dchpd, multiple interfaces

Robert0380 · 05-12-2003, 02:27 AM

For now this is all hypothetical:

I have a Linux router with 4 NICs

eth0 - 192.168.1.100, is connected to another router

eth1: 10.0.1.1 - network 1 netmask 255.255.255.0
eth2: 10.0.2.1 - network 2 netmask 255.255.255.0
eth3: 10.0.3.1 - network 3 netmask 255.255.255.0

is it possible to run dhcpd on this router and have it give out ip addresses on the eths 1-3 based on the network...i.e is it possible to set up dhcp to give out adresses 10.0.1.2-10.0.1.254 on eth1, 10.0.2.2-10.0.2.254 on eth 2 and 10.0.3.2-10.0.3.254 on eth3? I already know about forwarding and getting the networks communicating, but can 1 Linux box handle 3 different networks pertaining to dhcp leases. Right now I have it setup to give out all its IP addresses on eth1. 10.0.1.2-10.0.254.254

Thanks

Robert0380 · 05-12-2003, 12:36 PM

well, i know it wont allow mulitple instances of dhcpd

dorian33 · 05-12-2003, 01:43 PM

Of course, you can. The dhcpd.conf can contain (for instance):

Code:

subnet 10.0.1.1 netmask 255.255.255.0 {
  option routers                      router_ip.;
  option subnet-mask              255.255.255.0;
  ..........
  range dynamic-bootp 10.0.1.2   10.0.1.254;
  default-lease-time 21600;
  max-lease-time 43200;
}
subnet 10.0.2.1 netmask 255.255.255.0 {
  option routers                      router_ip.;
  option subnet-mask              255.255.255.0;
  ..........
  range dynamic-bootp 10.0.2.2   10.0.2.254;
  default-lease-time 21600;
  max-lease-time 43200;
}
etc.....

Robert0380 · 05-13-2003, 08:19 AM

so if i have 2 NICs, with IPs 10.0.1.1 and 10.0.2.1, and i run dhcpcd, will it automatically listen on those 2 interfaces?

dorian33 · 05-13-2003, 11:57 AM

Quote:

Originally posted by Robert0380
so if i have 2 NICs, with IPs 10.0.1.1 and 10.0.2.1, and i run dhcpcd, will it automatically listen on those 2 interfaces?

According to the manual - yes. What is more there is no way to set any interface not be serving dhcp.