[lwip-users] unixsim port tunneling issues

[Rishi Khan]

I am looking to port lwip to a embedded processor. But first, I  
wanted to test the performance of the TCP/IP stack on linux (ubuntu  
7.10). I built the unixsim and minimal projects in the contrib unix  
ports directory. When I run them with no options they work properly  
(after fixing bug I filed: #22983). However, I cannot use them on the  
network ... they only work locally. I would like to test the  
performance by using netperf on the lwip and on a normal linux  
machine. How do I let lwip access the outside world?

First, I noticed that the tap0 interface is configured by ifconfig  
with the gateway instead of the IP address. Why is this?

Second, if I try something like:

./simhost -i 192.168.9.253 -g 192.168.9.253

I cannot connect to the TCP/IP side from another machine (on the  
192.168.9.0 subnet), but I can get pings. I get "Connection Refused"  
when I try to "telnet 192.168.9.253". I also tried something like:
./simhost -i 192.168.9.252 -g 192.168.9.253

In this case, .252 is not accessible at all and .253 exhibits the  
same issues as above. Why would the gateway be accessible but not the  
actual IP? It seems that this has something to do with ifconfig issue  
above.

Can anyone give me some pointers as to how to move forward?

        -rishi