Am Do, den 29.04.2004 schrieb duncan brown um 13:30:
Jeff Vian said:
> established while new connections can be blocked. I use this on both
> ftp (allowing only port 20) and http (allowing only port 80).
just to ensure that no green sticks here (new people) get confused, ftp is
21, not 20.
That is not correct, or you are only speaking about passive FTP mode.
Then port 20 and random high ports are participated. In case of active
FTP mode port 20 is used too! See for illustration i.e.
http://slacksite.com/other/ftp.html
you can check what port and protocol is for what service in
/etc/services
$ grep ftp /etc/services
ftp-data 20/tcp
ftp-data 20/udp
ftp 21/tcp
ftp 21/udp fsp fspd
-d
Alexander
--
Alexander Dalloz | Enger, Germany | GPG key 1024D/ED695653 1999-07-13
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