dhcp-users Digest, Vol 31, Issue 15

Derek Wang xiangshu129 at gmail.com
Sun May 8 02:51:47 UTC 2011

Hi Glenn,

thanks for your quick response!

I want to confirm with you about my understandings:
1). if the relay agent box has two interface, one is connected in the subnet
of the dhcp client
the other one is connected in the subnet of the dhcp server, then we do not
need to explicitly
specify the route, because the dhcp client use broadcast to send out the
dhcp request, after
the relay agent catch it, and then the relay agent generates new package to
the dhcp server
via unicast, as the relay agent has one interface connected in the dhcp
server's subnet, so this

2). for the relay agent has only one interface, then the relay agent need to
config the route explicitly,
because the relay agent and the dhcp server are not in the same subnet, so
it needs a way to route
the new generated package to the dhcp server.

the above are my understandings, if there are some misunderstanding in that,
please correct!

thanks in advance!

> Message: 3
> Date: Sat, 07 May 2011 21:28:03 +1000
> From: Glenn Satchell <glenn.satchell at uniq.com.au>
> Subject: Re: the question about the dhcp relay deployment
> To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> Message-ID: <4DC52CC3.2040804 at uniq.com.au>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> Usually not. The packets aren't routed directly through the box, they go
> into the box to the relay process. The relay process then generates new
> packets to the server.
> Of course you can run the dhcp relay on a box with a single interface
> too. It doesn't have to be the router for the network, it can be any
> box, as long as it has a route to the dhcp server.
> regards,
> -glenn
> On 05/07/11 11:37, Derek Wang wrote:
> > Hi all,
> >
> > When the dhcp client and dhcp server are not in the same subnet, we need
> to
> > make use of the relay agent to bridge the dhcp client and dhcp server.
> >
> > I have one question for that, do we need to enable the forwarding
> > service on the
> > relay agent machine? Or it's enough to just enable the relay agent
> service?
> >
> > thanks!
> > --
> > Best Regards,
> > Derek Wang
> >

Best Regards,
Derek Wang
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