Running new dhcpd instance on same physical interface

[Dario Aguilar]

Hi, I understand your point. Our idea is to isolate different kind of
services/clients such as DSL, Wimax, IPTv, etc.. into different instances of
dhcpd, we have many reason to do this (with just 1 box): Eg.
Troubleshooting, availability, separate same subnets on diff. instances,
etc... In fact none of this CPE´s are directly connected to the dhcp server
(I mean on the same broadcast domain) so, the server will never receive any
broadcast packets. Instead of that it will receive forwarded packets from
several DHCP Relay´s (unicast traffic) for each service such as DSLAM´s,
WAC´s, etc..

I will appreciate very much if you have a better idea or another suggestion
on how to resolve this without adding another physical interface that in
fact it will be connected to the subnet that the other one.

Thanks,

Dario.


-----Mensaje original-----
De: dhcp-users-bounces at lists.isc.org
[mailto:dhcp-users-bounces at lists.isc.org] En nombre de Simon Hobson
Enviado el: Miércoles, 11 de Marzo de 2009 05:35 p.m.
Para: Users of ISC DHCP
Asunto: Re: Running new dhcpd instance on same physical interface

Dario Aguilar wrote:

>Hi there, I trying to run a new instance of 
>dhcpd on the same physical interface but with a 
>different IP Address (on the same subnet/vlan, 
>Eg.: 1st instance IP = 192.168.0.1/24 and 2nd 
>instance IP= 192.168.0.2/24) and with a new 
>sub-interface. Of course I´ve change conf. 
>files, pid-file name, leases DB, etc...

Simple - you can't. It is physically impossible to do.

The reason is that the server needs to work with 
broadcast traffic, and by definition, broadcast 
traffic does not 'belong' to any IP subnet, and 
so cannot be "associated" with any particular 
interface/sub-interface.

In general, there is no reason to need to run two 
servers - you can normally achieve most things 
with one. Perhaps if you explained what you want 
to achieve then we could make suggestions.
-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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