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Today's Topics:
1. Re: Multiple dhcp relay process (Simon Hobson)
----------------------------------------------------------------------
Message: 1
Date: Thu, 6 May 2021 18:17:08 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Multiple dhcp relay process
Message-ID: <2a31d823-ccef-46a1-9666-0085f7d5c...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
Renuka Devi <renukar...@gmail.com> wrote:
> Do we have to enable any flags or modify ISC dhcp relay code to make it
> working ?
Asa far as I know (I don't use it myself, but it shares code with the client
and server), all you have to do is invoke it with arguments that mean each
instance uses different config, PID, etc files. I suspect most distro startup
files don't allow for this, so you'll be needing to roll your own.
There is one area I don't know about. I thought that the relay agent might have
to listen on the interface through which it talks to the server - but I'm not
sure about that. If it does, then the upstream interfaces need to be different.
But it's also possible that it uses ordinary unicast packets passed through the
hosts IP stack to talk to the server(s).
I raise this as I have a vague memory of seeing issues with this discussed
here, but it's only vague. Hopefully someone with a better grasp can shed some
light.
So as I read the man page, and if it uses the host IP stack, then you'd invoke
the different instances like this :
dhcrelay -4 [some options] -i eth0 -i eth1 192.168.1.123
dhcrelay -4 [other options] -i eth2 192.168.57.66
I see it doesn't have a config file or any storage (leases file), so those
problems are gone. If your process management system uses PID files, then
you'll need to make sure that they are different.
Simon
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