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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!tezcat!gail.ripco.com!news.wwa.com!chilton!chris From: chris@vindaloo.com (Christopher Sean Hilton) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Ip's and ifconfig Date: Sun, 5 Jan 1997 18:25:23 GMT Organization: Vindaloo Communications Lines: 38 Message-ID: <E3JsIC.639@vindaloo.com> References: <32CCF094.41C67EA6@corpex.com> <5ak1kq$ge6@uriah.heep.sax.de> <5amee7$7qv@Symiserver2.symantec.com> NNTP-Posting-Host: pool19-018.wwa.com Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:33660 In article <5amee7$7qv@Symiserver2.symantec.com>, <tedm@agora.rdrop.com> wrote: >In <5ak1kq$ge6@uriah.heep.sax.de>, j@uriah.heep.sax.de (J Wunsch) writes: >>Neil Fowler Wright <neil@corpex.com> wrote: >> >>> If we have several machines on our network (Ie sames class C >>> block from the same hub and router), all with the clients having >>> root priviledge. How do we stop a client from allocating the ip >>> number of another clients machine, or for that matter any other IP >>> number in that Class C block. >> >>By hiring an administrator. >> > > This doesen't work, they still will do it! > > One thing you can do to screw the fuckers is to re-program your > routers to ignore ARP's, put in a static ARP table, then go to your > hub (assuming it is intelligent enough) and lock out foreign MAC > addresses. That way, when they do it they won't get any packets > back. Of course, this is much more labor intensive since you have > to do everything manually, and a real pain in the ass, but if you > need to keep some smart guys out there from screwing your network > over behind your back it is possible. If in addition to this you used DHCP to hand out your IP addresses based on the MAC address then you'd be all set until they starting swapping ethernet cards. Chris -- +--------------------------------------------------------------------+ | __o "All I was doing was trying to get home from work." | | _`\<,_ -Rosa Parks | +_(*)/_(*)___________________________________________________________+