Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-03 Thread Warren Young
On Jul 1, 2017, at 3:00 AM, Pete Biggs wrote: > >> In your experience, what's the "longest" a DNS cache is configured to >> keep outdated information? A day? A week? A month? Longer? >> > That is controlled by the TTL (time to live) entry. …which is often under your control

Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Pete Biggs
> You should check to see if your old SOA is still showing themselves > as authoritative for your domain. If they are, then anyone who uses > their nameservers will still get the old record(s) for your domain. > > If they are still showing themselves as authoritative (which I think > is the

Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Richard
Original Message > Date: Saturday, July 01, 2017 10:57:42 +0100 > From: Pete Biggs <p...@biggs.org.uk> > Subject: Re: [CentOS] Physically moving a mail server vs. cached DNS > > On Sat, 2017-07-01 at 11:37 +0200, Nicolas Kovacs wrote: >>

Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Pete Biggs
On Sat, 2017-07-01 at 11:37 +0200, Nicolas Kovacs wrote: > Le 01/07/2017 à 11:00, Pete Biggs a écrit : > > That is controlled by the TTL (time to live) entry. A DNS server must > > refresh it's cache within the TTL for the entry. Using the '-a' option > > to host will give you more information: >

Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Nicolas Kovacs
Le 01/07/2017 à 11:00, Pete Biggs a écrit : > That is controlled by the TTL (time to live) entry. A DNS server must > refresh it's cache within the TTL for the entry. Using the '-a' option > to host will give you more information: So I would have to use the -a option with the old DNS server, to

Re: [CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Pete Biggs
> > In your experience, what's the "longest" a DNS cache is configured to > keep outdated information? A day? A week? A month? Longer? > That is controlled by the TTL (time to live) entry. A DNS server must refresh it's cache within the TTL for the entry. Using the '-a' option to host will give

[CentOS] Physically moving a mail server vs. cached DNS

2017-07-01 Thread Nicolas Kovacs
Hi, I just moved my main mail account and web content from a low-cost (low-quality) provider to my own root server running CentOS 7. I transferred the domain name from DNS management to my registrar, configured BIND, Apache, Postfix, Dovecot, NTP, SELinux, etc. Now things are running rather