[asterisk-users] DNS Query Overload

[Mik Cheez]

What you should do, assuming that each DNS request is invalid and 
returns nothing, is add a fake domain on your box that all of these 
requests will point to.  That is, if mydomain.com is the DNS name it's 
looking up, add mydomain.com to a named server on the same box.  Make 
sure you include forwarders into the named.conf file pointing to your 
DNS servers, as well as add a zone for mydomain.com.

zone "mydomain.com" {
         type master;
         file "mydomain.com";
};

In the mydomain.com zone, add a wildcard A entry which will always 
return the localhost address:

*.mydomain.com. IN      A       127.0.0.1

Then point your DNS settings to localhost so all requests will go 
through the local DNS server, and reset Asterisk.

In resolv.conf:

nameserver 127.0.0.1
search mydomain.com

This is essentially a hack...I've had the same issue in the past, but 
was unable to get an answer as to why it's doing this.

Mik

Grey Man wrote:
>> Most distros come with a caching daemon.
> 
> Still that's not really the point... If Asterisk has all of a sudden
> developed a habit of sending high volumes of nonsense DNS requests
> then it's a serious issue. Besides if the requests are different for
> each call the caching server is not going to help much and the
> downstream ISP is going to notice sooner or later.
> 
> Regards,
> 
> Greyman.
> 
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