Re: I never thought of this scenario

On 20/04/2024 12:54, Marc Haber wrote:

Richard Kettlewell <invalid@invalid.invalid> wrote:

I don’t personally care how DHCP gets across routers but from a quick
skim it looks like it relies some kind of relay agent. Table 1 or
section 3.1 might be reasonable references.

 DHCP uses both broadcast and unicast communication. Broadcast is
mainly used in stages where the client system does not yet have a
valid IP address and thus cannot use unicast.
 For the broadcast part of the protocol, a relay agent is needed when
the DHCP server does not have access to the broadcast domain the
client is connected to.
 As soon as the client can speak proper IP, it communicates directly
with the DHCP server, this part of communication relys on regular IP
routing and does not need the relay agent any more.
 Greetings
Marc

The so called 'relay agent' is simply part of what high end routers DO. A router is itself a 'relay agent'
--
“People believe certain stories because everyone important tells them, and people tell those stories because everyone important believes them. Indeed, when a conventional wisdom is at its fullest strength, one’s agreement with that conventional wisdom becomes almost a litmus test of one’s suitability to be taken seriously.”
Paul Krugman