Forward rule can't specify destination address?

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Hi all-

I have a linux box with 1 network card connected the internet with 7
internet IP's, and 1 network card and internal ip.  I'm trying to forward
a port from one of the internet ip's aliased to it across the firewall to
internal.  Here's the forward rule that I use:

$IPTB -A FORWARD -d 1.2.3.4 -p tcp --dport 3389 -j ACCEPT


When I connect to the specified IP address it doesn't work.  If I take the
destination IP out it works fine.  Any ideas as to why it won't work with
the destination IP?


Thanks!