Re: IP Forwarding Problem

[Thunder from the hill]

Hi,

On Mon, 27 May 2002, Abdij Bhat wrote:
>  I am trying to deploy IP Forwarding on an embedded system running on Linux
> [ Kernel > 2.4 ] with mips target.
>  I do a "echo "1" > /proc/sys/net/ipv4/ip_forward" to enable and "echo "0" >
> /proc/sys/net/ipv4/ip_forward" to disable the IP Forwarding feature.
> 
>  The hardware setup i have is as below
> 
> 1. Linux PC [ Ref PC A ] with eth0 IP Address say 192.168.100.5
> 2. Linux PC [ Ref PC B ] with eth0 IP Address say 192.168.101.5
> 3. The embedded target has 2 NIC's. eth0 IP Address is 192.168.100.6 and
> eth1 IP Address is 192.168.101.6.
> 4. A hub connecting subnet 100 machines
> 5. A hub connecting subnet 101 machines
> 
>  I setup the default gateways on both the Reference PC's to reflect their
> own IP Address. Each of the Ref PC's can ping to the machines on their
> subnet.
>  But when i ping Ref PC A to Ref PC B; the give the error "Destination host
> is unreachable".
> 
>  I tried to resolve the problem and found a few info on the net. Based on
> that i found that
> 1. there was no /etc/sysconfig directory on the target embedded system 
> 2. there was no /etc/sysconfig/network-scripts directory
> 3. no /etc/sysconfig/network-scripts/ifcfg-eth0, eth1, eth0:1 and eth1:0
> files 
> 4. there was no /etc/sysconfig/network file

They are altogether used by RedHat compatible startup scripts, and should 
not be necessary on embedded systems if your interfaces are ifconfig'ed. 
Is your routing table (route -n) set up correctly?

Try tracerouting from ref host A to ref host B while running tcpdump on 
the embedded penguin.

However, I don't believe this is an issue to linux-kernel, we should 
consider private talks...

>  I created all of the above [ i have pasted the contents of each file below
> ]. Yet i get the same error. Can somebody tell what am i not doing or what
> am i doing wrong?

You're expecting files to be applied.

Regards,
Thunder
-- 
Was it a black who passed along in the sand?
Was it a white who left his footprints?
Was it an african? An indian?
Sand says, 'twas human.