General discussion

Locked

TCP/IP Routing

By kbrogan ·
My first posting here. Hope it is in the right spot.
I have been supporting a real estate company that has 2 offices. Initially, both offices were fed the Internet thru 56k Lan Modems. One for each office. Then we upgraded the primary office to DSL. In addition, we connected the 2 offices with a full T1 so that some of the workstations at the second office could talk to the NT server at the primary office.
What I would like to do is route the DSL Internet connection thru the T1 but this seems to be more difficult than I thought. Our primary office network workstations are assigned 192.168.1.xx IP addresses. The secondary office workstations are assigned 192.168.2.xx IP addresses. The T1 Cisco routers are assigned 192.168.1.5 and 192.168.2.5 at the appropriate office.
Can someone suggest an answer or an Internet location for an answer?
Also, let me know if I should post more details.
Thanks
Kevin

This conversation is currently closed to new comments.

4 total posts (Page 1 of 1)  
| Thread display: Collapse - | Expand +

All Comments

Collapse -

TCP/IP Routing

by -Q-240248 In reply to TCP/IP Routing

Assuming you're using NAT on the DSL router, the T1 router at the primary site should be give a default route (gateway) pointing to the DSL router. Your two Cisco routers should have some kind of routing protocol running on them or static routes.Hopefully all of your routers are from the same vendor: Cisco.

Collapse -

TCP/IP Routing

by tbradley In reply to TCP/IP Routing

If as you say, both offices have a full T-1 connection, the solution is pretty simple.

1. Find an ISP that accepts T-1 connections.
Usually, the provider of the T-1 service
does this also.

2. Have the ISP/T-1 provider etc setup a PVC
between the two offices, and open up
internet access via the primary office.

3. Dump the DSL, as it is now redundant, and
is no longer needed.

essentially, what you will have is the router at the primary office that is tied to the internet. It acts as the default gateway, and connects to a DNS, for example bellsouth.net with a dns entry of 205.152.0.20

It, for all workstations at the Pri site, is the default gateway, xxx.xxx.1.5, and subnet 255.255.255.0.

Sites at the secondary site connect to both the internet, and the primary site through their router, using same subnet, but with a default gateway of xxx.xxx.2.5.

Collapse -

TCP/IP Routing

by tbradley In reply to TCP/IP Routing

You say the T-1 connects the two buildings, that IS my point, as T-1's do not operate in a vacumn, that is a stand alone, without being sent through a central PSTN facility.

They are provided by a telecommunications vendor, ie Bellsouth, bellatlantic, etc. These vendors can "bend" the pipe a little, and open a hole to the internet through your central office Cisco router.

If, and I've never heard of it being done as you describe, the T-1's are providing a PHYSICAL, ie a cable is strung from building to building, you are paying big dollars for a 1.5mps connection that would be better served by Category 5 or Fiber.


e-mail me direct if you want some more details, but I'm sure I'm on the right track here, just at a loss of how to describe frame relay works in 20 words or less.

Collapse -

TCP/IP Routing

by kbrogan In reply to TCP/IP Routing

RE:
Assuming you're using NAT on the DSL router, the T1 router at the primary site should be give a default route (gateway) pointing to the DSL router. Your two Cisco routers should have some kind of routing protocol running on them or static routes.
Hopefully all of your routers are from the same vendor: Cisco.

----Both routers are Cisco and I'm sure they have a routing protocol but Ameritech set up the T1 & its routers so I not familiar with how that works.

RE: If as you say, both offices have a full T-1 connection, the solution is pretty simple

---The T1 connection (singular) is between the buildings. I didn't mean to make it seem like those T1 connections were to the Internet.

Any more thoughts or am I misssing it?Hope this adds to your knowledge base :)

Thanks
Kevin

Back to Networks Forum
4 total posts (Page 1 of 1)  

Hardware Forums