max-ncache-ttl

England, Robert england at northamerica.exchange.agere.com
Thu Nov 8 21:37:38 UTC 2001


 
We seem to be experiencing an steady stream of DNS domains that we are not
able to locate. A fair amount of these DNS domains are valid domains, they
resolve on one of my DNS server but not the other? 
For one reason or another at any given time one of our two DNS servers that
handle all external DNS look-ups caches a negative response. 
I have set "max-ncache-ttl"  to 900 this seems to have helped, but not
eliminated the intermittent lookup failure for a valid domain name. 
Is it wise to lower the limit to say 600 or 300? I know doing so will
increase the load on the servers but is there any other reason why I should
not do that?
 
One other question, As I stated earlier we have 2 DNS server that handle all
external DNS lookups. Is there that much latency on the internet that a
request times out with out being able to find the name on the first try? Or
are there a lot of DNS domains and or DNS servers that are not configured
correctly? I sometimes find myself troubleshooting other companies DNS
issues because it affects our company's ability to get important email
though to a partner. Any thought would be helpful.
 
RCE
 




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