emule problems

to let emule working fine i had to set some virtual servers for the ip of
the lan card and the wlan card... i dont know why but if i set two virtual
servers on the same port for 2 ip.. i was only able to use emule with the
lan card (the one whose ip i set for first) and then i found out that if i
change the settings in the prog (while using the wireless card), that is
from 4662 to 4663 and i create a virtual server for the wlan ip on that port
it works fine...

the fact is that every time i switch from lan to wlan and viceversa i lose
the connection with emule... while bittorent keep on workin fine. is there
any mean to switch between one connection to the other without having to
change the port (though losing the connection)...
is it real impossible to set up 2 virtual servers on the same port but with
different ips or have i made sth wrong?


thx in advance

blly