[lug] Routing with Linux

Stephen G. Smith ss2chef at hotmail.com
Thu Jun 29 16:14:03 MDT 2000

Thanks Sean..
Now to add to the problem..
Both network 1 and network 2 already have a default gateway that I can't

The users on network 1  use a travel booking service (router1)
and if they need internet access they go out through a DSL connection

The users on network 2 use a different travel booking service(router3)
and will want to use (router2) for internet access.

Is there a need to use more than one router or is putting routing
rules at each workstation the best bet..
I may have limited access to routers 1 and 3



>On Thu, Jun 29, 2000 at 09:43:46PM +0000, Stephen G. Smith wrote:
> >Network 1 is a 35 node public static IP network
> >Network 2 is an 8 node public static IP network
>No problem.  Simply take a Linux machine with two interfaces, and plug
>one into each network.  Assign IP addresses to each interface, and
>enable packet forwarding on that machine.  It's now acting as a
>router between them.
>Now you just have to tell the 35 machines on net1 that any packets
>destined for net2 go to the IP address of the Linux machine's
>interface on their network, and the converse for the machines on
>Or, if you have a router that's acting as your default gateway
>(connection to the internet most likely), you can tell it to
>do the forwarding so you don't have to change routing on all the
>other machines.
>  ISA isn't dead, it's just that people wish it were.  The correct term for
>  this condition is "legacy"...  --  Sean Reifschneider, 1999
>Sean Reifschneider, Inimitably Superfluous <jafo at tummy.com>
>tummy.com - Linux Consulting since 1995. Qmail, KRUD, Firewalls, Python
>Web Page:  http://lug.boulder.co.us
>Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug

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