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Access Lists - Ins and Outs

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  • Access Lists - Ins and Outs

    I am studying up on my Cisco and started to have trouble with Access Lists. I am having a hard time understanding the concept of "inbound" and "outbound" interfaces. I have looked at some other various websites, but still cannot grasp this concept. I'm looking for a concise way to determine the inbound and outbound interface in reference to Access Lists. Can anyone shed some light?

    Thanks.
    MCITP:SA, MCSA 2003, MCP, CCNA, A+, Net+, Security+

  • #2
    Re: Access Lists - Ins and Outs

    Think of it this way:

    inbound traffic on an interface is traffic coming from a host or network.
    outbound traffic on an interface is traffic going to a host or network.

    when you ping www.google.com from your computer, the router sees the traffic as inbound on the LAN interface (from your computer) and outbound on the WAN interface (to google).
    Last edited by joeqwerty; 31st August 2007, 00:30.

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    • #3
      Re: Access Lists - Ins and Outs

      Thanks. That makes more sense now.
      MCITP:SA, MCSA 2003, MCP, CCNA, A+, Net+, Security+

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      • #4
        Re: Access Lists - Ins and Outs

        Here are a couple of helpful links on Access-Lists-

        1) Free VIDEO I made on how to create and apply ACLs, titled "Hardening your Cisco Router with ACLs".

        2) Article about a FREE ACL Editor & Simulator I discovered.

        If you are interested in ACL's and want to learn more Please check both of these out!

        And, as always, post your ACL questions here. Myself and all the other Cisco network admins on the forum would be glad to help out!
        David Davis - Petri Forums Moderator & Video Training Author
        Train Signal - The Global Leader in IT Video Training
        TrainSignalTraining.com - Free IT Training Products
        Personal Websites: HappyRouter.com & VMwareVideos.com

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