[lug] Routing with Linux
DBonnell at BreeceHill.com
Thu Jun 29 16:12:10 MDT 2000
Forwarding is needed, but I would think that ipchaining would be
nice to use also.
I don't have the exact syntax handy, but if net1 is on Linux eth0
and net 2 is on Linux eth1, then:
ipchain FORWARD 188.8.131.52/40 eth1 (net1 forwarded to net2)
ipchain FORWARD 184.108.40.206/37 eth0 (net2 forwarded to net1)
This saves telling all the machines where packets need to go. You'll
need routing at the individual machines on each net.
route add -host finkel -gw rupert (finkel on net2, rupert = net1
route add -host narn -gw turtle (narn on net1, turtle = net2
First example for a machine on net1 needing to get to finkel on net2.
Second is for a machine on net2 needing to get to narn on net1.
I think of this more as a bridge than a router since it links to subnets
rather than a single connection to a subnet.
Hope this helps,
> -----Original Message-----
> From: Sean Reifschneider [SMTP:jafo at tummy.com]
> Sent: Thursday, June 29, 2000 3:51 PM
> To: lug at lug.boulder.co.us
> Subject: Re: [lug] Routing with Linux
> 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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