Listening IP

[Frank Bulk - iNAME]

Why not load DHCP to bind to the second Ethernet port?  You can also use
iptables to manipulate just the DHCP response packets (that's what our DHCP
appliance does).

Frank

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On Behalf
Of Dean, Barry
Sent: Wednesday, July 02, 2008 8:26 AM
To: dhcp-users at isc.org
Subject: Listening IP

Hi, I have four DHCP servers, ISC DHCP 4.0.0 running on Solaris 10 x86 on
Sun X4200 hardware.

These machines have 4 network cards. The one I am using has id e1000g3.

On this card there are two IPs, an example:

e1000g3:        192.168.31.100  primary-name
e1000g3:1       192.168.31.10   dhcp

My config file says to listen on the 31 subnet thus:

subnet 192.168.31.0 netmask 255.255.255.0 {
  option subnet-mask 255.255.255.0 ;
  option routers 192.168.31.1 ;
  option domain-name-servers 192.168.120.100, 192.168.120.101 ;
}

Problem is clients report that the DHCP server that gave them an IP was
192.168.31.100, the primary-name.

I would like them to think it was the 192.168.31.10 IP, the dhcp name
instead.

With other daemons, like DNS, RADIUS, I am used to binding the service to an
IP, with DHCP it looks like you bind to an entire subnet, can this be
changed? I would only like the servers to listen on the "dhcp" interface and
only reply from it.

Thanks.

---------------
Barry Dean
Networks Team
Computing Services Department
Browlow Hill/Crown Street
Liverpool
Email: B.Dean_at_liverpool.ac.uk