Question

DNS requirements to change public IP address on an exchange 2003 server

Asked by: joewy1

i have an exchange server on my internal network. i am changing my internet providers which means i am changing my static IP block. what i am not sure about is.

a. the process of getting dns entries changed.
should i get my existing dns provider to change the records then transfer the SOA to my new IP provider?
or transfer the SOA and have the new service providers make the changes.

b. what DNS records need to exist for an exchange server to function?
    are there any suggestions for dns setup to reduce spoofing and/or spam?

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Asked On
2007-06-07 at 07:17:00ID22619127
Tags

ip

,

change

,

exchange

,

address

,

public

Topics

Network Security

,

Exchange Email Server

,

Domain Name Service (DNS)

Participating Experts
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Points
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Answers

 

by: poweruser32Posted on 2007-06-07 at 07:20:30ID: 19233750

mx records need to be changed for exchange they consist of
1.an ip addresss which you will change
2.the host name which you will probably keep
you will also have to change any dns servers you have listed in your dns forwardres on your own internal dns server to your new isps dns servers

 

by: PowerITPosted on 2007-06-07 at 07:22:58ID: 19233775

a: If your exchange is to the public just an SMTP endpoint then the only thing you have to do is ask your DNS provider to change the MX record to reflect the new IP adrress.
If you are changing ISP and DNS provider at the same time, e.g. when your domain registration is handled by your ISP, then you just have to ask to change the MX record at the same time they activate your new internet connection.
b: DNS has no ability to reduce spoofing or spam. It's not designed with that in mind.
DNS records: if it's only SMTP then you only have the MX record. If you also use OMA or OWA then you also have an A record.

J.

 

by: icorpsPosted on 2007-06-07 at 07:25:31ID: 19233789

All the above is correct.  

In order to have a very seamless change, I would recommend the following:

Add a second A (address) record.  Such as smtp2.domain.com and have this point to the new IP you will assign to your mail server.  Then have a secondary MX record created which will point mail to this new A record.

Give this a few days to propogate.  Now when you make the change, email will not be able to contact the primary MX  and will then route to the secondary.  Once you are on the new connection, just make the secondary record the primary and remove the other record.  You can also adjust the A records as needed.

 

by: Donnie4572Posted on 2007-06-07 at 07:58:52ID: 19234155

First,
You should plan for at least 24 hours for the records to update through the internet and most will say 72 hours. I usually plan public DNS changes for Friday night and alert everyone for up to 72 hours for interruption.

Exchange needs the following public dns records:

For outgoing mail:
PTR reverse lookup record for the sending mailserver
A Host record for the sending mailserver
Note: (server fqdn should match these records)

For incoming mail:
MX record for receiving mailserver (cost of 10)
A host record for receiving mailserver
A host record for OWA/activesync/rpc over http for receiving mailserver
Note: (these two A records can be the same or different but there needs to be one that matches the MX record)

PTR records are usually managed by your ISP. A and MX records are manahed by your hosting company unless you manage your own public dns.

As for spoofing, there is no defense. You could setup a SPF record but I don't think this is working that well yet.
http://www.openspf.org/

As for spam, dns records can not help you there. However, I have noticed spammers using a secondary MX record and bypassing the primary. I suppose they think the secondary receiving mailserver could be less secure and attempt to use it.
For example, If you have two mailservers primary and secondary your primary's MX record would have a cost of 10 and your secondary would have a cost of 20. In this case the only connection to the secondary would be if the primary is down.

Donnie





 

by: Donnie4572Posted on 2007-06-07 at 08:08:16ID: 19234236

>"should i get my existing dns provider to change the records then transfer the SOA to my new IP provider"<
You should have the second ISP live at your location. Change the dns records and migrate the firewall/gateway at the same time.

>"or transfer the SOA and have the new service providers make the changes."<
The only change the new service provider will make is setting up the new PTR record unless they are also you hosting company.

20120131-EE-VQP-002

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