Hello Sergio, thanks for your support, I found my mistake, I changed the IP address from 192.168.0.2 to 172.168.0.2 because the 192.168.0.2 is already taken in my network. When using 192.168.5.2 everything is working fine. Hence I think I have to read something more about tap devices and default gateways.
best Matthias On Fri, Oct 3, 2014 at 3:27 PM, Sergio R. Caprile <[email protected]> wrote: > OK, here I go... > The UN*X examples use a tun/tap device, and there is a specific > configuration parameter for different flavors of it. Check the Makefile > for this, did you ? > #To compile for linux: make ARCH=linux > #To compile for cygwin: make ARCH=cygwin > #To compile for openbsd: make ARCH=openbsd > ARCH=linux > Once you have the correct tun or tap device, it will show up in your > ifconfig and you will be able to ping the lwIP stack as a new machine on > a new network, which is what you should do first when debugging > networking problems. > > In main.c: > /* startup defaults (may be overridden by one or more opts) */ > IP4_ADDR(&gw, 192,168,0,1); > IP4_ADDR(&ipaddr, 192,168,0,2); > IP4_ADDR(&netmask, 255,255,255,0); > > So, 192.168.0.1 will be the address of the gateway in your machine to > "the lwIP network", via a tun or tap interface. In Linux seems to be tap > > tap0 Link encap:Ethernet HWaddr 86:99:D8:CE:27:DC > inet addr:192.168.0.1 Bcast:192.168.0.255 Mask:255.255.255.0 > inet6 addr: fe80::8499:d8ff:fece:27dc/64 Scope:Link > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:500 > RX bytes:0 (0.0 b) TX bytes:468 (468.0 b) > > The specifics to get the tap working are beyond my knowledge, I remember > I just followed a tutorial. The interface will be up once the example is > running, and will dissappear after that. > Anyway, you should be able to ping that interface to check if the tap is > working. > > And, 192.168.0.2 will be your "lwIP machine" address, you should be > able to ping it > > [root@Hal minimal]# ping 192.168.0.2 > PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data. > 64 bytes from 192.168.0.2: icmp_seq=1 ttl=255 time=8.76 ms > 64 bytes from 192.168.0.2: icmp_seq=2 ttl=255 time=9.66 ms > > --- 192.168.0.2 ping statistics --- > 2 packets transmitted, 2 received, 0% packet loss, time 999ms > rtt min/avg/max/mdev = 8.766/9.214/9.663/0.458 ms > > and you should be able to telnet to it in port 7, cause no one knows if > your > > SimpleEchoClient really works, although you probably will. > > > [root@Hal minimal]# telnet 192.168.0.2 7 > Trying 192.168.0.2... > Connected to 192.168.0.2. > Escape character is '^]'. > hola > hola > > You probably noticed I run this as root... there are some permissions > associated to the tap interface, and I'm lazy enough to change them. > Anyway, you should see something like this: > tapif: tapif_init: open: Permission denied > if that is the case. > > > > _______________________________________________ > lwip-users mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/lwip-users ᐧ _______________________________________________ lwip-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/lwip-users
