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Router Setup Help

o0JoeCool0o
o0JoeCool0o asked
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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?


 
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