Problem Receiving Internet E-Mails On ISA/Exchange Server
From: Imran Vilcassim (mvimran_at_hotmail.com)
Date: 08/06/04
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Date: Thu, 5 Aug 2004 22:05:44 -0700
Hi,
do this. remove the public ip in the isa server and
assign an ip which is in the same range as the private ip
of the NAT Device. confugure a NAT rule which forwards
mail traffic arriving on the external interface of the
NAT device to the external interface of the ISA server.
publish the exchange server in the ISA server.
Mohamed Imran Vilcassim (MCSE,MCT)
Technical Specialist - Microsoft MDP Sri lanka
email:mvimran@hotmail.com
>-----Original Message-----
>Sorry for the confusion. Yes, the external IP on the
ISA
>is a public IP. And the device performing NAT has both
a
>public IP and a private IP. The public IP on the NAT
>device is address translated to the private IP on the
ISA
>server.
>
>The DNS entry (I'm assuming you're referring to the MX
>record) points to the public IP address on the NAT
>device.
>
>Any ideas? Thanks again.
>
>>-----Original Message-----
>>hello,
>> your configuration is a little confusing? the
>>external ip u use on the ISA is a public IP is it? and
>>you say you have a device which performs NAT, what is
>>public and what is private here? where does you dns
>entry
>>point to?
>>
>>regards
>>
>>Mohamed Imran Vilcassim (MCSE,MCT)
>>Technical Specialist - Microsoft MDP Sri lanka
>>email:mvimran@hotmail.com
>>
>>>-----Original Message-----
>>>We are not able to receive Internet (outside) e-mails,
>>>but everything else works fine. We can send/receive
>>>internal e-mails and even send Internet e-mails. ISA
>>>Server and Exchange Server are installed on the same
>>>server, and the server has two nics.
>>>
>>>External nic IP address: 200.200.200.200 (w/def.
>>gateway)
>>>Internal nic IP address: 10.10.10.10 (no def. gateway)
>>>
>>>However, we also have a router which is performing
>NAT.
>>>So our router maps (NATs) our external "e-mail server"
>>>address of 250.250.250.250 (which is just the ip
>address
>>>of the serial interface on the router) to the internal
>e-
>>>mail (ISA) server IP address of 10.10.10.10.
>>>
>>>I've been trying to follow various documents on ISA,
>but
>>>have had no success. I don't know whether our
Exchange
>>>server is considered BEHIND the ISA server or ON the
>ISA
>>>server, because we are using the serial IP address on
>>the
>>>router for our external e-mail IP, instead of the
>>>external IP address on the ISA server (but Exchange is
>>>installed on the same server as ISA).
>>>
>>>Do I have to set up some form of access policy (like a
>>>packet filter) to receive Internet e-mails? If so,
>>could
>>>you please give me some guidance? Any help is
>>>appreciated. Thanks!
>>>
>>>
>>>.
>>>
>>.
>>
>.
>
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