From owner-freebsd-virtualization@FreeBSD.ORG  Tue Aug 25 13:16:27 2009
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Date: Tue, 25 Aug 2009 16:16:06 +0300
From: Nikos Vassiliadis <nvass9573@gmx.com>
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Subject: interface name collisions
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Hello,

  It seems that there is no checking for name collisions,
when an interface is claimed from a child vnet.

create ngeth0
> lab# ngctl mkpeer eiface ether ether
create test jail
> lab# jail -c persist vnet name=test
create ngeth0@test
> lab# jexec test ngctl mkpeer eiface ether ether
claim ngeth0@test
> lab# ifconfig ngeth0 -vnet test
> lab# ifconfig ngeth0
> ngeth0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         ether 00:00:00:00:00:00
>         ether 00:00:00:00:00:00
> lab#

Thanks in advance, Nikos