BIND 9.3.1 Cache Server Optimization

[mayer]

----- Original Message Follows -----
> Hi,
> 
> 
> > >Nothing. Those DNS records have extremely low TTL's so it
> > constantly has >to go back to the authorative server to requery it
> for its A records.
> 
> But, some other DNS cache server located in the same IDC shows much
> better performance( one of them shows only 1.87% timeout in past 24
> hours for www.nba.com, while the new server shows 3.16%). The hardware
> platform of the new server is much better than original ones.
> Difference only exist with BIND version. The original version is
> BIND9.2.3 for Solaris (SPARC) downloaded from www.sunfreeware.com, the
> new version is BIND9.3.1 compiled with SunONE Studio9.

None of this matters. The moment the record in cache expires the server
MUST go back and ask for the record again from the authorative server.
Since nba is using akamai the nameservers are also constantly changing.
That's the whole point of short TTL's. Unfortunately people don't
understand how to use it correctly and causes a much larger overhead
on the nameservers than is strictly necessary.

Danny