[Kea-users] DHCP Relay and RFC5107

[Darren Ankney]

Hi Joe,

Have a look at flex-option:
https://kea.readthedocs.io/en/kea-2.2.0/arm/hooks.html#flex-option-flexible-option-actions-for-option-value-settings
you can change/add/remove the content of pretty much any option based
on rules that you create.  This should allow you to do what you want
without needing to wait for support from a relay.  You may need this
setting: https://kea.readthedocs.io/en/kea-2.3.8/arm/dhcp4-srv.html#ignore-dhcp-server-identifier
that is only available from 2.3.8 forward or Kea may not respond to
the return packets that have a different server identifier.

Thank you,

Darren Ankney

On Sat, Jun 24, 2023 at 5:27 AM Joe Botha <joe at swimgeek.com> wrote:
>
> Hi
>
> Know of any DHCP Relays that support RFC5107?
>
> Does Kea have any plans to release a DHCP Relay? - since the ISC one is end of life (I think).
>
> Since Kea 2.1.3 it supports RFC5107:
>
> Server Identifier Override. Kea now supports Relay Agent option for Server Identifier Override (sub-option 11), which is defined in RFC5107. With this capability, the relay agent can send its own IP address while forwarding client's packets to the server. The server will then insert it as the server identifier when sending back a response. This will ensure that all the traffic always goes through the relay, which is beneficial in some cases.
>
> Basically we need dhcp clients to keep communicating via our relays and not directly to the server so we can add /32 routes to the correct VLANs.
>
> --
> Swimmingly,
>  Joe
>
> swimgeek.com/blog  +27 82 562 6167  instagram.com/joe.swimgeek
>       "...all progress depends on the unreasonable man.”
>
>
>
> --
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