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DNS Issues


I have a problem with DNS at one particular site.

My BT Business broadbands installed elsewhere (including on the same exchange) don't have a problem.

At this site 3-4 times a week DNS lookups start to fail, there's no apparent pattern to the failure times or network activity.


During the outage I can ping extenal DNSs but not BT's DNSs and nslookups to all DNS timeout.


The problem is rectified by rebooting the router (I'm using Draytek devices) but this is a business site so having to have the customer reboot the router several times a week is not acceptable.


Having the router configured to use BTs DNS or an extenall DNS (e.g. or makes no difference.


Anyone have any suggestions as to the problem?