Elwyn wrote:
On Sunday 04 Sep 2005 18:47, Mikkel L. Ellertson wrote:
Now, when it comes to flushing the DNS cache, it depends on what
software you are running. If you are running a local name server, such
as dnsmasq or tmdns, about the only way I know to flush the cache is to
restart it.
Mikkel
I've had a lot of my emails be delayed for a few days when sending to a
mailing list. I have been advised by the system administrator for that list
that I would need to flush out my DNS cache.
When I send email I use my ISPs SMTP server, so wouldn't they be the one that
would need to flush their cache??
Cheers
Elwyn
If you are relaying through their mail server, then yes, they would be
the ones that need to flush their cache. The only DNS entry your mail
server would look up is their mail server. The other thing is that
unless their name server is set up wrong, it is susposed to update the
addresses automaticly. Every DNS entry has an "experation date" on it.
When you get the IP address from a name server, you also get a TTL value
that says this entry is only good for so long - after that, you need to
get it again. But sometimes an ISP will set up their local name server
so that it ignores the TTL, and keeps entries for at least a set period.
Another problem comes when the name server server has too larger a TTL,
and changes its IP address. It can especial be a problem for people
using dynamic DNS where they set it too large for how often their ISP
gives them a new IP address. They bet a new IP address, but the old one
is still in a lot of name server caches.
Mikkel
--
Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!
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