PASV FTP Ports

[shyamatopsource]

I have a client that needs to connect to a FTP Server behind a Firewall. They need to use PASV FTP to access the Server.Can some one tell me what ports to open on the fw. For Active we have to open 20 and 21.. but not sure about PASV

Thx

Shyam

[hoogen_82]

Hi Shyan

Go through this document, it would give you a better understanding on this and also configuration.

Look for Protocol Problems: Extended Access Lists and FTP

http://www.quepublishing.com/articles/article.asp?p=376258&seqNum=10&rl=1

HTH

Hoogen

Do rate if this helps :)

[ahmednaas]

Here is how PASV Mode FTP works:

-The client issues the retrieval request.

-The client issues the PASV command to the server, indicating that it wants the server to go to the passive mode.

-The server sets up a listening port.

-The server responds, letting the client know which port it is listening to for the data connection.

-The client establishes the connection to the address indicated in the server's response to the PASV command.

Also, take a look at these documents:

http://www.cisco.com/en/US/products/ps6586/products_qanda_item09186a008009464d.shtml#qa5

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00807ee585.shtml