I am developing in C on RH9 with kernel 2.4.20-20.9 I want to write a program that receives an UDP stream and send it to another destination with the same source IP as it is received. This obviously means spoofing the source IP address. Issuing: echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind I am able to bind the socket to the foreign address (socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) But then the sendto fails with an 'invalid argument' error. I have tried the following hack: create a dummy interface with the address to be spoofed, for instance lo:1 in this case the sendto works correctly sending datagrams with the spoofed source IP ... but the recvfrom stops working and doesn't receive any datagram from that same address :-( Any suggestion on how can I do it? Thanks, Luca. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
