Dear all,

I have 2 lan cards, i want to configure DHCP server for both the cards like

1) one range is 192.168.1.10 to 192.168.1.55 (eth0) and the other range for (eth1) is 192.168.1 60 to 192.168.1.90.

Is it possible? if possible how to configure. I am using redhat 9 and whitebox.

As far as I know you cannot bind the same network address to 2 nics, you would have to have to different network id's for it to function correctly:

192.168.1.0

and:

192.168.2.0

You need to edit the /etc/dhcpd.conf file, redhat may be in a different place, I use slackware for my setup. A simple configuration would look like this:

ddns-update-style interim;
shared-network domain {
option routers 192.168.1.1; # ---> this is static ip-address of eth0
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option domain-name "domain"; # Can be domain or workgroup name
option domain-name-servers 192.168.1.1;
default-lease-time 86400;
max-lease-time 604800;
subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.55;
}
}

ddns-update-style interim;
shared-network domain {
option routers 192.168.2.1; # ---> this is static ip-address of eth1
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.2.255;
option domain-name "domain"; # Can be domain or workgroup name
option domain-name-servers 192.168.2.1;
default-lease-time 86400;
max-lease-time 604800;
subnet 192.168.2.0 netmask 255.255.255.0 {
range 192.168.2.60 192.168.2.90;
}
}

Although I have never tried 2 different cards with a dhcp server before

Yes, this is possible, if you use dhcpcd, then just run it for each interface.
The DHCP server configuration will supply the IP address when each interface bids, so controlling what interface gets what IP address is strictly controlled by the DHCP server. (I believe you will have to configure to assign IP addresses according to the MAC of the bidding machine.)

fotoguy is correct in stating that you will be assigning address in the same network assuming your netmask is 255.255.255.0.

This is not a problem if you set up your routing correctly. In your routing table there is the ability to set the metric. This is an arbitrary number that assigns the priority to interfaces in the same network. So if eth0 has metric 1 and eth1 has metric 2, then eth0 will be used first. eth1 will not be used unless eth0 is down.

Sorry I haven't provided specific configuration steps (I use Slack also), but hopefully this will help point you in the right direction.

it is to some extent possible...
2 options from what i know:

1) you can either bridge, and have 1 pool for both segments,

2) you can devide 192.168.1.x into 2 different subnets (which will do the job even better) example:

eth0:
address 192.168.1.1/25
network 192.168.1.0
broadcast 192.168.1.127

eth1:
address 192.168.1.129/25
network 192.168.1.128
broadcast 192.168.1.255

for the dhcp server you need to note the /25 sunet mask, which in the dhcp config file will look like 255.255.255.128
and the network address of the subnets is
for eth0: 192.168.1.0
for eth1: 192.168.1.128

enjoy :-)

or do a /26 (255.255.255.192)
an you get
192.168.1.0-63 (where 0=network and 63=broadcast)
and
192.168.1.64=127 (again: 64=network and 127=broadcast)

network addresses are not usable as ip addresses and
broadcast addresses are not usable as ip addresses either

NOTE:
remember to setup the dhcp server as a router too, otherwise the 2 subnets will not be able to communicate with eachother... unless of course that is what you want :-)