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

Posted on 2008-11-13
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
    LVL 50

    Accepted Solution

    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

    Open in new window


    Expert Comment

    please, explain the line no 13

    ip route <ISP next hop address>
    LVL 50

    Expert Comment

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


    Author Comment

    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

    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?

    LVL 50

    Expert Comment

    by:Don Johnston

    Author Closing Comment

    Thank you very much for your comments. They were very helpful.

    Featured Post

    How to improve team productivity

    Quip adds documents, spreadsheets, and tasklists to your Slack experience
    - Elevate ideas to Quip docs
    - Share Quip docs in Slack
    - Get notified of changes to your docs
    - Available on iOS/Android/Desktop/Web
    - Online/Offline

    Join & Write a Comment

    This article will cover setting up redundant ISPs for outbound connectivity on an ASA 5510 (although the same should work on the 5520s and up as well).  It’s important to note that this covers outbound connectivity only.  The ASA does not have built…
    Getting hacked is no longer a matter or "if you get hacked" — the 2016 cyber threat landscape is now titled "when you get hacked." When it happens — will you be proactive, or reactive?
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    733 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    24 Experts available now in Live!

    Get 1:1 Help Now