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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