This allows a UDP port to be setup even if the interface doesn't exist yet.
I've done similar things on Linux
in sysctl.conf adding
net.ipv4.ip_nonlocal_bind=1
will let you start a daemon listening to an IP address that doesn't exist on the
box.
This is great for failover systems so you can configure something to listen on a
VIP even before the VIP exists on the machine.
It does have a gotcha in that if you do configure something to listen on the
VIP, if you then try to send traffic to that VIP, it will go to the local copy,
not to the remote system that currently owns the VIP.
Something along the lines of the info above should probably be added to the
documentation for the freebsd feature
David Lang
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