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To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
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Date: Tue, 08 Jul 2008 18:44:30 +0200
From: Daniel Gerzo <danger@FreeBSD.org>
Organization: The FreeBSD Project
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Cc: Mel <fbsd.questions@rachie.is-a-geek.net>,
	David Allen <the.real.david.allen@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: Jails and IP Aliasing
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Hello,

>    * Something like a loopback address inside the jail.  It may be
>      127.0.0.2 instead of 127.0.0.1 but most software can be persuaded
>      to use it for loopback style things.
> 
>    * The ability to map several IPs onto the jailed system by use of
>      NAT and redirect within firewall rules
> 
>    * The ability to have a jail with /no/ external IP for when the
>      paranoia becomes unbearable[*].

Most of this is actually implemented by bz@. You can find some patches
at http://sources.zabbadoz.net/freebsd/jail.html 

-- 
Best regards,
  Daniel Gerzo