Help!: Dhcp problem

[Robero Allende]

I've this problem with dhcpd:

No subnet declaration for eth1 (170.210.248.38).
Please write a subnet declaration in your dhcpd.conf file for the
network segment to which interface eth1 is attached.
exiting.

and this is my dhcp.conf:

server-identifier       harlan.di.unc.edu.ar;
default-lease-time      10000000;
max-lease-time          10000000;
option domain-name      "di.unc.edu.ar";

subnet 170.210.248.0 netmask 255.255.255.224 {
}

subnet 192.168.0.0 netmask 255.255.0.0 {
        option domain-name-servers      192.168.1.254;
        option routers                  192.168.1.254;
....
....
....

if I change the line:

subnet 170.210.248.0 netmask 255.255.255.224 {
}

and changing the number of the netmask it's gives an ok, but the network
doesn't work... so any idea ?

thanks 
r.