DNS Backup and Restore

I have Windows 2008 Active Directory integrated DNS servers. Some of the external sites are not resolving, so I added that sites entry manually in to the DNS. How can I resolve this without manual entry?.

Secondly how do I take backup of DNS server and restore in case some entries are deleted?.
sumod_jacobSenior IT ManagerAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
You can use the following command to backup DNS.

open cmd
DnsCmd DNSServerName /ZoneExport domain.com domain.com.bak

Open in new window


The backup file will be stored in the %systemroot%\system32\dns

Will.
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David Johnson, CD, MVPOwnerCommented:
add forwarders i.e. 8.8.8.8 and 8.8.4.4 to your DNS rather than just rely on root hints.
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Hypercat (Deb)Commented:
You may have to periodically clear the DNS cache.  It can sometimes get corrupted or for other reasons a stale entry in the cache can cause external sites not to resolve properly.  Restarting the DNS server service will clear the cache, or you can manually clear the cache from the DNS management console by right-clicking the server name and selecting "Clear Cache" from the menu.

You could also try this setting to protect the cache against pollution, if it's not already enabled:

https://technet.microsoft.com/en-us/library/ee649123(WS.10).aspx
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