Firewall: NAT: Port Forward - Redirect only port and not ip
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 I want to move tcp/udp port 12 to port 13 on wan. But i don't know the dynamic ip. 
 Is it possible "Redirect target IP" to be left empty?
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 Put a dns name there?! 
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 How will you redirect incoming traffic if you don't know where you want to redirect it to? 
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 Perhaps ggzengel wants to change just the destination IP port number and leave the destination IP address unchanged. 
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 I will forward wan:23 to wan:22. But wan has a dynamic ip. 
 I don't want to forward wan:23 to lan:23 because it's the first step thru the firewall.
 It would be nice to have a drop down box like sorce ip in rules.
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