RE: DNS and Routers

Hi Mark,

That's better. I only have about 8 MB of RAM in my Hippocampus, so I
need to keep the number of variables I have to manipulate to a minimum
:-)

Your ISA Server is connected to the Internet via a DSL connection of
some kind and the DSL connection is your external interface. Everything
else is internal as far as the ISA Server is concerned.

If you need to send mail to an external SMTP server, then you need to
create an SMTP Protocol Rule and maybe a Site and Content Rule to allow
the SMTP server access to the Site, depending on how you have things set
up.

If you need to receive mail, then you need to publish the Exchange SMTP
service.

If the ISP's SMTP server and your SMTP server are using TRN or ETRN,
then you need both :-)

If you need MX mail domain name resolution, then you will need a DNS
query and maybe a DNS Zone Transfer Protocol Rule.

HTH,
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:mark@xxxxxxxxxxxx] 
Sent: Saturday, February 08, 2003 5:31 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: DNS and Routers


http://www.ISAserver.org


Well I thought I explained that clear enough.. Hm.. I should work on
this :)

Alright, the ISA is connected to the same network as the UUNET router
and
the DC (=exchange). The DSL router connects to the external interface
(LAN
adapter) of ISA. So we have 2 entry points into the network, one being
the
DSL router connected to ISA, the other one being the UUNET router which
connects directly to the internal switch. Another thing to take care of
:)

I am not aware that I said something about a client having a problem. As
to
ETRN I'm not too shure about the setup, you know, I wanted to check with
you
guys what possiblities there are - a little homework for the weekend. I
*think* that the mail delivery is initiated by UUNET as soon as they
find
out that the customer goes online.

Well the whole thing has only little to do with DNS, it only gets
important
when the exchange server is to send mail to the smart host. The question
is
how do I send and receive mails (and do everything that's involved with
this) over a "secondary" internet connection.

I hope I made myself clear :)

Thanks
Mark

> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
> Sent: Friday, February 07, 2003 11:02 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: DNS and Routers
>
>
> http://www.ISAserver.org
>
>
> 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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