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Thread: ACL for our DMZ

  1. #1

    ACL for our DMZ

    What should our ACL for our DMZ look like? Examples would be nice The only thing in our DMZ is a mail server and web server. We have a PIX 515. Thanks!

  2. #2
    THE Bastard Sys***** dinowuff's Avatar
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    Jun 2003
    Third planet from the Sun

  3. #3
    The ******* Shadow dalek's Avatar
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    Sep 2005
    I think this one was third or fourth:

    Without the "E"
    PC Registered user # 2,336,789,457...

    "When the water reaches the upper level, follow the rats."
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  4. #4
    Master-Jedi-Pimps0r & Moderator thehorse13's Avatar
    Join Date
    Dec 2002
    Washington D.C. area
    The question is too vague. Please be more specific.


    Here is my IP scheme for the DMZ: 10.10.10.X
    I only want to allow SSH to in the dmz. How do I do it?

    Answer: permit tcp any host eq 22

    Our scars have the power to remind us that our past was real. -- Hannibal Lecter.
    Talent is God given. Be humble. Fame is man-given. Be grateful. Conceit is self-given. Be careful. -- John Wooden

  5. #5
    Just configure the static NATing part and the ACL part well cant elaborate much than this,its scenario specific.dinowuff gave a good link.


  6. #6
    AO Ancient: Team Leader
    Join Date
    Oct 2002
    It's really pretty simple as a concept. The DMZ is a partially secured network in that it, by it's nature, must allow public access to it's resources. Other than that which must be allowed into the DMZ from the public network and that which must be allowed in from the private network everything else should be locked in either direction. Thus the following:-

    On the Public Interface

    Allow SMTP from Any to DMZ
    Allow HTTP from ANY to DMZ
    Deny Any from Any to DMZ
    Deny Any from Any to Private

    On the Private Interface

    Allow HTTP from Private to Public
    Allow HTTP from Private to DMZ
    Allow POP3 from Private to DMZ
    Allow SMTP from Private to DMZ
    Allow FTP from Private to DMZ, (to update Web Page)
    Allow [SMTP Management Port] to DMZ
    Allow [Whatever else you need] From Private to Public
    Deny Any from DMZ to Private
    Deny Any from Private to DMZ
    Deny Any from Private from Public

    You will note that nothing is allowed to the Private from the DMZ. IOW, any traffic _from_ the DMZ to the Private network is blocked. Only connections initiated from within the Private network on specific ports can be created. Same applies to the Public network.... Nothing can initiate a connection from the Public to the Private and only certain connections can be initiated from the Public to the DMZ to allow those services you provide publicly to function.

    In this way you ensure that compromising the Private network is as difficult as possible since you treat the DMZ in the same way you treat the Public network..... _un_-trusted!
    Don\'t SYN us.... We\'ll SYN you.....
    \"A nation that draws too broad a difference between its scholars and its warriors will have its thinking done by cowards, and its fighting done by fools.\" - Thucydides

  7. #7
    Thats it very nice description by TIGERSHARK . Good work and nice signature lol

  8. #8
    Thanks. And very nice Tiger Shark! Thanks again.
    empty space for sale... never been used... very roomy.

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