need help with seperating two networks and using 1 DSL line

[TiggerDaKat]

We have two offices next to each other, both running wireless. The goal is to be able to keep each network completely seperate from each other (don't even want to ping each other), but still share a single DSL line. What would be the best configuration for this?

We've thought about finding a router with two backend ethernet ports assigned different subnets and the public side plugged into the DSL line. We also need a firewall however.

Any advice would be greatly appreciated.
Thanks


Eric

 

[CaMedic]

More information is needed. If you have a block of static public addresses, it is a non issue, put in a hub and allow each network to put in thier own firewall and infastructure running off of one of those public addresses.
However, if you went on the cheap and orderd a line with one dynamic ip address. you just made things more complex. One way is to do a Double Nat. Using somthing like a linksys cablemodem dsl router with anoter two linksys cablemodem dsl routers behind that, or a router such as a cisco with 3 ethernet interfaces (Minimum would be a 2600 Series).

If you have the ablity to get a block of static addresses from your upstream, then your life is set.

Have Fun.

 

[TiggerDaKat]

I think that solved the problem completely.
Getting two ip addresses from the isp makes it so much easier. I never even thought of that.
We can install two linksys routers behind the DSL modem and seperate each network by different subnets. Then we can run NAT behind each one and they wouldn't be able to see each other. Thanks so much for the help!!!

Eric

 

[oj88]

You just need a single router with two ethernets and a WAN link to the DSL line. Use NAT then add access-lists to prevent network A from gaining access into network B and vice versa. Orlando Palomar Jr
CCIE# 11206, CCNP
CIPT Operations Specialist
Phil-Data Business Systems, Inc.