Path: utzoo!attcan!uunet!mcvax!inria!imag!richier From: richier@imag.imag.fr (Jean-Luc Richier) Newsgroups: comp.protocols.tcp-ip Subject: gateways and more-than-one-IP-net on one ethernet Message-ID: <3059@imag.imag.fr> Date: 6 Jun 88 10:22:43 GMT Reply-To: richier@imag.imag.fr (Jean-Luc Richier) Organization: IMAG, University of Grenoble, France Lines: 45 I have a problem with the 4.3 version of TCP-IP, when I use both gateways and multiple nets on one ethernet. Description: I have a ethernet LAN which contains 2 IP networks (In fact, it consists of two ethernet networks, interconnected with Level 2 Bridges). There is also a gateway on the LAN, which provides acess to a third network. The structure is as follows (with arbitrary IP numbers): etherLAN IP-net-A(192.0.0.xx) IP-net-B(192.0.1.yy) --------------------------+--------------------------------- | Gateway (addr 192.0.0.1, dstaddr 192.0.2.1) | | Gateway (addr 192.0.2.2, dstaddr 192.0.0.2) --------------------------+--------------------------------- etherLAN IP-net-C(192.0.2.xx) The machines on IP-net-A use the route commands: route add network IP-net-B0 route add network IP-net-C 192.0.0.1 1 The machines on IP-net-B use the route command: route add network IP-net-A 0 The problem is that I cannot access the net IP-net-C from machines on the net IP-net-B: The route command route add network IP-net-C 192.0.0.1 1 is refused, with the message "network is unreachable" I have been unable to solve this problem with route, routed, or even by using the "arp -s" command (trying to use proxy arp). About 6 months ago, some persons in netland (in comp.protocols.tcp-ip) suggested the idea of declaring more than one ethernet interface, in order to solve the problem of more than one net on a LAN, each with subnet and non standard broadcast addresses. I have been unable to implement this solution (on Vax or Sun, these interfaces do not configure, and therefore ifconfig does not work). Is there any solution? I can think of many, but they all ask for modifications in the kernel source. I hope that there is simpler solutions. ------------ Jean-Luc Richier richier@imag.imag.fr or richier@imag.UUCP or uunet.uu.net!imag!richier