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T1 Point to Point connection

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by bsl

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I have a point to point T1 line from one location to another. They both have a cisco router on each end. I was asked to install a firewall on a dsl connection so they can create a VPN and get out to the internet because there is no internet connection on the point to point T1 line. The main office has the internet connection but the remote office does not. All 3 Windows servers gateway point to the point to point T1 router instead of the dsl connection. How can I get at least one server on the dsl gateway without messing up the point to point connection? I need to point the servers towards the dsl connection which has a sonicwall on the dsl. The client does not want to spend any money on anything except for tech time to get it working with what they have. The remote office does not have any access to the internet.

9 replies

by cg it

tricky.

first, what Cisco router? and once we know that we'll know what ports are on it besides a WAN serial DTE/DCE.

second, whats the Leased T1 leased line for?

third, what servers are they? DNS? DHCP? WINS? RRAS? Exchange?

fourth, why do you need to point a server at the DSL connection [ which is you answer # 3 then might be apparent]

fifth, how many routers are available?

depending upon what Cisco router you got there, you can direct traffic with it. If its got 2 AUI ethernet ports along with the 2 serial, you can tell the router to direct certain traffic, requests out through the serial, and other traffic through the ethernet. the serial is usually the WAN [slow] link with the AUI ethernet ports connecting to segments, but if your tricky enough in programming the paths, you can direct the ethernet traffic to another router [specify that router in the Cisco route table as a static path 0.0.0.0 gateway for certain traffic like HTTP.

by bsl

Answer to your questions:

1. 2 1721 Cisco Routers
2. T1 is for the point to point connection
3. The servers are Windows 2000 and they have DHCP and DNS
4. The Servers need to get out to the internet for Symantec updates.
5. 2 routers for each location

I hope that answers all your questions to find me a solution.

by bfilmfan

I have a more basic question, why don't you simply add an additional gateway in the DNS settings on the Windows servers that points at the DSL router?

by cg it

ok, symantec live updates. you running the Corporate version?
The 1700 series are access routers. If you can fit it in there along with a second LAN ethernet port you'll need a WIC-1/DSL module in one of em.

If your running symantec Corporate version you really dont need one of your DNS servers to have internet access. You can create a "server" [generic name] that will host the definitions and from which all other computers will pull from. That computer doesn't need to be a server. Its called one cuz it will serve up the definitions but it doesnt need server software running.

If you run a 1700, then just create a static route for http traffic to go through the DSL port. you can get symantec antivirus definitions via http or you can do ftp if you want.

by bsl

The static route would go on the Cisco Router correct? What is the command for that route. Do you know?

by cg it

yes its on the router but the host computer that will store the antivirus definitions has to have a static IP address. you should view the routes you have before undertaking editing the routing table. global command: show ip route

If you don't know how to configure the router and work with the IOS I suggest you don't. Cuz you can muck up the entire works.
Do a global command show ip route to see what the routing table is.
global command show interfaces will show you how your interfaces are currently configured or you can do a global command show running-config

copy and paste the info including the running config [change the IP addresses] here . Like I first said, kinda tricky configuring the router[s] unless ones done it a lot.

by cg it

heres the command to establish a static ip router if your using classless routing.

config term global command: ip route this establishes a static route. BUT I caution that a default network candidate needs to be established and I would recommend that you get a dumb computer for hosting the antivirus stuff and use host routing on the 1700 which will have the DSL connection.

by orval.thompson

In windows 2000 you can add a second Ethernet gateway, so you would add the sonicwall as a second gateway, maybe out the two gateway in your DHCP setting. I am using the same setup, two offices, Point to point connection one T1 Internet connection at the main office. The main office T1 internet goes to a sonicwall firewall, from the firewall to a LAN cisco switch, the second router for the point to point is also plugged in the LAN switch all machines in the remote office are using the router at the remote office at their gateway, but the DNS and WINS server address are at the main office. Important: You must configure a rout in the firewall to allow traffic from the other subnet at the remote site.

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