how to connect virgin media box to cisco 2950 switch

Posted on 2014-07-16
Last Modified: 2014-07-26
hi I have a virgin media box that I normally set to 'modem/enable' that provides me with a public ip address that I usually plug into my 'isa 2006' firewall.

note:  I have not tried so I am not sure if I can setup 'cbac' as a firewall on the layer 2 cisco 2950, but presumably should be able to set this up on my layer 3 3550.

now I would like to know how to do the both:

question 1.  what do I need to set on a layer 2 switch cisco 2950 to gain internet access  ?

question 2.  as I do not know the public ip address, but I could plug a cable into a server nic card and write down the ip address that does not change for a few months at least, but how would I set that on my cisco 2950 or would I set up dhcp as the public ip address provided would still come from my isp dhcp server   ?

question 3.  what do I need to set on a layer 3 switch cisco 3550 to gain internet access  ?

note: I presume once the above can be done I would then do the following to confirm the public ip address has been detected :

- sh ip int brief
Question by:mikey250
    LVL 44

    Accepted Solution

    If you use the Virgin box in modem mode a 2950 or 3550 would be no good here... you would need to use NAT somewhere and neither of these switches does NAT.

    You can't use CBAC on these either.
    LVL 57

    Assisted Solution

    by:Pete Long
    Craig is spot on - I'm a virgin media customer as well, my home hub is in 'Modem' mode, I have an ASA5505 behind it performing those functions, your cheapest bet would be a cisco 800 series router. if you go down that route here's how to config the router.


    Author Comment

    hi petelong,

    I have purchased from ebay a: asa5505
    LVL 57

    Expert Comment

    by:Pete Long
    Good man! There's a ton of ASA articles on my site (link above) if you get stuck :)

    Author Closing Comment

    apologies my internet has been down for a week and only received my router from my isp this morning.  I did not see the (asa articles) but thanks for the advice.

    Featured Post

    What Should I Do With This Threat Intelligence?

    Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

    Join & Write a Comment

    This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
    Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
    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…

    734 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

    19 Experts available now in Live!

    Get 1:1 Help Now