Are there more than only one network interfaces that are connected to the same switch/hub/router-with-multiple-ports? If so then it's an old known problem.
If you have this kind of setup then try set the "arp-filter" on. for example: echo "1" > /proc/sys/net/ipv4/conf/all/arp_filter if this doesn't help pease give more details. how does your routing-table looks like? what says: ifconfig and what entries are in your: arp table --Ralph Am Freitag 26 März 2004 17:19 schrieb [EMAIL PROTECTED]: > Hi there! > > I have found a very strange error. I have a linux box (kernel 2.4.18) to > route three nets. It connects 3 networks via ethernet interfaces. > > Network A (INTERNET) > > Net B(single LAN) -----Router-----Net C (Huge routed WAN) > > The router has NO DENY Packet filter rule, or Policy, but ip_forward is > enabled. > > The traffic from B <-> A is OK. > The C <-> A link is enabled, but unused. (route were not defined) > > The hosts in Net B can access resources in the Net C (via ip services) > When a host tries to connect from C to B, I got a strange failure: > > > The routers NetC interface receives the IP packet with its MAC address (as > destination), and the destinations IP address. > After this the packet is not viewable on any interface (nor on Interface B, > C, A). The packet has disappeared without any track. > Tcpdump, ethereal sees the incoming packet, but the packet filters (INPUT, > FORWARD) counters don't. > > What is it? > > Rob
