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From: Marco Moock <mm+usenet-es@dorfdsl.de>
Newsgroups: comp.os.linux.misc
Subject: Re: I never thought of this scenario
Date: Sat, 20 Apr 2024 17:12:19 +0200
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On 20.04.2024 um 13:28 Uhr The Natural Philosopher wrote:

> On 20/04/2024 12:54, Marc Haber wrote:
> > Richard Kettlewell <invalid@invalid.invalid> wrote: =20
> >> I don=E2=80=99t 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. =20
> >=20
> > 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.
> >=20
> > 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.
> >=20
> > 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.
> >=20
> > Greetings
> > Marc =20
>=20
> The so called 'relay agent' is simply part of what high end routers
> DO. A router is itself a 'relay agent'

It is completely independent of routing. A normal computer can act as
an DHCP relay agent.
Professional routers simply include that because there is often a need
for it and the amount of performance and work needed for the relay
agent is small.


--=20
kind regards
Marco

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