Change DNS in DHCP Server

1. Open the DHCP Console.
2. Open your Server.
3. If applicable open the IPv4 or IPv6.
4. Open the relevant scope.
5. Click on the Scope Options.
6. Click on the 006 DNS Servers option, right click and select properties.
7. Higlight the unwanted IP address and click remove.
8. Insert the new IP address and click add.
9. Click Apply then OK


MX record and its priority

These are special resource records for mail routing. An MX (Mail eXchanger) record specifies a domain name and an associated computer, the “mail exchange”, which is able to deliver e-mail to an e-mail address with this domain name.

A Sample MX record that you can register with 1&1 looks like this:

Domain Name MX1: mail.domain.com Priority: 10 IP Address 192.168.1.1
Domain Name MX2: backup.domain.com Priority: 20 IP Address 192.168.1.2
Domain Name MX1: mail.otherdomain.com Priority: 30 IP Address 12.14.1.10
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How to Flush DNS cache in Mac OS X

Flushing your DNS cache in Mac OS X is actually really easy, and there are two different commands to use, one for Leopard and for Tiger. Depending on your version of OS X, open your Terminal and follow the appropriate directions below:

Flush DNS Cache in Mac OS X 10.5, Mac OS X 10.6, or OS X 10.7 Lion
Launch Terminal and issue the following command:

dscacheutil -flushcache
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