Iptables problem

Reindl Harald h.reindl at thelounge.net
Sat Mar 9 13:36:30 UTC 2013

Am 09.03.2013 14:23, schrieb davidschaak1 at mobilicity.blackberry.com:
> Using 
> iptables -A INPUT -p tcp -dport 20 -j ACCEPT

this is a useless problem description at all
since our glass balls are broken

20 is active FTP and will not work until the client's
firewall opens the random port of the ftp-client while
for passive ftp on port 21 the server tells the client
his random port and is responsible via conntrack to allow
the data connection

in other words: these days nobody is using active FTP

here some basics stuff:

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