[Bug 263974] ipfw_nat64lsn reply destination mac address error

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263974

--- Comment #5 from Jim B. <jpb@jimby.name> ---
Ok, Comment #4 is solved by use of the "allow_private" keyword on the nat64lsn
create statement.  While the ipfw(8) man page mentions that IPv4 RFC 1918
addresses are not processed, it does not mention RFC 5737 addresses
(192.0.2.0/24, 198.51.100.0/24, and 203.0.113.0/24 - the one I was using. 
Adding the "allow_private" keyword fixed that for the use of the BSD Router
Project instance described in Comment #4.


However, going back and using my original 13.0-RELEASE-p11 VM instance, the
addition of the "allow_private" keyword does not fix the duplicated source MAC
address in the destination field in the reply.  

Now that 13.1 has dropped, I will spin up a VM and test with that.

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