[GTALUG] Cache DNS issues.

[James Knott]

On 11/25/2014 05:35 PM, D. Hugh Redelmeier wrote:
> | The original TTL was 24 hours.
>
> How do you know that?  Do you know the queries William Muriithi's machine 
> is making?  Do you know what DNS servers it is querying?

I was referring to earlier days of the Internet, not his system.

"The units used are seconds. An older common TTL value for DNS was 86400
seconds, which is 24 hours. A TTL value of 86400 would mean that, if a
DNS record was changed on the authoritative nameserver, DNS servers
around the world could still be showing the old value from their cache
for up to 24 hours after the change."

https://en.wikipedia.org/wiki/Time_to_live

As that article mentions, with that TTL, it would take a full 24 hours
for a change to be reflected.