Hello list.
I know this is a very simple issue, but I can't find a quick answer and I don't have much time to google around; I need the thing working in short time.
OpenBSD + PF firewall, connecting 3 "internal" networks to an "external" one.

The firewall has 5 NICs, re0 to re4; re0 is connected to the external network, re1 to re3 to internal networks; re4 is currently unused.

I have a single "external" IP mapped on re0 and 3 "nat" pf rules, one for each "internal" network, plus some basic filtering. Very simple, works ok.
Now I need to get a second "public" address and create a 1:1 map to an "internal" host.

I understand I have to use a "binat" rule, which looks very simple, but I still miss the whole procedure.
I suppose somehow I have to map the second public address to re0, then apply the binat rule; otherwise I can use re4.
Can someone point me to some proper documentation, some howtos,...?

Otherwise, can someone give me a list of the logical steps to achieve this trivial goal?
Thank you all!
Byee,

Manuel
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Hana wa sakuragi, hito wa bushi