DNS Caching Issue

[TCPWave Customer Care]

lame-ttl is an option in named.conf which defines the number of seconds
to cache lame delegations or lame servers i.e servers which are marked
as authoitative but do not respond as authoritative. Set that option to
0 so that you will never cache a bad delegation. 

max-ncache-ttl sets the maximum time (in seconds) for which the server
will cache negative (NXDOMAIN) answers. Set this option to 60. 

See if that helps.

On Mon, 2011-07-25 at 08:22 -0600, Sathyan Arjunan (sarjunan)
[CONTRACTOR] wrote:
> Recent days, I am facing frequent caching issues with my DNS servers
> which are responsible for recursive lookup to external queries. As a
> temporary solution, we used to refresh the named daemon to clear the
> cache. To isolate this issue we upgraded the BIND to “BIND 9.7.3” but
> even after the upgrade issue repeats. 
> 
>  
> 
> If I do a nslookup for “mail.sin.gpi-g.com”, it fails. 
> 
>  
> 
> nslookup mail.sin.gpi-g.com
> Server:         dnsserver
> 
> Address:        x.x.x.x#53
> 
>  
> 
> ** server can't find mail.sin.gpi-g.com: SERVFAIL
> 
>  
> 
> To fix this I have to restart the named daemon in caching DNS server.
> Once I restart, the lookup resolves well. However the issue appears
> again in few days. Any thoughts?
> 
>  
> 
> nslookup mail.sin.gpi-g.com
> 
> Server:         dnsserver
> 
> Address:        x.x.x.x#53
> 
>  
> 
> Non-authoritative answer:
> 
> Name:   mail.sin.gpi-g.com
> 
> Address: 203.175.163.180
> 
>  
> 
> Regards,
> 
> --Sathyan
> 
> 
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