how to check if your ISP's DNS servers are safe

John Denker jsd at av8n.com
Wed Jul 23 11:04:32 EDT 2008


On 07/23/2008 12:44 AM, Steven M. Bellovin wrote:
>> Niels Provos has a web page up with some javascript that automatically
>> checks if your DNS caching server has been properly patched or not.
>>
>> http://www.provos.org/index.php?/pages/dnstest.html
>>
>> It is worth telling people to try.
>>
> Those who prefer command lines can try 
> 
> 	dig +short porttest.dns-oarc.net TXT

Thanks, that's helpful.

Note that the command-line version accepts the "@server" option,
which is useful if you have to deal with a mess of primaries, 
secondaries, forwarders, et cetera:

   dig @NS1 +short porttest.dns-oarc.net TXT
   dig @NS2 +short porttest.dns-oarc.net TXT
   dig @NS3 +short porttest.dns-oarc.net TXT

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