port forwarding question

[Phil Sutter <phil@ctekproducts.com>]

Hi,

We have been using commands like the following to forward a single port
on our Linux systems and it works fine:

iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 5080 -j DNAT --to
192.168.1.10:80

I am now trying to find a method for port forwarding a range of ports.
For instance, forwarding port 5080 - 5084 to ports 80 - 84 so that:
- port 5080 traffic ends up on port 80
- port 5081 traffic ends up on port 81
- port 5082 traffic ends up on port 82
- port 5083 traffic ends up on port 83
- port 5084 traffic ends up on port 84

I thought I could do the following but it does not work:

iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 5080:5085 -j DNAT
--to 192.168.1.10:80-85

Is there a way to do what I want to do with a single command or do I
have to forward each port with an individual command?

Thanks,

Phil Sutter