RE: OT: Back-to-back DSL router config
- From: "Amy Babinchak" <amy@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 15 Jun 2005 20:05:57 -0400
That should be enough to get me started. Reading your email has started
to break up the rust in the router area of my brain.
Thanks,
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/
________________________________
From: Philip Clark [mailto:pclark@xxxxxxxxxxxxx]
Sent: Wednesday, June 15, 2005 7:35 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Back-to-back DSL router config
http://www.ISAserver.org
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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