Dynamic IP & cache DNS

[Cricket Liu]

> Some websites offer services to give a dynamic IP address a domain name.
> I Tried this, it works very well. But usualy, DNS servers use a cache,
> and then, I'd like to know how the update can be such fast (some
> seconds). Is there an insctruction to avoid DNS entries to be cached? Or
> what ?

Each resource record in DNS carries a time-to-live field
with it, which tells name servers how long they may cache
that record.

For example, in this record:

www    60    IN    A    10.0.0.1

the TTL field instructs name server to cache the record
for 60 seconds.

cricket

Men & Mice
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