> 
> I use that all the time, maybe 1 out of 100 times it will kill 
> a ssh session (only one that has irssi open cause of the time 
> updating it kills it, i have it set to update every second 
> though, so normally it'd be like 1 out of 500 or so) and even 
> if it does, it still finishes loading the ruleset anyway so 
> you can just ssh straight back in

I used 

sysctl -a net.inet.ip.fw.enable=0  && firewall.sh &&
net.inet.ip.fw.enable=1 && sleep 60 && reboot
and I would hit a ^c to stop the sleep and reboot if I didn't wack the
firewall rules.
  The reboot would put it back to rc.conf firewall

Never got disconnected.

Only window of vulnerability was while loading new firewall rules.

Yours is safer.
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