Passive FTP Examples in Pratical Studies Vol. 2.

From: William Chen (kwchen@netvigator.com)
Date: Thu Feb 26 2004 - 21:14:01 GMT-3

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Dear all,

   In all the examples of passive FTP in the book of Ptractical Studies Vol.
2. It states that to match the passive FTP traffic by ACL to a server, the
ACL should be:

   1. permit ip tcp any host x.x.x.x ftp
   2. permit ip tcp any host x.x.x.x gt 1023 established

    I wonder why established is used in the statement 2, since in passive
FTP, the data channel should be initiated by the client to server at a port
greater than 1023.

Best Regards,
William Chen

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