From owner-freebsd-net@FreeBSD.ORG  Tue Aug  7 16:32:43 2012
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From: Marko Zec <zec@fer.hr>
To: Eugene Grosbein <egrosbein@rdtc.ru>
Date: Tue, 7 Aug 2012 18:32:22 +0200
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Cc: freebsd-net@freebsd.org, Jacques Fourie <jacques.fourie@gmail.com>,
	"net@freebsd.org" <net@freebsd.org>
Subject: Re: Send traffic to itself using real NIC
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On Tuesday 07 August 2012 18:20:28 Eugene Grosbein wrote:
> On Tue, Aug 07, 2012 at 04:33:11PM +0200, Marko Zec wrote:
> > There's no need to use epair at all here.  Just create a vnet jail, and
> > assign one of the igb interfaces into it, done:
> >
> > # jail -c name=x vnet persist
> > # ifconfig igb1 vnet x
> > # jexec x ifconfig
> > lo0: flags=8008<LOOPBACK,MULTICAST> metric 0 mtu 16384
> >         options=3<RXCSUM,TXCSUM>
> > igb1: flags=8842<...> metric 0 mtu 1500 ...
>
> That would be nice solution but jail(8) manual page says:
> "a fairly complete file system install of FreeBSD is required"

No, a separate filesystem is not required, that's a manpage bug.  Just try the 
above 3 commands, they really work.

cheers,

Marko


> and that seems to be pretty big overhead. Meantime, I'll try to think up
> some kind of NETGRAPH mesh.
>
> Eugene Grosbein