If you have control over your dns entries reduce the TTL of your primary A
record to half an hour or so, then it should propogate through four levels
of cache within two hours.
You could also use a packet filtering firewall to forward all the TCP/IP
traffic on certain ports to another machine (eg iptables on linux or a
standalone GNAT firewall)
Even if you don't care about security this scenario is a real good reason
for having a firewall/router as your front line.
d.
|---------+---------------------------->
| | "J Malcolm" |
| | <[EMAIL PROTECTED]|
| | ms.com> |
| | |
| | 01/04/2004 09:14 |
| | PM |
| | Please respond to|
| | "James Users |
| | List" |
| | |
|---------+---------------------------->
>---------------------------------------------------------------------------------------------------------------|
|
|
| To: "James Users List" <[EMAIL PROTECTED]>
|
| cc:
|
| Subject: Migrating Server to Another Box/IP
|
>---------------------------------------------------------------------------------------------------------------|
I am planning to move my domains to another box and another IP
address. Iâm well aware of the propagation delays when a domainâs IP
address changes. I need to minimize the disruption to my users and
obviously not lose any mail in the process. Is there any âbest
practicesâ for how to do this?
Details: when I actually throw the switch, some mail will begin
going to the new box fairly quickly while some mail from servers
using a cached DNS entry for the domain will continue to send to the
old box until the cached address expires, which could be a couple of
days.
Likewise, some usersâ mail program will almost immediately start
going to the new box while others may stay on the old box for a
couple of days.
So the question isâ is the right answer to just let whatever happens
happen for a couple of days, and then when the dust settles reprocess
any leftover mail on the old server to get it routed to the new
server? The obvious problem with this is the potential for mail that
wonât be seen for couple of days. Is there a tried and true better
way.
Thanks.
Jerry
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