Hello again, forget my last mail, I think I found something like a real reason for the not working minimal example. After some debugging (starting with the not working ARP resolution) I found that the netif flags are not initialised in the mintapif_init in mintapif.c. After adding:
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_IGMP; everything is working fine. best Matthias On Tue, Oct 7, 2014 at 12:39 PM, Matthias Dübon <matthias.due...@ing-duebon.de> wrote: > 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 <scapr...@gmail.com> 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 >> lwip-users@nongnu.org >> https://lists.nongnu.org/mailman/listinfo/lwip-users > > ᐧ ᐧ _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users