With FreeBSD 9.1-RC2 you can assign the same link local address manually to two
different hosts on the same network. The Neighbor Solicitations are not
responded to and you end up with non-working addresses. The simple way to
reproduce this is to boot two systems on the same network and get the link local
for system 1. Shut it off and manually assign that address to system 2. Then
boot system 1. System 1 will send the Neighbor Solicitation but system 2 will
not respond to show that address is in use so system 1 uses the duplicate
address.
Even more interesting, I have another system, 9.1-RC2, that when it comes up
never sends the Neighbor Solication. It just starts using the link local
address. I can't find any significant differences between those two systems
other that the first was a direct install from the CD and the second was a
freebsd-update from 9.1-RC1.
Should I send a PR or is this a known issue?
