RE: CIDR Explanation

From: Bénoni MARTIN (Benoni.MARTIN_at_libertis.ga)
Date: 09/21/04

  • Next message: David Gillett: "RE: CIDR Explanation" 
    Date: Tue, 21 Sep 2004 11:03:01 +0100
To: "ka55ad" <ka55ad@gmail.com>

    Hi !

    Do not worry, it has been nearly the same for me :)
            - If you want to use it without having to understand very well, you can play with http://www.solarwinds.net/Tools/Free_tools/Subnet_Calc/. It's free and quite good !
            - If you want to understand ... Well for my part, I passed the CCNA exam and in their book (not free :) ) they explain quite good this topic.

    HTH !

     

    -----Message d'origine-----
    De : ka55ad [mailto:ka55ad@gmail.com]
    Envoyé : lundi 20 septembre 2004 14:39
    À : security-basics@securityfocus.com
    Objet : CIDR Explanation

    Hi List,

         I am hoping that somebody might be able to help me out or point me in the right direction. For the life of me I can't seem to get a good grasp on CIDR notation. I see a lot of CIDR addresses every day, but I have trouble figuring out the IP addresses on the fly. I am not a complete newbie - I am quite familiar with the OSI model, TCP handshakes, etc but this one area stumps me.

         I am particularly interested in it because I am going to be setting up a snort box soon as well as an IP chains firewall to segregate parts of the network. I would much rather use CIDR since it can be much quicker at times, but I don't want to use it right now due to my lack of knowledge which can cause security issues. Can anybody offer advice/help? Thanks.

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    ---------------------------------------------------------------------------
    Computer Forensics Training at the InfoSec Institute. All of our class sizes
    are guaranteed to be 12 students or less to facilitate one-on-one
    interaction with one of our expert instructors. Gain the in-demand skills of
    a certified computer examiner, learn to recover trace data left behind by
    fraud, theft, and cybercrime perpetrators. Discover the source of computer
    crime and abuse so that it never happens again.

    http://www.infosecinstitute.com/courses/computer_forensics_training.html
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  • Next message: David Gillett: "RE: CIDR Explanation"