Andre Bender zei: > Hi, > > for a mobile application we are using multiple internet connections > (mostly ppp) to achive a high aviability. Normaly there are at least two > open connections (e.g. eth0 and ppp0). Assuming the default route is > set correct for use with eth0. > > The software I'm writing is opening various sockets and binding them to > the devices. Sending via eth0 is working flawlesly but sending via ppp0 > does not send at all. .... > My Question is: How do to setup route/iptables so a packet sent via a > socket bound to eth0 is sent via eth0 and a packet sent on ppp0 is sent > there? > I guess it has something to do with source routing but I couldn't figure > out from the examples found on the net. I wasn't aware that one could bind a socket to an interface. I think you mean that you bind the socket to the same address as the interface is bound to. Sending packets works as follows: - A local address is assigned if one wasn't assigned yet (in your case you did assign an address) - The packet is routed based on the destination address and the routing table. So sending to 192.168.202.1/32 will use ppp0, all other packets will use eth0. More importantly, what do you want to achieve? It's not completely clear from your description. HTH, M4
