Network troubleshooting, any experts?

[Alexander Dalloz]

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
Fedora GNU/Linux Core 1 (Yarrow) on Athlon CPU kernel 2.4.22-1.2188.nptl
Sirendipity 14:04:42 up 2 days, 12:53, load average: 0.77, 0.96, 1.24 
                   [ Γνωθι σ'αυτον - gnothi seauton ]
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