psd and active ftp mode

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hello,

 i was just testing psd match and w/ ftp active mode.

 I created 10000 files on the ftp server and set my ftp client to
 active mode and let it download those files while having
 `iptables -A INPUT -p tcp -m psd -j REJECT --reject-with tcp-reset`
 (with psd default threshold/weigh values).
 The psd matched 3136 packets.

 Ftp server went mad issuing:
  425: Unable to build data connection: Connection refused

 This means i cannot relay on psd and block 'possible portscans'?
 Any suggestions?

 The same would happen, if i created some rules with limit match..

 
P.Krumins



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