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==BitTorrent and the SuSEfirewall2==

The YaST firewall makes it nearly impossible to use the BitTorrent protocol.
Extremely slow download times could be the end result.

===The firewall is on the computer you dowload the file on===
There are two ways to configure the firewall:

1.) Start the YaST firewall and select the zone you want to allow services for (where
you want the enabled port). Click [Advanced] and enter the correct information 
(syntax from-port:to-port numeric). Click [OK], and YaST will ask you if you are sure.
Click [Continue] to return to the main dialog; click [Cancel] to re-enter
the port numbers. After returning to the main menu, click [Next] and [Accept] to
finish configuration.

2.) Open the /etc/sysconfig/SuSEfirewall2 file in any text-editor
Add the required ports to the FW_SERVICES_EXT_TCP, FW_SERVICES_INT_TCP or
FW_SERVICES_DMZ_TCP variable.
(# Examples: "ssh", "123 514", "3200:3299", "ftp 22 telnet 512:514")

See this page for more port information:
http://compnetworking.about.com/od/bittorrent/qt/bittorrentports.htm.

Adding TCP: "6881:6999" is a good idea, but could result in a security risk. Not
only P2P clients can use this port, as everyone should know.

===The firewall is on the server and you use BitTorrent on a client===
The example here is for a SUSE 9.0 server for it's what I have :-).

you must '''redirect''' the port 6881 (ktorrent) to your client. This is done going to /etc/sysconfig and editing the file SuSEfirewall2.

Edit the line FW_FORWARD_MASQ to have something like mine:
FW_FORWARD_MASQ="0/0,10.3.204.103,tcp,6881"

10.3.204.103 is the internal IP of my client, give yours.

After saving the modified file, restart the firewall, only typing "SuSEfirewall2" and Enter (no "restart" option).

Stop ktorrent and restart it. that's all.