port stealth mode?

[Chris Buechler]

Leslie Jensen wrote:
> Hello
>
> I've done some testing with Steve Gibsons "Shields up"
>
> https://www.grc.com/x/ne.dll?bh0bkyd2
>
> These tests lists the ports as closed but visible.
>
> Instead the site suggest that one uses stealth so that the ports are 
> not visible from the Internet.
>
> Is there a way to achieve this with PF?

That's what pf does by default if you don't specify "return", 
"return-rst" or "return-icmp" in your block rules.