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ARP cache

Discussion in 'Networks' started by greenbrucelee, Feb 23, 2008.

  1. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Is having the option to protect the ARP cache in a firewall attack detection settings useful on a home computer or is this only useful on a proper network?
     
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  2. zebulebu

    zebulebu Terabyte Poster

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    GBL - are you talking about protecting yourself from ARP spoofing? ARP spoofing is a technique to trick machines on a LAN into routing all their traffic via a spoofed default gateway address. Your machine shouldn't be contactable from the Internet, and, unless you have an EXTREMELY badly configured router/firewall, ARP spoofing shouldn't be an issue on your firewall - from the outside at least.

    If you want to understand ARP spoofing, the easiest way to do it is to try it out on your LAN for yourself. Set up a second machine on your local network, install Cain & Abel and set it to poison the ARP cache - then watch in amazement as all traffic from the other machine that is destined for a network outside the local LAN gets routed through the 'fake' DG first - allowing you to capture every single packet. Very, very dangerous if implemented ona network where the security controls are lax (most networks I've worked on fall into this category)
     
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  3. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Its just an option thats on my firewall (comodo) which isn't on by default but the firewall is well configured. I was just wondering if its best to have it on for that extra piece of protection.
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  4. zebulebu

    zebulebu Terabyte Poster

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    Up to you. Not sure how it would protect you from ARP spoofing tbh - more than likely just placing a static entry in your ARP cache that points to the correct MAC. You could do this yourself, but I guess you may as well turn it on anyway - it certainly shouldn't do any harm and, if a machine on your local network becomes compromised I guess it's just another layer of protection. Of course, if a machine on your LAN does get rinsed, ARP spoofing will be the least of your problems!
     
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  5. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Cheers for you help Zeb I'll switch it on and see what/if anything happens.

    Rep give for yolur help :D
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?

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