This bug was fixed in the package lxc - 0.7.5-3ubuntu34
---
lxc (0.7.5-3ubuntu34) precise; urgency=low
[Benji York]
* lxc-start-ephemeral: create unique MAC for each new
ephemeral container (LP: #949956)
-- Scott MoserThu, 08 Mar 2012 16:23:49 -0500
** Branch linked: lp:
I've submitted an MP
(https://code.launchpad.net/~benji/ubuntu/precise/lxc/bug-949956/+merge/96601)
to fix this.
The hostname and /etc/hosts munging is already done in lxc-start-
ephemeral (and arguably in a superior way), so I left that part alone.
** Branch linked: lp:~benji/ubuntu/precise/lxc/