Small change for debian 6.0 (and shorewall)

Great plugin, works like a charm.

One gotcha on a Debian 6 system: I found I had to add a port definition to the example given in the readme otherwise it puked on startup. This may have been because I used the shorewall action rather than the default all ports IP table rule, but might be worth noting anyhow.

Cheers,

M

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