Receving packets from external source on PIX

Hi.I have a rather strange problem. We have a PIX515E in our society and for the last two days we received packets with an invalid domain on our server DNS addresses outside of our network. What is really strange is that from the outside, the traffic can enter only our DMZ (not inside network) through specific ports (generally port 80 tcp) for specific services and the problem that is happening inside.

Is it possible to monitor these packets when they arrive on a PIX or better yet block them (they got 4 different IP addresses of 4 different ranges)? Maybe it's possible that a PC inside is providing access to these packages?

Any help is welcome.

See the document below for more details

ASA 7.x/6.x PIX and superior: open / blocking the example of Configuration of Ports

http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080862017.shtml

Tags: Cisco Security

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