We help IT Professionals succeed at work.
Get Started

Router Setup Help

o0JoeCool0o asked
Last Modified: 2010-04-21
Hey Guys! I've switched ISPs and I'm having a little trouble with NAT. I have a cisco 1841 and the setup is as follows.
The WAN port of the router has the ISP's IP on it (206.212.x.x - it's part of their subnet - and next hop is their router on the same subnet) and the LAN port has our Public IP assigned to it. (72.68.x.x)
They set it up this way because they aren't technically an ISP; their network ties into ISP's and load balances accordingly. (At least that's what I'm told).

They way I'm used to having things setup is to have our WAN IP on the WAN port and on the LAN port our LAN ip range (10.10.x.x). This makes NAT and overloading easy because you only have to specify NAT inside and outside ports and build your NAT and ACL tables accordingly.

  Basically; I want to keep our internal subnet (10.10.x.x); and I would like to keep our servers with the same internal IPs. Right now Im using NAT with overloading to do our translation to various services. I just dont know how to set it up on the new cisco; because you have to specify nat inside and outside interfaces and usually the external interface would be one of our IPs (72.28.x.x) and wed set our internal one up as 10.10.x.x. As it stands the external interface is 206.212. .. etc. Any help?

Watch Question
This problem has been solved!
Unlock 1 Answer and 7 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE