[vox-tech] 2 dhcp servers, one box

[Doug Huckaba]

I think you can configure dhcp to give out of 2 different address ranges 
based on the network the request came in on. Check out the man page for 
dhcpd.conf. 

I just checked and I'm running isc's dhcpd

hope it helps...
-doug

Here's the syntax (base on my dhcpd.conf and your information):

server-identifier houston;
default-lease-time 86400;
max-lease-time 172800;
option domain-name-servers	192.168.16.15;
option domain-name	"mrdoug.com";
option subnet-mask	255.255.255.0;
subnet 192.168.0.0 netmask 255.255.255.0{
	range  192.168.0.20 192.168.0.30;
	option broadcast-address		192.168.0.255;
	option routers		$ip_of_the_nic_for_this_network
}
subnet 192.168.1.0 netmask 255.255.255.0{
	range  192.168.1.20 192.168.1.30;
	option broadcast-address		192.168.1.255;
	option routers		$ip_of_the_nic_for_this_network
}



-- 

Today, Matthew Holland spewed forth:

> Does anyone have any experience running multiple dhcp servers out of one 
> box?  Allow me to clarify... I have a box with three network cards: eth0 
> is connected to the DSL modem, eth1 to a 192.168.0.0/24 network 
> (MASQed), and eth2 will be connected to a 192.168.1.0/24 network (which 
> I also intend to MASQ).  There are various cabling considerations that 
> have made this arrangement seem sensible.  I'm running dhcpd on eth1, 
> because there are as many laptops in the house as desktops.  The 
> potentially tricky part is that I installed eth2 so that I can plug my 
> laptop into it when I'm in the same room as the router.  This makes it 
> appealing to run dhcpd on eth2 as well, so that I don't have to do any 
> funny voodoo every time I plug the laptop into a different network.
> 
> That said, there may be some voodoo to do concerning the configuration 
> of dhcp.  There's no issue of overlapping blocks of addresses since the 
> networks are different.  The question is, do I need multiple copies of 
> dhcpd.conf and dhcpd.leases, or can two daemons share the same files?  I 
> imagine it's possible that both subnets could be defined in the same 
> dhcpd.conf, since each instance of dhcpd should know which network it's 
> on.  But then again, it may not work that way.
> 
> Any other gotchas that I should be aware of?  In case it matters, the 
> machine is running Gentoo Linux.
> 
> Thanks,
> Matt
> 
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