Active mode:
The client tell to the server to connect on port XXX (the port is determine by the client via the PORT command)
See http://www.cisco.com/warp/public/759/ip ... re_ob1.gif
for a graph.
Here, the server connect to the client. So, if the user is back of a firewall, the server can't connect to the client.
Passive Mode:
The server tell to the client to connect on the PORT XXXX (the port is determne by the server via the PASV command)
See http://www.cisco.com/warp/public/759/ip ... re_ob2.gif
for a graph.
Here, the client connect to the server. So, if the server is back of a firewall, the client can't connect to the server.
For more information, go check this document:
http://www.cisco.com/warp/public/759/ip ... _oneb.html
Difference between Active and Passive mode
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Difference between Active and Passive mode
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