Preparing Change of an IP address
Barry Margolin
barmar at alum.mit.edu
Thu Jun 22 23:57:46 UTC 2006
In article <e7ehte$2d8k$1 at sf1.isc.org>, jochen.wiedmann at gmail.com
wrote:
> Hi,
>
> we are preparing the change of a web servers IP address. I know, at
> that point I have to expect that clients will get a wrong IP address
> for a certain time frame. My intent is to get this time frame as short
> as reasonably possible.
>
> Currently my zone files have the following header:
>
> @ IN SOA foo.com. root.foo.com. (
> 2006030500 ; Serial
> 28800 ; Refresh
> 14400 ; Retry
> 3600000 ; Expire
> 86400 ) ; Minimum
>
> Can anyone recommend good values, which I would enter for a few days?
If you make use of NOTIFY to update your slave servers, you don't need
to modify your SOA record at all.
In advance of the change, enter an explicit TTL on the A record that
you're going to change, and set it to something short. After the
change, once you're sure you're not going to change it back, you can
remove this explicit TTL and let it inherit the default from the $TTL
statement.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
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