Hi everybody,
I have redhat linux 9.0 installed on my machine with 2 fast ethernet NICs.
The task I want to accompish is to send traffic through the machine (through Nistnet emulator) and recieve on the other end.
Both the transmitting and recieving ports are on one network testing instrument.
Now, thw IP addresses assigned are
Transmitting port of testing instrument : 10.4.23.24
Recieving port of testing instrument : 10.4.23.25
NIC 1: 10.4.23.26
NIC 2: 10.4.23.27

I have enabled IP-forwarding using
< echo "1" > /proc/sys/net/ipv4/ip_forward >

I have also made changes to the routing table as
destination for eth0 and eth1 are 10.0.0.0 , so that it can let the traffic go through it.

But Nistnet emulator is still not working.
I am using xnistnet with GUI.
I entered source as 10.4.23.24
destination as 10.4.23.25
and vice versa in the next line.
It does not show me any readings.

Moreover When I type command "xnistnet", though the GUI screen appears, the message on the terminal is
"globalstatnistnet: no such device"
And when I enter source and destination addresses and press the "update" button, it gives me message as
"util_binaddnistnet: no such device
Error adding 10.4.23.24 ->10.4.23.25 "

Please guide me if I am wrong somewhere, because I am novice in the field of networking as well as linux.

Atul