Setup of Cisco 1721 T1 Router LAN Interface
Posted on 2003-03-28
I'm relatively new at programming Cisco routers, I can stumble through it but that doesn't seem to stop my boss from sending me to clients to program them. I have no "official" training on it, just intuition and some limited experience.
Our current client has a 1721 (IOS v 12.2)with a T1 WIC. They will have a Web server and VoIP unit as well that I need to pass certain ports through to.
The specs are as follows as provided by the ISP:
Serial IP Info
WAN Default Gateway 18.104.22.168
Customer serial IP 22.214.171.124
Ethernet IP Info
Public LAN Network 126.96.36.199/29
Usable Public IP's 188.8.131.52 - 184.108.40.206
The rest just has to do with name servers, etc. which I am familiar with adding.
My first question is, what is the proper setup for the LAN side of the router? I can ping Internet addresses from the router command line so the serial interface is OK. Am I correct in assuming that the Ethernet interface IP Address is going to be 220.127.116.11? (I then assume this will serve as the LAN client's gateway address for clients in the range of .217 to .222?)
Second, they will have a web server with only ports 80, 1080 open at at 18.104.22.168
Third, they will have a VoIP unit that will need only ports 1720,1721 and 30000-30011 open at 22.214.171.124
How do I accomplish this? With NAT? I don't think it's that difficult but having not been exposed to it for too long, it's got me stumped. I have some ideas but experimenting on their dime isn't an option!
Thanks in advance for ANY assistance!!
If anyone feels like giving me a sample config, all the better!