svn commit: r314471 - head/sys/net

[Hiroki Sato]

Warner Losh <imp at FreeBSD.org> wrote
  in <201703010447.v214lM4c026957 at repo.freebsd.org>:

im> Author: imp
im> Date: Wed Mar  1 04:47:22 2017
im> New Revision: 314471
im> URL: https://svnweb.freebsd.org/changeset/base/314471
im>
im> Log:
im>   Fix VNET - DAD detected duplicate IPv6 address
im>
im>   Assign a hopefully unique, locally administered etheraddr. - for
im>   epairNa & epairNb
im>
im>   Submitted by:	Catalin <sslevil at users.noreply.github.com>
im>   Pull Request:	https://github.com/freebsd/freebsd/pull/92

 This was discussed in D1858.  epairNa and epairNb never have the same
 L2 addr because eaddr[5] is unique.  If the goal of this change is to
 prevent a conflict of L2 addrs with epairNs created in another vnet
 jail on the same system or on the same network, eaddr[5] of epairNa
 (around l.839) must also be randomized at least.

 While I am still for a deterministic value because changing the L2
 addr every time when rebooting a vnet jail is annoying, but if we use
 some random numbers for the vendor bits, I think eaddr[2] should be
 initialized in the same way.

-- Hiroki
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