Connection probs from inside a router

[en3rmax]

Hi there, i just setup ioftpd latest version on my mates machine he has a draytek cable router i've forwarded the ports 5420 & 5421-5450 i've added the bind= to his internal ip but when i try to connect to the ftp from inside his router it won't connect but if i connect from another location outside his router it will connect fine.

i've only forwarded the ports in his router, do u have to use the port redirection too??

thanks in advance guys