bigger than what the time_t of a 32-bit OS can 
handle.

If that address was recevied at epoch (epoch is 1970/01/01) will expire on GMT: 
Sunday, 7 February 2106 06:23:42
It's the classic Y2K38 problem.
https://en.wikipedia.org/wiki/Year_2038_problem

I do have a Pi somewhere I burn burn raspbian to.
I'll look into it and see if I can fix it over the Christmas break.

Roy