UPDATED: Serving addresses to multiple subnets

John Tabasz (jtabasz) jtabasz at cisco.com
Fri Oct 9 16:19:49 UTC 2009

Thanks Simon,

I saw the message from Thomas and am happy to report that ISC DHCP 2.0.3 does indeed support shared networks. 
I have been considering upgrading to a more current version, just need to figure out how to do this without breaking anything.

Thanks Again,


-----Original Message-----
From: dhcp-users-bounces at lists.isc.org [mailto:dhcp-users-bounces at lists.isc.org] On Behalf Of Simon Hobson
Sent: Thursday, October 08, 2009 10:58 AM
To: Users of ISC DHCP
Subject: Re: UPDATED: Serving addresses to multiple subnets

John Tabasz (jtabasz) wrote:

>I'm sorry I neglected to include many important 
>points in my query. More details here:
>The DHCP server is ISC 2.0.3 running on Solaris 
>2.8 on a Sun V120. The DHCP server has a single 
>live interface on the subnet
>The router interface to which this subnet is 
>connected is part of a 8 port switch module 
>installed in a Cisco 3725 and has a secondary 
>subnet defined as such:
>interface Vlan1
>  ip address secondary
>  ip address
>  ip helper-address ß------ This is 
>the ip address of the dhcp server.
>  standby ip
>  standby ip secondary
>  standby priority 240
>  standby preempt
>  standby track FastEthernet0/0

As Paine, Thomas Asa wrote yesterday, this is a 
shared network and you simply declare it as such 
and it will work automagically.

However, version 2 is ancient - really ancient 
and has been unsupported for many years. From my 
very vague memory of it, it doesn't support 
shared networks. You really should consider an 

>From https://www.isc.org/software/dhcp/history 
"... Release 3.0, which had its alpha release in 
March 1999 and its final release in January 2003."

Even 3.0 went end of life over a year ago.

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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