Multiple -d flags

[Mattia Martinello <mattia@xxxxxxxxxxxxxxxxxxxx>]

Hi

I wish to create a rule that allow a packet to a specified IP on a 
specified port.

The rule:

iptables -A FORWARD -s 0.0.0.0/0 -d 213.21.136.8/255.255.255.255 -dport 
80 -j ACCEPT

shows me the following error:

iptables v1.2.5: multiple -d flags not allowed
Try `iptables -h' or 'iptables --help' for more information.

How I can solve my problem?

Thank you very much
Bye
Mattia