I have been working on a few Linux boxes that have fddi cards that need to be transmitted to an ethernet network. Someone else wrote a script that opens a socket, reads it, sorts the data and retransmits on another interface. But when he opens the socket it reads in nothing. The interface is up, a packet sniffer shows that I am getting packets on the appropriate ports, in udp broadcast as expected. But I suspect that multicasting or unicasting attempts by Linux is messing it up. I’ve reinstalled, tried limiting all other protocols and minimized services, including disabling multicasting via ifconfig and protocols. I even rebuilt the kernel to remove superfluous protocols, but to no avail. The people who worked on this before claim it worked with older Linux, when the fddi modules were being worked on, but I cannot go back further than 7.0 on Suse or Redhat or else I will have compiler dependency problems. The source code has worked fine on other machines so I have not looked at it extensively, partially because of my lack of background in network programming. Essentially what the problem entails is that I am hooking up to old hardware with the fddi card incapable of anything but UDP broadcast. Any suggestions? Am I missing something major?