Trouble setting ports for forwarding

Question

I am on ubuntu and trying to add the following rule
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp — dport 80 -j REDIRECT — to-port 3000
At first I get the error Bad argument - So I guess it's -to-port missing a trailing hyphen and change it to this:
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp — dport 80 -j REDIRECT —-to-port 3000 I then get the same error. I guess this is related to the dport so I change the command to this:
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp —-dport 80 -j REDIRECT —-to-port 3000
And now I get the error Bad argument —-dport. Not sure where to go from here. Any ideas on what I might be doing wrong and how I can fix this?

John · Answer

If that's the exact line you are using, you are using two different dashes.  The first is hex 97, Em Dash, and the second is hex 2d, dash, the minus sign.  Re-do the line like this, using, dash, the minus sign.
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3000

Trouble setting ports for forwarding

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