Greetings I put a question mark at the end of the subject line because I'm not sure if the problem I have is to do with routing or not... First of all, define the problem. I'm using the tun driver within an application that opens a tunnel and reads encapsulated data from the tunnel, munges it about (as applications do!!) and then sends the reply back down the tunnel. So far, I can open the tunnel and read data but the send data seems to just disappear. Looking at ifconfig I see the send packet count and the send byte counts increment but nothing traced on my wireshark monitor:-( I've so far tried 3 methods of handling the IP/IP encap data, all of which have problems - the tun driver is what I'd prefer. 1. a raw-ip socket opened with a protocol value of 4 (IPIP encap type). This receives and transmits the data OK but it appears that the socket is not an exclusive listener because the encap'ed packets result in ICMP messages being returned to the originator of the tunnel. 2. opening a socket and then doing an SIOCADDTUNNEL ioctl on it to create a tunnel. There are no failures but my application doesn't receive any data so it never sends anything!! ifconfig indicates RX packets and data count but no idea where they go! 3. using the tun device as per the example in tuntap.txt. This is the one that receives but doesn't transmit. I have notices that 'ip link' reports that the encap type is ppp but I haven't found a way of changing that yet. I've spent over 100 hours on this now, I seem to have read the iproute2 and iptables code a dozen times but still no further in understanding what is going on... -- Robin Gilks zl3rob/g8ecj Internet: g8ecj@xxxxxxxxx http://www.gilks.org -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
