caching dns timed out

[Στέλλα Κορακάκη]

> Sigoura?  Ti kanones exei gia ta {udp, tcp} port 53?
> 
> > Episis dokimasa queries kai se allous dns servers. Kapoioi
> > apantane(ns1.otenet.gr) kai kapoioi xreiazontai to +time=10 gia na
> > apantisoun(foo.grnet.gr).
> >
> > Paratirisa episis oti gia to record www.koukouroukou.gr exoun ttl 5.
> >
> > www.koukouroukou.gr.           5       IN      A       192.168.1.1
> >
> > Pithanotata auto na einai to provlima kai einai mallon diko tous e?
> 
> Oxi aparaithta.  Ayto apla shmainei oti se 5 deyterolepta ta cached
> records kanoun expire (pou einai kapws mikro alla oxi kai *toso*
> problhma).

Den exw auti tin pliroforia alla sigoura o dns server exei anoixta
53/{udp,tcp} xwris kapoio custom timeout.

Tha elega oti 5'' einai polu liga opote theoritika  an oles oi
zones ston dns auton exoun 5'' tha pizei...

Pantws pisteuw oti gia na exoun ki alloi dns provlima me ton
sigkekrimeno sigoura den einai diko mou provlima.
Mporw na orisw timeout  se enan caching dns? Pio einai to default?