Block ack with ISA2004?

Posted on 2005-04-25
Last Modified: 2010-04-11
Hey experts...

I need to ensure that the Last Default Rule on ISA2004 deny's external ACK I am protected from the possibility of ACK tunneling. If the last rule doesn't block this type of traffic, then I need to know how to create rule in ISA to block it.

Question by:neomage23
    LVL 2

    Accepted Solution

    The last default rule is deny all traffic from all networks to all networks for all users. If this rule was the only rule in place than absolutly nothing would pass in or out of the firewall. The possibility of ACK tunneling would be happening from a rule before the last default rule.
    LVL 6

    Author Comment

    Thanks Unified...that's what I thought, I just needed confirmation.

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