[Bug 219918] [patch] LibAlias: implement RFC 4787 REQ 1 and 3 (full cone NAT)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219918

Eugene Grosbein <eugen at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |eugen at freebsd.org

--- Comment #1 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Damjan Jovanovic from comment #0)

Your patch makes significant change unconditionnaly and the change may present
regression for other use cases:

- it can degrade performance of libalias hash function that is not perfect
already;
- it decreases port variance of translated traffic that can degrade performance
of L3 channel load distribution.

Note that libalias already has a flag PKT_ALIAS_SAME_PORTS (natd -same_ports or
ipfw nat config same_ports) to somehow change port translation rules. Please
make your change conditional using new flag for new translation mode.

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