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DNS and Public IPs Address

Hello I am really need your help.

My current ISP is AT&T and I am changing to another ISP because I need better speed and better price.

My new ISP sent me some information, they say that I need to do some changes on my server.  

My network is very simple, my sbs 2003 has an exchange server that download our emails from our Email provider (my server doesn't connect directly to the internet), I do not have VPN, so we have asigned IPs Public but we do not use them.

I am sending an attachment with my current router cabling and addressing diagram(from AT&T) and the values that I have on my server. Based on this information what are the changes that I need to do on my side(server).

The tecnician came and confused me about the IPs Public.

Thank you for your help
EXPERTEXCHANGEREPLACE.pdf
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Agnes Sevilla
Asked:
Agnes Sevilla
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1 Solution
 
Nick RhodeIT DirectorCommented:
You have DNS forwarders setup those will need to be removed from the DNS server for you are switching providers.

Another thing is mail will stop if your using exchange because your IP address will no longer exist.  Who hosts your MX records (your domain).  If I was going to look up your MX record it would be *example* mail.domain.com.  You would have to contact or edit these external DNS records to point to your new WAN address.  Also make sure your ISP sets up the reverse DNS for that record so mail.domain.com = 111.111.111.111 and 111.111.111.111 = mail.domain.com etc.  You will also have to change any other public DNS record like autodiscover and all that jazz also.

Also as a special note I would take that picture down.  That is some descriptive information about your environment and it could be used in a malicious manner if you know what I mean
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Agnes SevillaAuthor Commented:
Thanks for your comments.

First: How can I remove my pictures?

Second: About my Exchange: I set up this for internal. I have an Email provider so I can see emails over the internet but the exchange server can use my email provider settings(using POP3) to download our emails(for each user: user id and password) and put these emails on each user exchange mailbox.

Nobody host my MX records. My Exchange is not setup correctly I know but  I have used it like that for a long time.

In these case my current internet provider do not setup reverse DNS for my exchange.

I hope, my explanation is clear for you.  Based on this tell me please if the only change are DNS Forwarders or I need to do something else.


What about the Public IPs that they gave me? I need to do something whit these?

Thanks,

Again, how can I remove my pictures?
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Agnes SevillaAuthor Commented:
Thank you, thank you, thank you!!!
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