log ftp servers in our network

[Banai Zoltan <bazooka () emitel hu>]

Hi!

[Please CC me]

Short:
Is it possible to log that there is ftp server in our network on _any_ port?

Detailed:
I have a router. There is not allowed to run ftp/www server in our net.
Is ther a method to analyze all connections going throu the router 
(couse of there might be servers on different port than usal)
and determine if it is an ftp/www session and if it is then log the ip
of the server that is running ftp/www.
I think there is a need to reassembly the connection and match things in the whole
connection?
Is it possible? How can i do that? Where to read about doing that?

Best, Banai

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