gateway/routing questions

[Alex de Kruijff]

On Fri, Nov 07, 2003 at 02:25:11AM -0700, Chad Leigh -- Shire.Net LLC wrote:
> I used to have a situation like this but it was a few years ago and I 
> have forgotten how to set this up in detail.
> 
> I have a class C network (public) and I have a FreeBSD box with lots of 
> aliases on it providing various services.  There is also a Mandrake 
> Linux box that belongs to a customer sitting on my net as well.  My 
> provider where I am colocated provides the gateway for my class C in 
> his fancy shmancy switch :-) .
> 
> I want to add another box (a Linux one unfortunately for some high 
> performance Java 1.4 stuff that won't run on FreeBSD) but I want to 
> make it so that it is on a private class C that should co-exist with my 
> regular class C.
> 
> Lets say my public one is (this is made up) 128.1.1.0.  This is where 
> the FBSD box lives.  I want to overlay 192.168.1.0 on my LAN.  I will 
> give my FBSD box the address (alias) of 192.168.1.1 .  The new Linux 
> box will have a bunch of addresses starting at 192.168.1.10 .
> 
> The Linux box on the 192.168 network should not have any access going 
> out (so I don't need NAT for example) nor of course coming in.  But the 
> FBSD box should continue to have its normal public access on 128.1.1.0 
> network plus access the Linux box on 192.168.  The Linux box should be 
> able to talk to the FBSD box.
> 
> I think that all I need to do is add an alias address (and a static 
> route out the ethernet port?) to my BSD box and it should work.   I 
> don't need anything else to have the BSD box live in this private 
> network as well as the public one, since the private network does not 
> need to get out at all.
> 
> Is this reasoning correct?  In my test lab here I cannot recreate this 
> exactly given some restrictions on how it is set up and so when I go 
> and take the Linux box and stick it in the data room on Friday it  
> needs to work without lots of trouble :-)

You don't need static route at all. You only use this when you default
route doesn't apply. This doesn't apply to you since you only have
traffic on your 192.168.1.0/24 network. So all you need is an alias.

-- 
Alex

Articles based on solutions that I use:
http://www.kruijff.org/alex/index.php?dir=docs/FreeBSD/