From owner-freebsd-isp Mon Oct 18 13:45:58 1999 Delivered-To: freebsd-isp@freebsd.org Received: from pau-amma.whistle.com (pau-amma.whistle.com [207.76.205.64]) by hub.freebsd.org (Postfix) with ESMTP id AFE7315156 for ; Mon, 18 Oct 1999 13:45:55 -0700 (PDT) (envelope-from dhw@whistle.com) Received: (from dhw@localhost) by pau-amma.whistle.com (8.9.2/8.9.2) id NAA77485; Mon, 18 Oct 1999 13:45:54 -0700 (PDT) Date: Mon, 18 Oct 1999 13:45:54 -0700 (PDT) From: David Wolfskill Message-Id: <199910182045.NAA77485@pau-amma.whistle.com> To: freebsd-isp@FreeBSD.ORG, leifn@neland.dk Subject: Re: named telling the truth, but not the whole truth. In-Reply-To: Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >Date: Mon, 18 Oct 1999 22:29:54 +0200 (CEST) >From: Leif Neland >Is there a way to tell bind8 not to tell the world the same as it tells a >local server? I think so, but even when accomplishing your stated objective, I've not found it necessary. >Specifically, I have some hosts, which do dialin and pick up their mail by >ETRN. So their dns is: > some.dom MX 100 our.mastermail.server. > some.dom MX 10 their.dialin.server. >Is there a way not to announce the lowest MX-record to the world, but only >to our.mastermail.server? A couple of issues come to mind: * First, it's not necessry for the resolver on a given host (that is running a nameserver) to actually use the (local) nameserver. This is the observation that is central to the "split DNS" function found often in firewalls -- the externally visible machine runs a nameserver (for external consumption), but relies on an internal nameserver for hostname resolution for local processes. * In sendmail (dunno about other MTAs), it's possible to force suppression of the MX lookup by either placing the hostname part of the address is square brackets or by including the F=0 flag on the mailer (delivery agent). The latter is generally preferred. >I'd rather not have a separate named for our.mastermail.server; it would >be hell to administer. I'm sure you have (good) reasons for that assessment, but I confess that they aren't apparent to me at this time. Cheers, david -- David Wolfskill dhw@whistle.com UNIX System Administrator voice: (650) 577-7158 pager: (888) 347-0197 FAX: (650) 372-5915 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message