[LARTC] Port forwarding/translation control

[LARTC] Port forwarding/translation control

[Patrick Turley]

My Linux system is acting as a NAT'ing firewall, and I have some rules 
for doing port forwarding/translation.

I was thinking about this the other day and I realized that there are 
other parts of the system that consume ports. Specifically, NAT and 
ephemeral port allocation.

It occurs to me that I could potentially have a conflict. If I set up a 
rule to forward/translate a port, and the NAT'ing code picks the same 
port for what it's doing, then there would be a big problem.

Eventually, I'll need to dynamically allocate ports of my own for 
transitory port forwarding/translation. I need a way to set aside some 
ports that I can use sure the NAT'ing code and the ephemeral port 
allocation code won't try to use.

If anyone has anything illuminating to say on this point, I'd be very 
grateful.

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