Update delay when using nat table?

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Hello, im trying to redirect a port based in source ip like this:
iptables -t nat -A PREROUTING -p udp --dport 777 -j REDIRECT --to-port 888 -s x.x.x.x

Notice that i will have services listening on both ports. Allthough this works it takes several minutes for it to take effect. And it doesn't seem to take effect at all if i keep sending packages to port 777 here in the example. How can i make it take effect instantly? Or is thier any other way of doing this (redirecting a port locally) on a debian squeeze machine?

Thanks,
Sheepa --
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