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Publish MSX2003 ISA2007 Outgoing Network External IP

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Publish MSX2003 ISA2007 Outgoing Network External IP - 28.Nov.2008 10:23:26 PM   
simonchtan

 

Posts: 12
Joined: 29.May2008
Status: offline
Hi,

I am sorry if i am posting an discussed item but i do need help with my current implementation.

here my problem



I need the ISA to able to do a connection out with my MSX published address instead of it primary external address.

I am stuck due to the fact i cant change the external address as it tie in to some secure application which i am not able to change

Incoming is doing great however the outgoing is giving me the run for my pay.

I would love any advise you have.
Thanks.

< Message edited by simonchtan -- 28.Nov.2008 10:24:34 PM >
Post #: 1
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 29.Nov.2008 7:25:01 AM   
IanC

 

Posts: 338
Joined: 11.Jul.2007
From: UK
Status: offline
Hi,

In this scenario, ISA Server will always use the primary IP address of the external NIC as the source.  It is likely that the outbound SMTP connection is failing validation performed by external DNS servers because of the mismatch between the MX record and the source IP address (ISA's primary IP). 

You should be able to fix this, either by adding a pointer record for the external primary IP address to the external DNS zone or by asking the authority of the destination SMTP servers to add your domain to their safe senders list.

Hope this helps

Ian   

_____________________________

Ian Currie

nAppliance TMG/UAG Appliances - EMEA
www.surefront.co.uk

(in reply to simonchtan)
Post #: 2
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 29.Nov.2008 11:39:05 PM   
simonchtan

 

Posts: 12
Joined: 29.May2008
Status: offline
Thank you Ian,

I believe i may have to go for the ptr method.
Could you explain to me more on this as i am not very well verse in DNS. I am having a MX record of the orignal address so how do i create this ptr.

is it means i create a new PTR of the IP address to be tie to the mail server name

(in reply to IanC)
Post #: 3
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 1.Dec.2008 10:30:33 AM   
IanC

 

Posts: 338
Joined: 11.Jul.2007
From: UK
Status: offline
There will be a reverse-lookup DNS zone on the Internet representing the public network to which your public facing IP address(s) belongs.  Add (or get your ISP to add) a pointer record to this zone.  The record should look like this:

[123.123.123.1]     [FQDN of your existing MX record]

Ian 

_____________________________

Ian Currie

nAppliance TMG/UAG Appliances - EMEA
www.surefront.co.uk

(in reply to simonchtan)
Post #: 4
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 2.Dec.2008 7:24:43 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

there´s a third party solution for select the outbound IP address, check this product for more info: http://www.collectivesoftware.com/Products/IPbinder

Regards,
Paulo Oliveira.

(in reply to simonchtan)
Post #: 5
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 2.Dec.2008 7:43:19 AM   
IanC

 

Posts: 338
Joined: 11.Jul.2007
From: UK
Status: offline
Hi Paulo,

I didn't know that.  Thanks for the tip.

Ian

_____________________________

Ian Currie

nAppliance TMG/UAG Appliances - EMEA
www.surefront.co.uk

(in reply to paulo.oliveira)
Post #: 6
RE: Publish MSX2003 ISA2007 Outgoing Network External IP - 4.Dec.2008 7:37:48 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi Ian,

no probs. Glad to help.

Regards,
Paulo Oliveira.

(in reply to IanC)
Post #: 7

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