RE: OT: Back-to-back DSL router config
- From: "Philip Clark" <pclark@xxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 15 Jun 2005 18:35:28 -0500
It sounds like you need to tell the 3COM router (The one in the server room)
where the internet is.
You can do this by building a routing table on the 3COM (In the server room)
Not sure about the 3COM commands, but this is what it would look like from
an MS routing table assuming class A on all networks.
route add 100.0.0.0 mask 255.0.0.0 200.0.0.1 ---- This tells the router
to send any packet destined for the 100.x.x.x network to the 200.0.0.1
gateway
route add 0.0.0.0 mask 0.0.0.0 10.0.0.97 -- This is a route of last resort,
in other words, if you have not specified previously where this packet
should go, then send it to the cisco (aka Internet)
You will also need to make 2 changes on the Cisco
1.) Change your access list to allow the 100.x.x.x to pass through NAT as it
is probably only expecting 10.x.x.x
2.) You will need to add a route on the Cisco so it can return packets back
to the 100.x.x.x network ROUTE 100.0.0.0 mask 0.255.255.255 200.0.0.2 (I
think that is proper Cisco speak)
Hope that helps
_____
From: Amy Babinchak [mailto:amy@xxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, June 15, 2005 3:05 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] OT: Back-to-back DSL router config
http://www.ISAserver.org
Back in 2001 I setup back-to-back DSL routers for a couple of clients that
had really long runs through manufacturing environments to extend the
network to the back of the shop. Now I need to change the Internet gateway
from the server to another router on the network. I was apparently smarter
back when I first configured these routers but having not configured a
router since, I can't seem to get it to work. The computers at the end of
this DSL line have access to the server but not the Internet. The routers
are 3COM 840's but as I recall they take pretty much the same commands as
any router.
I'll attempt a little diagram:
100.0.0.1 Router at back of plant 200.0.0.1 -------> 200.0.0.2 3COM Router
in server room 10.0.0.7
----> Switch ----Server 10.0.0.80
--- Cisco Router 10.0.0.97
The 200.0.0.1 - 200.0.0.2 part is the actual DSL connection internal the
routers.
The Cisco router is going to send them out to the Internet.
The server has data and apps that they also need access to.
The clients need access to both.
Amy
Harbor Computer Services
Small Business Computer Specialists
Client Blog: http://smalltechnotes.blogspot.com/
Tech Blog: http://isainsbs.blogspot.com/
Help: http://helpdesk.harborcomputerservices.net/
Website: http://www.harborcomputerservices.net/
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