[cFire]

It's more a matter of what you consider to be obvious in this case. In my experience, especially regex matching can become very not-so-obvious if you're coming back to code you wrote some time ago. Or if someone else is reading it.

[richardwhiuk]

		# Do NAT table lookup
		n = natlookup( p1, p2 )

is clearly unnecessary. If natlookup doesn't do a NAT table lookup, it's a badly named function.