DNS - Any way to force a nameserver to update the record of a domain?

Solution 1:

Assuming your DNS server is on a PC and not a router etc:

Linux cache flush:

/etc/init.d/nscd restart

Or for distros without nscd

/etc/init.d/named restart

Windows client cache flush for individual machines:

ipconfig /flushdns

Windows server cache flush for office server (thanks to ericmayo for the correction):

1. Navigate to Administrator Tools
2. expand the server object
3. right click cached objects
4. select clear cache

Mac (possibly?!):

dscacheutil -flushcache

If you have a web GUI etc for a router, there will be an option in there somewhere.

Cross platform cache flushing as above

About DNS and caching

Solution 2:

If you are running BIND as a resolver for your office - ie. not forwarding to another a resolver.

Flush everything in the cache:

rndc flush

Flush a specific record:

rndc flushname example.com

If you are forwarding then you are at the mercy of the forwarder's cache.

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Solution 3:

With the Windows DNS just restarting the service flushes the cache. Worth a try on your office server.

JR

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Solution 4:

If your using Windows, you can use nltest.

  /DSREGDNS - Force registration of all DC-specific DNS records
  /DSDEREGDNS:<DnsHostName> - Deregister DC-specific DNS records for specified DC
      /DOM:<DnsDomainName> /DOMGUID:<DomainGuid> /DSAGUID:<DsaGuid>
  /DSQUERYDNS - Query the status of the last update for all DC-specific DNS records

And if your using WINS, nbtstat.