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network configuration, dhcprealy, routing

Posted on 2004-04-16
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Last Modified: 2010-03-18
I install Linux (Suse distribution). I want to configure server that work as a router. I set the configuration file as follows:

#
# Network configuration for basic server
#
case ”$1” in
      start)
            echo "Starting the network"
            #
            # 1. Hostname
            #
            hostname server17
            #
            # 2. The loopback interface
            #
            ifconfig lo 127.0.0.1
            route add 127.0.0.1 lo
            #
            # 3. The ethernet interfaces
            #
            IPaddr_ext="192.168.149.17"
            Ipaddr_int="192.168.149.177"
            #  Get XXX from the note 'ServerIPaddresses'
            ifconfig eth0 $IPaddr_ext netmask 255.255.255.128
            ifconfig eth1 $IPaddr_int netmask 255.255.255.248
            #
            # 4. The default gateway
            #
            route add default gw 192.168.149.1   #<- this is my dhcp server
            #
            # Enable routing
            #
            echo 1 > /proc/sys/net/ipv4/ip_forward
            ;;
      stop)
            echo ”Stopping the network”
            ifconfig eth0 down
            ifconfig eth1 down
            ifconfig lo down
            ;;
esac


I started dhcprelay. The clients connected to my server don't get IP addresses.

Thans for any help
Best regards

Adam
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Question by:adamgasior
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brabard earned 210 total points
ID: 10848005
The mechanism of dhcpreley is your dhcpd have to listen on 192.168.149.177:bootps , to forward dhcp requests comming to eth1to 192.168.149.1 and to forward the obtaining dhcp information back to the client trough eth1 .
So 2 most possible reasons are dhcpd on eth1 in not listening , or - dhcp server on 192.168.149.1 is not configured with proper pools/permitions .
The best way to find the problem is to use tcpdump on both machines to see what happen with packets .
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