Hello, please help! I am trying to add route and it does not work for me. I simply want to route from eth0 to eth1. My configuration as follow:

Thanks Jay.

[root@localhost sbin]# ./route add -net 192.168.100.0/24 gw 192.168.0.1
[root@localhost sbin]# ./route add -net 192.168.0.0/24 gw 192.168.100.1
[root@localhost sbin]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.100.0 192.168.0.1 255.255.255.0 UG 0 0 0 eth0
192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
192.168.0.0 192.168.100.1 255.255.255.0 UG 0 0 0 eth2
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

this doesn't make sense. you can't route TO a local subnet, it's already there.... sounds to me like you want to enable ip forwarding to make it actually route between the networks it is directly attached to.

Thanks! I do agree with you. Now I am looking in to how to setup IPforward. Any suggestion on how to enable IP forwarding feature. I recently installed fedora core 5 and it seem it does not have command “ipfwadm”. Any help I appreciated.

Tks
Jay

just runthere is also a static equivalent you can add to your sysctl.conf file if your distro uses it, but i forget the exact details.

Like acid kewpie said, you can set IP Forwarding to be enabled when the machine is started by adding this line to your /etc/sysctl.conf file:
But it's also common practice to use the "echo 1 > etc..." inside your firewall script. The static method may be more suitable for a dedicated server.

Please help with my router. I have 2 computers I want to connect both on internet using linux router(one of the computer). I added the line
net.ipv4.ip_forward = 1
to /etc/sysctl.conf file. Only one of my network card let me activated it (the one that is connect to the modem: internet eth1). The other card eth0 won't let me activated it. eth0 is connect to a switch that connect my windows XP computer. I am doing something wrong? Please help.
Thank everyone

turbowilliam, please don't threadjack. you should start a new thread explaining your problem, and clarify exactly what you mean buy "activated"

Thanks for your support. I am still stuck on same problem. I may have missed something else. I have in Linux box with two Ethernet port Eth1 and Eth2. All I want to do is ping from PC1 to PC2 so I can insert delay and jitter on each port. First step is to get the IP forward working correctly then I can move forward.

In Linux box IP address as follow.
Eth1: IP address is 192.168.5.1/24 gw 192.168.5.2
Eth2: IP address is 192.168.1.1//24 gw 192.168.1.2
I also typed following command in Linux box.
echo 1 > /proc/sys/net/ipv4/ip_forward

Here is my overall configuration IP address.

PC1 (192.168.5.2 gw 192.168.5.1) Linux Eth1(192.168.5.1 gw 192.168.5.2) Linux (192.168.1.3 gw 192.168.1.1)  PC 2 (192.168.1.1 gw 192.168.1.3)


My routing table below from Linux box

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 192.168.5.2 0.0.0.0 UG 0 0 0 eth1

I also have tried route add insert proper gateway in both interfaces. (example: 192.168.5.0 192.168.5.2)
I also add route in PC.

Please help this problem driving me crezzzy.

Tks
Jay

Thanks to you all got it working. I had XP running with firewall on. Once I disable the firewall it started working.