Hello, I have a multi-homed host with two interfaces: eth0: 10.0.0.1 and a virtual interface eth0:0 10.0.0.101. What I'm trying to do is send a broadcast packet to 10.0.0.255 using the virtual IP as the source address(since both IPs are on the same network). Currently, when I create the destination broadcast socket and send some data, tcpdump shows the source IP to be 10.0.0.1. But I need the source IP to be 10.0.0.101! Why I need to know: I'm writing a linux client app that updates name-to-IP address mappings for a commercial server. The problem is that if the IP address encapsulated in the message doesn't match the src ip address within the IP header, the packet is rejected(suspicion of spoofing). Now I know it's quite possible to change the src ip of an outgoing packet in kernel space, but I'm perplexed on how to do this from user space. I've RTFM a lot, and the man pages, though If anyone can provide more information or guidance, it'll be greatly appreciated. Thanks, Kashif Shaikh -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
