poliy routing: passive ftp

hello

( first sorry for my bad english )

i have two internet connection.

dsl1 = ppp0 = http, mail,.. for the user. the defautl route is on dsl1

dsl2 = ppp1 = for the ftp-upload and download


with "policy routing" that the ftp ( port 21 + 20 )
connect over dsl2, work! ( aktive )

but the passiv ftp did´t work.

####
the rules:

iptables -A PREROUTING -i eth0 -t mangle -p tcp --sport 21 -j MARK
--set-mark 1

iptables -A PREROUTING -i eth0 -t mangle -p tcp --sport 20 -j MARK
--set-mark 1

iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 21 -j MARK
--set-mark 1


iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 20 -j MARK
--set-mark 1

ip rule add fwmark 1 table ftpe

ip route add default dev ppp1 table ftpe

###


how can i "mark" the passiv ftp connection...?
( high-port <-> high-port )

thanks!