?????NOT 100% SHORE WHY

CAN SOMEBODY MAYBE HELP EXPLAN THE FOLLOWING TO ME

IM NOT SHORE ANY MORE

when do i use forward change

input

out

prerouting
postrouting


as i cant seem to get my ques to work right

this is what i tryed on some of the connections
as each ip is the ip address of my pppoe clients connections?
/ip firewall mangle
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
BRENDAN-P2P passthrough=yes src-address=10.0.0.248
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0001-BITTORRRENT passthrough=yes src-address=10.0.0.1
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0002-BITTORRRENT passthrough=yes src-address=10.0.0.2
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0003-BITTORRRENT passthrough=yes src-address=10.0.0.3
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0004-BITTORRRENT passthrough=yes src-address=10.0.0.4
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0005-BITTORRRENT passthrough=yes src-address=10.0.0.5
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0006-BITTORRRENT passthrough=yes src-address=10.0.0.6
add action=mark-packet chain=forward comment=“” disabled=no new-packet-mark=
ZW0007BITTORRRENT passthrough=yes src-address=10.0.0.7

I am not sure what your question is all about but I guess the following link
could be a good start for you:

http://wiki.mikrotik.com/wiki/Packet_Flow