I am cutting and pasting the following lines from ip.c. They show how the IPOutgoingPacket() routine detects the source address of the router. Remember the source address of the router is dependent on the interface that is being used to push the packet out.
verbose(2, "[IPOutgoingPacket]:: lookup next hop "); // find the nexthop and interface and fill them in the "meta" frame // NOTE: the packet itself is not modified by this lookup! if (findRouteEntry(route_tbl, gNtohl(tmpbuf, ip_pkt->ip_dst), pkt->frame.nxth_ip_addr, &(pkt->frame.dst_interface)) == EXIT_FAILURE) return EXIT_FAILURE; verbose(2, "[IPOutgoingPacket]:: lookup MTU of nexthop"); // lookup the IP address of the destination interface.. if ((status = findInterfaceIP(MTU_tbl, pkt->frame.dst_interface, iface_ip_addr)) == EXIT_FAILURE) return EXIT_FAILURE; // the outgoing packet should have the interface IP as source COPY_IP(ip_pkt->ip_src, gHtonl(tmpbuf, iface_ip_addr)); verbose(2, "[IPOutgoingPacket]:: almost one processing the IP header."); You can use the "find*" functions to detect the iface_ip_addr -- which is what you are looking for. Hope this helps. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Arin Soyen Sent: November-07-08 1:50 PM To: [EMAIL PROTECTED] Cc: email@example.com Subject: [gini] Acquiring Interface Source Address of Router Hello, We are having trouble finding out how we should acquire the interface source address of a router. Could you explain how we can do this? Thanks, Arin_______________________________________________ gini mailing list firstname.lastname@example.org http://mailman.cs.mcgill.ca/mailman/listinfo/gini _______________________________________________ gini mailing list email@example.com http://mailman.cs.mcgill.ca/mailman/listinfo/gini