How to manage Reverse DNS

Getting Started

Access to the Broadband control panel is available through the My Account link from the Gradwell homepage or by accessing http://www.gradwell.com/myaccount

In order to login, enter your Gradwell registered email address and password and click on the Login button.

If you have forgot your password, then you can click on the Forgotten your password? link to recover it - this will send an email to your registered email address containing your new login instructions.

Once you have logged into the portal, as a Broadband Customer you will see the following screen

Select the Edit Reverse DNS option from the left hand menu, and the following screen will then appear

You will see a list of IP's that are assigned to your account that you can set the Reverse DNS on, remember that the first and last IP in a block are reserved and as such will not be shown.

The value that you enter needs to be fully qualified , as such the entry needs to end with a full stop.

• mail.myserver.com. is a valid FQDN (Fully Qualified Domain Name)
• mail.myserver.com is not a valid FQDN and as such will cause errors in the DNS

For example, if you have a mailserver configured on a static IP of 79.135.98.5 , you would create an A record in your domains zone file for this such as mail.myserver.com IN A 79.135.98.5

The output from the UNIX host command would be

~$ host mail.myserver.com

mail.myserver.com has address 79.135.98.5

mail.myserver.com mail is handled by 10 mail.myserver.com

However, if you did host 79.135.98.5 the command would return

~$ host 79.135.98.5

5.98.135.79.in-addr.arpa domain name pointer 79.135.98.5.dsl.gradwelldsl.co.uk.

Setting the FQDN in the Broadband Control Panel to mail.myserver.com. would return

~$ host 79.135.98.5

5.98.135.79.in-addr.arpa domain name pointer mail.myserver.com.

This would ensure that mail delivery is not rejected by servers due to the reverse DNS not matching.