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Date: Fri, 11 Jul 2008 08:12:28 -0700
From: Jeremy Chadwick <koitsu@FreeBSD.org>
To: Brett Glass <brett@lariat.net>
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Cc: Doug Barton <dougb@freebsd.org>, stef@memberwebs.com,
	"freebsd-security@freebsd.org" <freebsd-security@freebsd.org>,
	secteam@freebsd.org, Remko Lodder <remko@freebsd.org>,
	Andrew Storms <astorms@ncircle.com>
Subject: Re: [Fwd: cvs commit: ports/dns/bind9 Makefile distinfo
	ports/dns/bind94 Makefile distinfo ports/dns/bind95 Makefile
	distinfo]
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On Fri, Jul 11, 2008 at 08:54:48AM -0600, Brett Glass wrote:
> Is there a way to restrict the ports which BIND selects -- perhaps
> at the expense of a small amount of entropy -- such that it doesn't
> try to use UDP ports which are administratively blocked (e.g. ports
> used by worms, or insecure Microsoft network utilities)? We don't 
> dare turn these port blocks off, or naive users will fall prey to 
> security holes in Microsoft products. But if BIND doesn't know to
> work around them, lookups will occasionally (and infuriatingly!)
> fail.

query-source has an argument called "port" which will do what you want.
That option *only* affects UDP queries, however; TCP queries are always
random.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |