[lwip-users] Connect [Bridge] two machines running lwip applications

[Saket Chawla]

Hi,

I came across this thread http://lists.gnu.org/archive/html/lwip-users/2004-08/msg00006.html to bridge lwip to ethernet

So was trying to make it work

This is what i did

1) Connected two laptops over local ethernet

2) Ran the lwip stacks with simhost application in contrib over both machines

              IP config over 1st machine

                       eth0    inet addr:169.254.4.210  Bcast:169.254.255.255  Mask:255.255.0.0

                       in simhost.c i changed IP to 

                                  IP4_ADDR(&gw, 169,254,0,1);

                                  IP4_ADDR(&netmask, 255,255,0,0);

                                  IP4_ADDR(&ipaddr, 169,254,0,11);

              IP config over 2nd machine

                       eth0    inet addr:169.254.10.101  Bcast:169.254.255.255  Mask:255.255.0.0

                       in simhost.c i changed IP to 

                                  IP4_ADDR(&gw, 169,254,0,2);

                                  IP4_ADDR(&netmask, 255,255,0,0);

                                  IP4_ADDR(&ipaddr, 169,254,0,12);

3) Executed the simhost code

4) Did the steps as in the link

            1st machine

               sudo ifconfig tap0 0.0.0.0 promisc

               sudo ifconfig eth0 0.0.0.0 promisc

               sudo brctl addbr br0

               sudo ifconfig br0 169.254.0.10

               sudo brctl addif br0 eth0

               sudo brctl addif br0 tap0

            2nd machine

               sudo ifconfig tap0 0.0.0.0 promisc

               sudo ifconfig eth0 0.0.0.0 promisc

               sudo brctl addbr br0

               sudo ifconfig br0 169.254.0.9

               sudo brctl addif br0 eth0

               sudo brctl addif br0 tap0

5) After these also machines were not able to reach each other and no IP show on eth0 and tap0 interfaces 

                       so disconnected and re-connected eth0 and also closed and restarted the simhost applications

                       after which they show their respective IP

                  

6) Now machines can ping each other's  eth0 IP , bridge IP , tap0 IP

        However they are not able to ping each other simhost IP which are 169.254.0.11 and 169.0.254.12 for respective machine

So basically after bridging i am able to reach upto the tap (lwip gateway) interface but not upto lwip application.

Any help/advice/link would be helpful. Let me know if i missed any other information

-- 

Thanks
Regards
Saket Chawla