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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!doc.ic.ac.uk!uknet!cf-cm!paul From: paul@myrddin.isl.cf.ac.uk (Paul) Subject: Re: SLIP network problem Message-ID: <1993Oct9.051546.6674@cm.cf.ac.uk> Keywords: SLIP, routing Sender: news@cm.cf.ac.uk (Network News System) Organization: Intelligent Systems Lab, ELSYM, University of Wales, Cardiff References: <293qla$ect@dlsn31> <kd.750099708@laotzu> <1993Oct8.192453.19322@emba.uvm.edu> Date: Sat, 9 Oct 1993 05:15:45 +0000 Lines: 40 In article <1993Oct8.192453.19322@emba.uvm.edu> wollman@aix5.emba.uvm.edu (Garrett Wollman) writes: >In article <kd.750099708@laotzu>, Kostis Dryllerakis <kd@doc.ic.ac.uk> wrote: >> The problem can be more generally put as: what do you need >> to do when you connect to a machine on a subnetwork A.B.C as >> part of the same subnet (e.g. get assigned A.B.C.yoU) in order >> to see the rest of the subnetwork (from the side of the machine >> you connect to maybe?) > >You can't. Some other systems support a hack which allows you to make >this ``work'', but doing so definitely voids your warranty as far as >correct network operation goes. > >Now that that's out of the way, here's what you can do (given the >caveat that I STRONGLY recommend against doing this, and instead do it >properly as IP was designed to operate): > >- Make sure that your kernel is compiled with the GATEWAY option. You >should probably also compile with SENDREDIRECTS set to zero, since >Net/2 doesn't even come close to meeting the Router Requirements. > >- When the point-to-point link is up, you can do > arp -s remote.ip.add.ress yo:ur:et:he:rn:et pub > >on the well-connected host, and this will cause that host to proxy ARP >for the other. > Hmm, I'm not 100% clear what you're suggesting but in general proxy ARP won't work on gateways with *BSD. If you add an arp entry for the well connected side it will catch packets for the proxy address but it won't send them out the other side because the arp table says to catch them! What's needed (and exists in those OS's that can do this) is a private arp table for each interface. -- Paul Richards, University of Wales, College Cardiff Internet: paul@isl.cf.ac.uk JANET: RICHARDSDP@CARDIFF.AC.UK