settings on the linux server
OS: Redhat 9
eth0: 192.168.1.98/24
eth1: 192.168.10.1/24

route-eth0 file:
192.168.1.0/24 via 192.168.1.98

route-eth1 file:
192.168.10.0/24 via 192.168.10.1

my own subnet is 192.168.10.0
internet accessing router internal port: 192.168.1.99/24

problem:

i want to use this linux server as a router between the real router and the subnet. all the internet request from my subnet will be forward to the real router.

my client pc in the subnet has address :192.168.10.253

i can ping the 192.168.1.98 successfully from the client pc, but failed by ping 192.168.1.99.

On the server side, i can ping any internet address successfully.

so guess there are some problem of routing, who can help me? thanks a million!

I think I see what you're trying to do. You have a router [presumably some Linksys hardware thing or something similar] on 192.168.1.99/24, and you have a Linux box on 192.168.1.98/24. You also have another network connected to your eth1 using subnet 192.168.10.0/24 that you want to be able to access the internet. If I got this wrong, let me know.

I am not familiar with the syntax of Redhat's route files. However, I presume you have them correct. If you can ping the Linux machine from any of the machines on the 192.168.10.0/24 subnet, it's working.

What you need to do is turn IP forwarding on so the Linux machine can act as a router. To do this, run the following command as root:

echo 1 > /proc/sys/net/ipv4/ip_forward

More than likely, you will need to set up a static route on the hardware router that will route 192.168.10.0/24 to 192.168.1.98 . If you're not sure how to do that, look in the manual or give the router's model number here.

thanks man!!! you are on the right point. All your assuming are exactly right.

i didn't turn on the ip forwarding. I am gonna turn it on tomorrow and show your the result.

Many many thanks!

today i turned on the ip_forward, but the routing still didn't work.

shoud i configurate the ipchains as well? is the ipchains necessary for just routing?

but i failed to use the ipchains, when i type:
#ipchains -L
the response is : "ipchains: Incompatible with this kernel"

i guesst i should recompile the kernel, shouldn't I?

here's the routing table on the linux server.

[root@Webnetredhat9 root]# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
192.168.10.0 * 255.255.255.0 U 0 0 0 eth1
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 192.168.1.99 0.0.0.0 UG 0 0 0 eth0
[root@Webnetredhat9 root]#

i turn on the ip_forwarding, and it still doesn't work, please save me, my boss is gonna kill me