> This is not really NAT in the traditional sense.  For instance,
> there is no need to retain any connection-oriented history here.
> I have tried various flavors of the rule:
> 
> rdr hme0 1.2.3.4/32 port 540 -> 1.2.3.4 port 999 tcp

Try this instead:

map hme0 from any to 1.2.3.4/32 port = 540 -> 0/0 port 999 tcp

Darren

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