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A little DNS help needed

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A little DNS help needed - 13.Nov.2001 6:13:00 PM   
rldavis622

 

Posts: 6
Joined: 1.Nov.2001
From: Maine
Status: offline
Hey all,

I am pretty positive from what I have been reading on this site and on technet, that the problem I am having is DNS/firewall related. However, I am not making any progress on it.

The problem is that I can e-mail internally, I can receive e-mail from outside my firewall, but when I send e-mail addressed outside, it just sits in the external queue and eventually times out.

My setup is a W2k domain controller which is running my DNS server, Exc2K is running on a seperate machine with w2k. SP2 for W2k, SP1 for Exchange. I have an MX record in DNS for my e-mail server.

I have looked through most of Technet's documentation on DNS and Exchange and I am not sure what I am not doing right. Any comments or suggestions would be appreciated. You can send to me privately if you wish at: rdavis@islandinstitute.org

Thanks in advance,

Rich

Post #: 1
RE: A little DNS help needed - 14.Nov.2001 1:10:00 AM   
Lee Gibson

 

Posts: 32
Joined: 26.Sep.2001
From: London
Status: offline
Hi Rich,

What you need to do is either setup your exchange box or your internal DNS to forward external requests. This can be done by:

1) Open internal DNS, Right click on your server, go to properties then forwarders, type in the IP of your ISP's DNS server or a DNS bos you can ping.

or

2) Go to the Exchange virtual SMTP options, delivery, advanced, DNS and type in your ISP's external DNS server.

Lee


(in reply to rldavis622)
Post #: 2
RE: A little DNS help needed - 14.Nov.2001 5:46:00 PM   
rldavis622

 

Posts: 6
Joined: 1.Nov.2001
From: Maine
Status: offline
Lee,

Thanks. I dopuble-checked my DNS settings and I am setup per #1 below. My e-mail server does DNS requests to my primary server, and it forwards any requests it can't resolve. I pinged the DNS servers that I had listed in the forward section fine.

Additionally, I have my Connection Control relay restrictions for my SMTP Virtual Server set to the Only List Below with Granted set to my DNS Server and to my firewall's external address.

Any other thoughts or references I can check out.

Thanks,

Rich

quote:
Originally posted by Lee Gibson:
Hi Rich,

What you need to do is either setup your exchange box or your internal DNS to forward external requests. This can be done by:

1) Open internal DNS, Right click on your server, go to properties then forwarders, type in the IP of your ISP's DNS server or a DNS bos you can ping.

or

2) Go to the Exchange virtual SMTP options, delivery, advanced, DNS and type in your ISP's external DNS server.

Lee



(in reply to rldavis622)
Post #: 3
RE: A little DNS help needed - 15.Nov.2001 11:59:00 AM   
Lee Gibson

 

Posts: 32
Joined: 26.Sep.2001
From: London
Status: offline
Hi Rich,

can you ping external addresses i.e amazon.com?

Lee


(in reply to rldavis622)
Post #: 4
RE: A little DNS help needed - 15.Nov.2001 2:41:00 PM   
rldavis622

 

Posts: 6
Joined: 1.Nov.2001
From: Maine
Status: offline
Lee,

Yes, I can ping external addresses. Some time out, others go right through.

When I test my setup these are the ports I open on my firewall.

25 TCP for my Exchange server.

53 TCP/UDP for DNS and I have it going to my primary/DNS server.

88 TCP/UDP to the primary server.

135 TCP for Exchange

389 TCP/UDP for Exchange

445 TCP for Exchange

3268 TCP for Exchange

1025 TCP/UDP for Exchange.


Are these the proper ports to open (I took this from Knowledgebase Article Q280132)


Thanks,

Rich


(in reply to rldavis622)
Post #: 5
RE: A little DNS help needed - 15.Nov.2001 4:35:00 PM   
rldavis622

 

Posts: 6
Joined: 1.Nov.2001
From: Maine
Status: offline
I got looking at my message tracking logs. The address that it puts in as the return address is userid@machinename.domainname.org. Should it just be userid@domainname.org? If so, how do I switch that?

Thanks,

Rich


(in reply to rldavis622)
Post #: 6
RE: A little DNS help needed - 16.Nov.2001 12:42:00 AM   
Lee Gibson

 

Posts: 32
Joined: 26.Sep.2001
From: London
Status: offline
Sorry that all looks fine.

Anyone else?

Extreme lack of admins on this board.

I'll have another think when I've had some sleep....


(in reply to rldavis622)
Post #: 7
RE: A little DNS help needed - 16.Nov.2001 3:29:00 PM   
rldavis622

 

Posts: 6
Joined: 1.Nov.2001
From: Maine
Status: offline
I got things all sorted out. Thanks a bunch Lee for all your suggestions. They got me thinking in a different way!

Thanks a million!


Rich


(in reply to rldavis622)
Post #: 8
RE: A little DNS help needed - 21.Nov.2001 1:38:00 AM   
mrperry

 

Posts: 7
Joined: 21.Nov.2001
Status: offline
Are you using a Cisco router ?
Check nat table
had an issue with Win2k E2k
Can you send to anyone?

(in reply to rldavis622)
Post #: 9

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