ip_forward is not working in small network

Hej!

I have set up a small network for testing with 3 computers:
PC1 (WinXP) <---> server (RedHat) <---> PC2 (WinXP)

On the server runs RedHat and I am using there nistnet for network
analyses. None of the computers are connected to the internet and thus
I turned off firewalls on all computers.

When I ping from PC1 to the server and vice versa everything is ok; the
same is for PC2 to the server and vice versa. But when I ping from PC1
to PC2 it's not working!

I set on the server the ip_forward-flag (command echo "1"
/proc/sys/net/ipv4/ip_forward).

Any idea why it is not working?

Thanks in advance,
Franz

Franz wrote:
> Hej!
>
> I have set up a small network for testing with 3 computers:
> PC1 (WinXP) <---> server (RedHat) <---> PC2 (WinXP)
>
> On the server runs RedHat and I am using there nistnet for network
> analyses. None of the computers are connected to the internet and thus
> I turned off firewalls on all computers.
>
> When I ping from PC1 to the server and vice versa everything is ok; the
> same is for PC2 to the server and vice versa. But when I ping from PC1
> to PC2 it's not working!
>
> I set on the server the ip_forward-flag (command echo "1"
> /proc/sys/net/ipv4/ip_forward).
>
> Any idea why it is not working?

Try

echo "1" > /proc/sys/net/ipv4/ip_forward
instead of
echo "1" /proc/sys/net/ipv4/ip_forward

and/or readout the value afterwards

cat /proc/sys/net/ipv4/ip_forward


Miyagi

>
> Thanks in advance,
> Franz

Hej! Somehow the routing tables has been reset ... so I had to set the
routes again.
BTW: here's a good description for that:
http://www.comptechdoc.org/os/linux/...ugrouting.html

Regards, Franz