Date: Fri, 19 Sep 1997 10:53:18 +0930 From: Greg Lehey <grog@lemis.com> To: Alex Weeks <Alex_Weeks@capitalland.com> Cc: "'freebsd-questions@freebsd.org'" <freebsd-questions@FreeBSD.ORG> Subject: Re: I don't understand static routes afterall Message-ID: <19970919105318.48856@lemis.com> In-Reply-To: <01BCC41C.F85A7F20@cutthroat>; from Alex Weeks on Thu, Sep 18, 1997 at 10:23:54AM -0500 References: <01BCC41C.F85A7F20@cutthroat>
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On Thu, Sep 18, 1997 at 10:23:54AM -0500, Alex Weeks wrote: > Well, just about the time I thought I new what I was doing I encountered > the following. If anyone feels like explaining what's going on I would be > interested. > > I have three subnets. I have a FreeBSD machine routing between subnet a > and subnet b and another FreeBSD machine routing between subnet b and > subnet c. The is necessary because the physical setup prevents one machine > from connecting to all three subnets. Let's call the machine that sits > between a and b machine A and the machine that sits between b an c machine > B. > > In order to get subnet a to talk with subnet c I needed to include a static > route in A. The static route should say something like "route all traffic > for subnet c through <hostname> on subnet b" where <hostname> physically > resides in machine B. > > Let me put numbers to it. > Subnet a is 192.1.1.0 > Subnet b is 192.1.2.0 > Subnet c is 192.1.3.0 > > I should have been able to accomplish the above with "route add -net > 192.1.3.0 -interface 192.1.2.1" assuming 192.1.2.1 is the 192.1.2.0 > interface in machine B. > > But this didn't work. What's wierd however is that it did work to enter > each hostname in invididually! I litterally typed > route add 192.1.3.1 192.1.2.1 > route add 192.1.3.2 192.1.2.1 > route add 192.1.3.3 192 1.2.1 > etc....... for the entire subnet. Now it's working fine. > > Have I made a glaring error? Do I completely misunderstand subnets and > routing? It would be nice to see the output of netstat -r and possible netstat -a. Greg > In real life these are 27 bit class c subnets but that shouldn't matter for > the example. I did include a "-netmask" statement in real life but it > wouldn't make sense for this example. Just possibly it would. I've seen some bugs in this area when the tables get big. Greg
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