yes im talking about multicast (224.x.y.z) although in this case you won't
need that. I found that I needed this set if the Linux box was acting as the
DHCP Server.
You're description on DHCP is correct, they obviously run on UDP
ports...sorry I don't have any suggestions for you
goodluck :)
Stephen
-----Original Message-----
From: Howard Lowndes [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, September 26, 2000 4:34 PM
To: Stephen Mills
Cc: Mail List - SLUG
Subject: RE: [SLUG] Help with dhcrelay
The Linux box on subnet A only has the dhcrelay agent. It acts like a
server on its resident subnet, but actually forwards the request on to a
real server on another subnet. When that server comes back with a
response then the agent passes it on to the original client, which thinks
that it came from a server on the local subnet.
Both the clients and the server are on NT boxen, the relay agent is on a
Linux box acting principally as a router.
What are you calling the multicast route in this, surely not 224.x.y.z
etc? The client sends the DHCPDISCOVER with source 0.0.0.0:67 and
destination 255.255.255.255:68. The agent grabs this and forwards it to
the server on port 68. The server comes back to the agent with the
DHCPOFFER on port 68 and the agent should then shoot it back as source
0.0.0.0:68 destination 255.255.255.255:67 but put onto the ethernet at
level 2 using the MAC that was in the original DHCPDISCOVER packet. I
think thats the way it works.
--
Howard.
______________________________________________________
LANNet Computing Associates <http://www.lannet.com.au>
On Tue, 26 Sep 2000, Stephen Mills wrote:
> maybe im a little confused, but any of these machines running dhcpd ? or
> linux is acting as the client ?
> maybe a silly question, but do you have the multicast route set on the
Linux
> box ? I haven't setup DHCP relays on Linux before, but its just a thought,
> although this route is not required if its just a dhcp client.
>
> Stephen
>
>
> -----Original Message-----
> From: Howard Lowndes [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, September 26, 2000 3:56 PM
> To: Mail List - SLUG
> Subject: [SLUG] Help with dhcrelay
>
>
> I am trying to get dhcrelay to work between 2 subnets.
>
> The agent sits on subnet A and hears the DHCPDISCOVER packets OK (they are
> from NT boxen, BTW) and forwards them on to the DHCP server on subnet B
> (again an NT box). The server comes back with a DHCPOFFER to the agent,
> but the latter fails to forward this back to the requesting client's MAC
> address, it just ignores it.
>
> Looking at the packets with tcpdump they look fine, in both directions,
> and forwarding is set on, but I do not think that would be an issue here
> anyway.
>
> There used to be a hassle with Linux and the ultimate broadcast IP. Is
> that still a hassle and how do I set it up under linuxconf (preferably)
>
> All and any assistance appreciated.
>
>
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More Info: http://slug.org.au/lists/listinfo/slug
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More Info: http://slug.org.au/lists/listinfo/slug
