On Friday 08 November 2002 03:36 am, Joon Guillen wrote:
> On Fri, 2002-11-08 at 15:54, Pong wrote:
> Egad! I meant 2-3 days. So sorry :D
this reminds me, from time to time we help companies transition their
DNS and other servers (when they switch ISPs, or for whatever reason) .
usually we're lucky and we can transition slowly (both the old
and new servers are still up, people with the old DNS connect to the
old server, people with the new DNS connect to the new server, the
new server runs fetchmail to move mail from the old server to the
new server).
i'm thinking this luck will run out at some point though. so my question
is, if a quick transition is required (little or no overlap is possible
between when the old ISP or old IP numbers are still up and when
the new ISP or new IP numbers come up), is it sufficient to modify
the DNS zone information (in particular the TTL and the SOA:
refresh, retry, expire and minimum TTL settings) to small numbers
so as to avoid this 2-3 day delay?
so, one week before transition, we change the TTL and other numbers,
to something small (10 minutes, 1 hour, 3 hours, whatever we're
comfortable with) and then when we do the transition there will only
be a short disruption?
theoretically, that should work. but what happens in practice? are there
broken DNS clients or caching servers out there that don't follow the RFC
and so it's possible that there will be 2-3 day disruptions anyway? are
any of those broken caching servers (if there are any) in use by huge
ISPs (important for deciding whether to spend the money on longer
transitions, or whether it's OK to go with the quick transition)?
tiger
--
Gerald Timothy Quimpo tiger*quimpo*org gquimpo*sni-inc.com tiger*sni*ph
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