---- On Wed, 24 Jul 2024 02:48:15 +0100 Karl Denninger wrote ---
> I'd like to replicate this that is currently being sent up via
> dhcp6c, which is not quite-clear to me from the docs on how to do that.
> #
> # This configuration will attempt to get /56 or a /60 from the
> # ISP and assign a /64 internally.
> # Note that if you have a /60 you can have four /64s defined; if
> you have a
> # /56 then obviously you can have 16 internal networks. For most
> "house"
> # size networks four separate delineations is enough, for most
> "moderate"
> # sized corporate environments 16 is enough. BE AWARE THAT THE
> SLA-LEN MUST
> # MATCH THE DIFFERENCE BETWEEN THE LOCAL PREFIX AND THE REMOTE
> ONE! If
> # you ask for a /56 then sla-len is 8, if you ask for a /60 then
> the sla-len
> # is 4 (difference between the requested prefix length and 64,
> respectively.)
> #
>
> interface igb0 {
> send ia-pd 1;
> send ia-na 1;
> send rapid-commit;
> script "/usr/local/etc/dhcp6c.script";
> };
>
> id-assoc na 1 {
>
> };
>
> id-assoc pd 1 {
> prefix ::/56 1800;
>
> prefix-interface igb1 {
> sla-id 0;
> sla-len 8;
> };
>
> };
>
> igb1 is the "normal" internal network; igb0 is the external one.
> The ISP hands out /56s (although at one time I could choose either
> a /56 or /60); I have routines in the script file that then generate
> dynamic updates for DNS so the gateway has its pointers updated if/when
> the address changes (I run my own zones)
>
> Its not entirely-clear how to replicate that in the config file for
> dhcpcd; I can figure out the script I'm sure, but the base config is not
> clear to me.
So you would add this to the bottom of the default dhcpcd.conf file:
interface igb0
ia_na
ia_pd 0/::/56 igb1/0/64
That mirrors your config exactly apart from requesting a specific lifetime
which dhcpcd doesn't support for PD.
rapid commit is enabled already in the default dhcpcd.conf file.
You could then edit /etc/dhcpcd.exit-hook to handle your DDNS.
You might be able to get away with this lighter config as well, based on what
you said:
interface igb0
ia_na
ia_pd 0 igb1
Any pointers on now to make this more clear in dhcpcd.conf(5) are welcome.
Good luck!
Roy
