Transmission traffic through VPN client

I'm looking for technical assistance to routing all transmission traffic through my VPN-client. Currently I have VPN set up as follows:

Custom Configuration:
persist-key
persist-tun
tls-client
comp-lzo
verb 1
route-noexec
script-security 2
route-up /jffs/my_tun11_up_script.sh
down /jffs/my_tun11_down_script.sh

my_tun11_up_script.sh:
#!/bin/sh

# call the teardown script just in case
sh ./my_tun11_down.script.sh



#...

Transmission traffic through VPN client