RE: DNS and Routers
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 7 Feb 2003 16:01:32 -0600
Hi Mark,
Where is the ISA Server?
Where is the client that's having the problem?
Where is the Exchange Server?
What type of external interface are you using on the ISA Server?
Are you using ETRN? If so, why?
Thanks!
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Mark Hippenstiel [mailto:m.hippenstiel@xxxxxxxxxxxx]
Sent: Friday, February 07, 2003 10:25 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] DNS and Routers
http://www.ISAserver.org
Hello list,
We have a customer that uses UUNET via an ISP-supplied router to have
mails
delivered to his Exchange server (dial-up). The UUNET mail server is
functioning as a smart host for Exchange. This router is directly
connected
to the internal network. The Exchange machine has its def. gw set to
this
router.
There is an ISA box in the network that was added long after the UUNET
router. The clients default-gateway to ISA and also are setup as web
proxy
clients. ISA runs a DNS server, as does the Exchange machine
(synchronizing
internal zones). The external interface is connected to a second router
that
manages a DSL dod connection.
The DNS problem with the clients registering themselves with ISA instead
of
the DC left aside (we will take care of that seperately), my first
thought
was to connect both routers to the external interface of the ISA box and
let
the default gateway point to the DSL router.
We could then ping the UUNET router to initiate mail transfer to the
Exchange. This would work just fine. As to outgoing mails, as far as I
know
the UUNET smart host will only function when it receives mails from
within
the UNET network (this would be fairly common). Alternatively, we could
also
configure exchange to deliver mails directly over DSL to the recipient's
MXes but since we have a variable IP there, some mails will be rejected.
Is there any way to tell Exchange or ISA how to handle this? I was
thinking
of a manual route that routes all traffic on the UUNET subnets to the
UUNET
router, but this would be prone to errors, for instance when addresses
or
ranges change.
Thanks for listening and thanks for helping
Mark
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