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dhcpd config to span subnets question



Hello all,

I have a network with a special router which will forward DHCP requests 
from a client in one subnet to my Debian (up-to-date woody) server on a 
different segment.  My question is, how do I, (or can I), configure 
dhcpd.conf to allow the dhcpd to serve a 172.21.2.xx,255.255.255.0 
range from my eth0 interface which has an IP of 
172.21.0.2,255.255.255.0?

dhcpd.conf
----------
default-lease-time		1200;
max-lease-time			2400;
option subnet-mask		255.255.255.0;
option routers			172.21.2.1;
option domain-name-servers	172.21.0.2;
option domain-name		"mydomain.com";
subnet 172.21.2.0 netmask 255.255.255.0 {
	range	172.21.2.20 172.21.2.200;
}

cnsu:~# ifconfig eth0
        -------------  
eth0      Link encap:Ethernet  HWaddr 00:40:53:00:E6:17
          inet addr:172.21.0.2  Bcast:172.21.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3555 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3780 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:426535 (416.5 KiB)  TX bytes:759521 (741.7 KiB)
          Interrupt:11 Base address:0x6800

cnsu:~# dhcpd
        -----  (error when starting dhcpd server)
<<snip>>
No subnet declaration for eth0 (172.21.0.2).
Please write a subnet declaration in your dhcpd.conf file for the
network segment to which interface eth0 is attached.
exiting.

-- 
Thanks in advance for any help.
Bill


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