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Network Security Firewalls
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Re: Possible attack or what ?

Subject: Re: Possible attack or what ?
Date: Wed, 8 Dec 2004 20:24:22 -0500 (EST)

On Tue, 7 Dec 2004, STANESCU Ionut wrote:

"
list 101 denied tcp 10.1.141.53(4814) -> <my external ip>(1111)
list 101 denied tcp 10.1.178.197(3926) -> <my external ip>(1111)
list 101 denied udp 10.1.201.48(3306) -> <my external ip>(1111)

"

Two things happening here, one is confusion. The machines (10.1.141.53,
10.1.178.197, 10.1.201.48) are all trying to connect to the firewall's
external address not any  outside source unless you didn't post the
outside sources. Your eMule clients are trying to get out to the net. Did
you list the external_ip as your gateway? If so that answers your
question. If not then run a sniffer on your network to determine what
traffic is being passed to and from those addresses to and from the
firewall to the addresses, that would show you what exactly is happening
INTERNALLY.

If you suspect something fishy on the machines themselves, then I suggest
using Process Explorer, and TCPView on the Windows machines to get an idea
of what is doing what.

http://www.sysinternals.com/ntw2k/freeware/procexp.shtml
http://www.sysinternals.com/ntw2k/source/tcpview.shtml


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