CISCO 2620XM and Cable Modem..

Answered Question
Apr 1st, 2007

Hello,

I have a Cisco 2620xm Router with a c2600-ipbase-mz.124-12 IOS installed....also have a NM-1FE-TX module.

I connect Ethernet0/1 to the cable modem and Ethernet0/0 to the lan.

Ethernet0/1 is getting a valid ip 65.xxx.xxx.xxx from my ISP........and ethernet0/0 has a fixed lan ip 192.168.xx.xx

Ethernet0/1 has NAT (outside) and Ethernet0/0 has NAT (inside)

I tried a static route 192.168.xxx.xxx 255.255.255.0 65.xxx.xxx.xxx ........that did not work.

I am NEW to Cisco routers so I am sure I missed something?

I get no internet access...and cannot ping the 65.xxx.xxx.xxx ip.

Any thoughts?

Correct Answer by sundar.palaniappan about 9 years 11 months ago

Your NAT config should something like this if you are trying to do NAT overload.

Router(config)#ip nat inside source list 1 interface e0/1 overload

Router(config)#access-list 1 permit 192.168.xx.xx 0.0.0.255 --> substitute your e0/0 subnet address and wild card mask here

HTH

Sundar

Correct Answer by sundar.palaniappan about 9 years 11 months ago

Assuming you have already NAT setup properly you just need a default route on the router to point to e0/1. If you already haven't configured a default route then configure the following command from config mode;

ip route 0.0.0.0 0.0.0.0 e0/1

If you are still having problems posting the full configuration would help.

HTH

Sundar

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Overall Rating: 5 (3 ratings)
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foxbatreco Sun, 04/01/2007 - 06:08

Hii,

There shouldnt be a probs with tht until dere is some mismatch in nat statements or the ip thts being applied. R u trying to do overload or jst one to one mapping of private to global ip's.Please clarify to this so tht we can help u reach the resolution of the problem.

Correct Answer
sundar.palaniappan Sun, 04/01/2007 - 06:14

Assuming you have already NAT setup properly you just need a default route on the router to point to e0/1. If you already haven't configured a default route then configure the following command from config mode;

ip route 0.0.0.0 0.0.0.0 e0/1

If you are still having problems posting the full configuration would help.

HTH

Sundar

SCORPION69 Sun, 04/01/2007 - 06:16

Thanks.....

I am just trying to map private to global...

192.168.xxx.xxx to 65.xxx.xxx.xxx

Correct Answer
sundar.palaniappan Sun, 04/01/2007 - 06:26

Your NAT config should something like this if you are trying to do NAT overload.

Router(config)#ip nat inside source list 1 interface e0/1 overload

Router(config)#access-list 1 permit 192.168.xx.xx 0.0.0.255 --> substitute your e0/0 subnet address and wild card mask here

HTH

Sundar

SCORPION69 Sun, 04/01/2007 - 07:19

Excellent.......I am now runnig thru the router...

I just updated the IOS to c2600-adventerprisek9-mz.124-11.T

So I configured the firewall....

The whole purpose of this was to BYPASS and possible eliminate the ISA SERVER...

I may try to configure the router >> ISA server.....

I just wonder if i get better performance from router only...

I only have a couple of users....

THANKS AGAIN....

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