dhcpcd-discuss

Hi Scott

On 05/09/2017 12:09, Scott Leggett wrote:
> My ISP provides a /60 and I'm having trouble delegating it correctly to
> the other interfaces on my router using dhcpcd.
> 
> This is on current master/HEAD (dhcpcd-7.0.0-rc1-55-g5da607b5).
> 
> /etc/dhcpcd.conf:
> 
>   noipv6rs
>   allowinterfaces enp1s0
>   interface enp1s0
>       ipv6rs
>       ia_pd 1 enp2s0/1 wlxc412f52e39d2/2 wlxc412f52ebb7b/3 enp3s0/4

Looks fine.

> log snippet:
> 
>   systemd[1]: Started DHCP Client Daemon.
>   dhcpcd[248]: enp1s0: soliciting a DHCPv6 lease
>   dhcpcd[248]: enp1s0: ADV 2401:a400:2704:1750::/60 from fe80::d6ca:6dff:fe74:72f8
>   dhcpcd[248]: enp1s0: REPLY6 received from fe80::d6ca:6dff:fe74:72f8
>   dhcpcd[248]: 2401:a400:2704:1750::/60 262
>   dhcpcd[248]: 2401:a400:2704:1750::/60 258

I've pushed a commit to remove that now useless debug:
https://dev.marples.name/rDHC2a9c90cb90828bce6621a5b92e67e375186e5c81

>   dhcpcd[248]: enp1s0: adding address 2401:a400:2704:1750::/60
>   dhcpcd[248]: enp1s0: renew in 302400, rebind in 483840, expire in 604800 seconds

Heh, we shouldn't treat delegated prefixes as addresses
Fixed here:
https://dev.marples.name/rDHC03e4b0ec893f32acebcc2324a1cc608e2782f020

>   dhcpcd[248]: lo: adding reject route to 2401:a400:2704:1700::/60
>   dhcpcd[248]: enp2s0: adding address 2401:a400:2704:1701::1/64
>   dhcpcd[248]: enp3s0: adding address 2401:a400:2704:1704::1/64
>   dhcpcd[248]: wlxc412f52ebb7b: adding address 2401:a400:2704:1703::1/64
>   dhcpcd[248]: wlxc412f52e39d2: adding address 2401:a400:2704:1702::1/64
>   dhcpcd[248]: enp2s0: adding route to 2401:a400:2704:1701::/64
>   dhcpcd[248]: enp3s0: adding route to 2401:a400:2704:1704::/64
>   dhcpcd[248]: wlxc412f52ebb7b: adding route to 2401:a400:2704:1703::/64
>   dhcpcd[248]: wlxc412f52e39d2: adding route to 2401:a400:2704:1702::/64
> 
> Notice that the prefix received from the upstream router
> (2401:a400:2704:1750::/60), appears to be incorrectly interpreted later
> as a /56 (2401:a400:2704:1700::/60), which is then delegated incorrectly
> to the interfaces. E.g. the delegation to enp2s0 should be
> 2401:a400:2704:1751::1/64, but instead it is 2401:a400:2704:1701::1/64.
> 
> Have I misconfigured dhcpcd, misunderstood prefix delegation, or hit a
> bug?

I don't see that in your log snippet?
If the above two fixes don't fix it for you, please provide more logs
but with debug enabled in dhcpcd.conf this time please.

Roy