From owner-freebsd-stable Tue Apr 6 4:27:29 1999 Delivered-To: freebsd-stable@freebsd.org Received: from volodya.prime.net.ua (volodya.prime.net.ua [195.64.229.17]) by hub.freebsd.org (Postfix) with ESMTP id B6EFD15067; Tue, 6 Apr 1999 04:26:22 -0700 (PDT) (envelope-from andyo@prime.net.ua) Received: from prime.net.ua (localhost.prime.net.ua [127.0.0.1]) by volodya.prime.net.ua (8.8.8/8.8.8) with ESMTP id OAA00643; Tue, 6 Apr 1999 14:29:32 +0300 (EEST) (envelope-from andyo@prime.net.ua) Message-ID: <3709F019.6B2D651C@prime.net.ua> Date: Tue, 06 Apr 1999 14:29:30 +0300 From: "Andy V. Oleynik" Organization: M-Info X-Mailer: Mozilla 4.5 [en] (X11; I; FreeBSD 2.2.7-RELEASE i386) X-Accept-Language: ru, uk, en MIME-Version: 1.0 To: cjclark@home.com Cc: andrea.franceschini@linet.it, freebsd-stable@FreeBSD.ORG, freebsd-current@FreeBSD.ORG, tech-net@netbsd.org, freebsd-questions@FreeBSD.ORG Subject: Re: arp. References: <199904060907.FAA26799@cc942873-a.ewndsr1.nj.home.com> Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: 8bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG "Crist J. Clark" wrote: > Andy V. Oleynik wrote, > [Charset koi8-r unsupported, filtering to ASCII...] > > andrea wrote: > > > > > I have to add a gateway to my net for experimental reasons. > > > Actually there are : a main-router that works as interface to the Internet, > > > and some hosts on my sub net. > > > > > > Internet-----MyRouter----MySubNet > > > > > > NOw i need to configure one host of MYSubNet to act as a gatway for the > > > secondary subnet. > > > Both the 1SubNet and 2 SubNEt share the same ip-range. > > > > > > Internet-----MyRouter----MySubNet-----My2SubNet > > > > As I understood U have smth like this : > > Internet-----MyRouter----MySubNet > > |----2ndRouter-----My2SubNet > I mean 2ndrouter is on MySubNet, sorrey for unclearity:) > > Then U have to cut My2SubNet from ur MySubNet and configure > > routes to appropriate subnets on appropriate hosts. As long as ur 2ndsubnet > > is part of ur mainsubnet the hosts from 2ndsubnet will be seen from internet > > > > & wise a versa. U may need to run DNS for reverse zone of ur My2SubNet > > DNS has nothing really to do with this problem. I believe the original > I said "U may" not "U must". At least I run DNS for revzones of my subnets. > poster is describing the following (this may be what the second poster > meant to write, but proportional fonts, tab damage, or his character > set wiped it out), > > Internet------PrimaryRouter------SubNet1 > | > SecondaryRouter-----SubNet2 > > > > > > > > > > All the sub.net have to be seen from the Internet so I'll need to add a > > > route to MainRouter in order to route the Secondary Subnet. > > > The problem is that i cannot change configuration of the mainroute,so i > > > > > > > in fact this isnt big problem as soon as U have properly configured > > subnets:) . Correct me if I wrong. > > This is a problem. You are wrong. But back to the original poster, why Sorrey Crist, but there is no need to connect 2nd router to 1st. If U have to have 2nd subnet just insert 2nd NIC into 1st router and as I sad above configure ur subnets (with appropriate routes on router off cause & defaulterouter on hosts on subnets :). > > can you not change the configuration on the Primary Router[0]? If this is > your network, and you want to be able to do things like this, you need > to be able to change the Primary Router configuration. > > To the second poster, when the Primary Router receives a packet > destined for a machine on SubNet1 or SubNet2, since the Router > believes all of those machines are still on its LAN, it will try to > use the MAC address (layer 2) to send the packet directly to the > Is this true if 1strouter knows that a route to 2ndsubnet is throught 2ndrouter which is on same subnet as 1strouter? > machine. However, now this machine has been moved behind the Secondary > Router. The Secondary Router is not listening for other machines' > why not if it's configured as gateway to 2ndsnet? > packets at layer 2 (in a typical router setup), so it never gets the > > packet and never tries to forward it. It also would not respond to ARP > > calls by the Primary Router when it is looking for a machine on > SubNet2. > > > > > wonder if is possible to configure the new gateway to do a sort of "proxy > > > arp" for my secondary Subnet. > > > But arp-tables are system-wide so if i change arp entry to cacth request on > > > PrimaryNet the 2subnet dont'works anymore. > > > Is possible to catch arp request only on a single subnet,without broke any > > > other subnet connected to the same host.? > > It is possible. But I am unaware of a tool to do this[1] (which does not > mean there is not one). Might you be better off building a 'new' net > behind your Secondary Router? Say using NAT and a 10.0.0 subnet? > > [0] All you need to do on the router is add a route to Secondary > Router for IPs on SubNet2. All you need is the address for the > Secondary Router and a subnet mask. > > [1] The Secondary Router would not actually be doing routing in this > case. It's acting more like a switch. You did not really tell us why > you are doing this. Would getting a switch be a better option for you? > -- > Crist J. Clark cjclark@home.com -- WBW Andy V. Oleynik (When U work in virtual office U have good chance to obtain virtual money ö%-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message