Hilfe! Router läßt kein LIST auf FTP zu

[_m3]

@aprex:
passiver modus (siehe oben, dann brauchst du keinen kanal 20)?

The FTP control connection is established via TCP between the user
process port U and the server process port L. This protocol is
assigned the service port 21 (25 octal), that is L=21.
...
The FTP specification says that by default, all data transfers should
be over a single connection. An active open is done by the server,
from its port 20 to the same port on the client machine as was used
for the control connection. The client does a passive open.

Siehe auch:
RFC 1579 Firewall-Friendly FTP: ftp://ftp.isi.edu/in-notes/rfc1579.txt
RFC 959 FILE TRANSFER PROTOCOL (FTP): http://www.rfc-editor.org/cgi-bin/rf...ile_format=txt
Und eine SEHR gute Erklärung: http://www.slacksite.com/other/ftp.html