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I have a PIX 515 with three interfaces. Outside, Inside, and DMZ. I have had no problems accessing or browsing the internet from inside to the outside. I have recently setup a DMZ to host a mail server, and communication is working fine inside and ou...
Creating access-lists that deny ICMP or IP based port specific packets is the only way, and then review the log. Otherwise, your talking about an external IDS device on the outside segment of you router.
