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Configure Cisco 2611 to work with non DSL modem using a static outside IP address

Posted on 2008-11-13
Medium Priority
Last Modified: 2012-05-05
My background:
* New to the networking world
* I have used Cisco IOS and can get around pretty good
* I understand IP addressing
* Some filed experience

Ok, here's what I have.

Cisco 2611 with 10/100 BASE E 0/0 & E 0/1 Ethernet interfaces
Cisco Catalys 3500XL 48 port switch
Westell DSL modem issued by AT&T

I pretty much have a good understanding of how to configure the switch but am having problems configuring the router to access and route out to the internet. I have a statice IP address that was issued from AT&T that I need to use becuase I am hosting a Apache Web server.

If anyone can guide me step-by step, how to configure my Cisco 2611 router with a non Cisco DSL modem using a statice outside IP address, I would be very greatful. Thank you

Question by:flintstonephilly
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Accepted Solution

Don Johnston earned 1000 total points
ID: 22968183
From config mode, the following commands should give you an idea what needs to be done.

hostname Router1
enable secret <password>
int e0/0
 description internet connection
 ip adddress <address> <mask>
 ip nat outside
 no shutdown
int e0/1
 description LAN connection
 ip adddress
 ip nat inside
 no shutdown
ip route <ISP next hop address>
ip nat inside source list 1 int e0/0 overload
access-list 1 permit
line vty 0 4
 password <password>
 access-class 1 in

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Expert Comment

ID: 22974632
please, explain the line no 13

ip route <ISP next hop address>
LVL 50

Expert Comment

by:Don Johnston
ID: 22974738
This is the default route. The destination that the router will send traffic that it does not have a route for.


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Author Comment

ID: 22974948
Hi donjohnston,

Thank you very much. I actually had most of the configuration the way you explained except that I did not have line 13 the next hop or the ISP default gateway. Thanks. However, there my be one other issue. In order to use the statice IP address that AT&T gave me, I had to bridge my DSL modem which also ment that I needed to provide the PPPoE information in the router (username and password). I know how to do this with LinkSys and Netgear but not with my 2611. Can you help with this as well?

Thank you again, you've been very helpful.


Expert Comment

ID: 22979973
I have a comcast cable modem and i think i get my IP through DHCP, do i configure my 2611 in this case.

Is <ISP next hop address>, the default router of my ISP that i can see in my linksys wireless router WRT310?

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Expert Comment

by:Don Johnston
ID: 22980657

Author Closing Comment

ID: 31516646
Thank you very much for your comments. They were very helpful.

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