RE: Split DNS Questions...

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
  • Date: Mon, 25 Apr 2005 08:32:17 -0700

Andrew, Split DNS is simple once you understand the concept. It is the
concept that most people such as yourself take a while to understand and
which necessitate screen shots and paragraphs of text to explain.

John T
eServices For You


> -----Original Message-----
> From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx]
> Sent: Monday, April 25, 2005 7:47 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: Split DNS Questions...
> 
> http://www.ISAserver.org
> 
> Split DNS is simple for the most part so I don't know why people make is
> so complicated by publishing screens and screens of text.
> 
> Basically you have your internal DNS which like you said works fine.
> 
> Then you have your external DNS which your ISP or domain name provider
> manages/ or allows you to manage.
> 
> All you really have to do is match your internal with your external.
> Example; exchange.server.com internally points to your exchange box,
> while on the internet it points to the external IP of your ISA server so
> that when you are at home or out on the road and were to ping
> exchange.server.com from another source it would respond with your
> companies external IP address (not the internal one).
> 
> Andrew
> 
> 
> -----Original Message-----
> From: Ball, Dan [mailto:DBall@xxxxxxxxxxx]
> Sent: Monday, April 25, 2005 10:12 AM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: Split DNS Questions...
> 
> http://www.ISAserver.org
> 
> I'm running into more and more problems with outgoing SMTP errors.  They
> seem to all tie back to using multiple ISPs on the ISA server.  The
> Internal DNS resolution seems to be working fine.
> 
> A lot of e-mail servers are now doing reverse DNS lookups before
> accepting a message, so I need to have that name resolved correctly.
> Hopefully a Split DNS will solve that for me.
> 
> Also, this morning I was notified of incoming mail being rejected also
> with an "unrouteable address" error.  While I think is most likely a
> problem with the sender's SMTP server, I can't be 100% certain.  If I
> can get an authoritative DNS server in here that we can control, it will
> allow us a lot more flexibility.
> 
> -----Original Message-----
> From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
> Sent: Monday, April 25, 2005 09:52
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: Split DNS Questions...
> 
> http://www.ISAserver.org
> 
> Hi Dan,
> 
> Split DNS isn't an ISA question.
> The core issue is how you configure DNS internally.
> 
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