That is true, but many isp's (the big isp's do not honor ttl's. Comcast, cox,
etc.
Ryan
Sent via BlackBerry from T-Mobile
-----Original Message-----
From: Bruce Robertson <[EMAIL PROTECTED]>
Date: Wed, 18 Oct 2006 10:45:20
To:Anna <[EMAIL PROTECTED]>, rlug@rlug.org
Subject: Re: [RLUG] migrating ISP connections for machine running DNS and
SMTP servers
If you have control over the SOA record for the names, then what you can
do is set the TTL to 1 minute. Then, wait however long the current TTL
is so that the whole world picks up the new TTL. You can then make the
change, and your downtime will be no longer than 1 minute. You can then
restore the TTL to whatever you want.
Bruce Robertson, President/CEO +1-775-348-7299
Great Basin Internet Services, Inc. company-wide fax: +1-775-348-9412
http://www.greatbasin.net my efax: +1-775-201-1553
Anna wrote:
> Hi.
>
> I have DNS and SMTP servers running on a machine connected to the
> internet, and I'm changing ISPs today... so I need to change the IP of
> this machine. I think my real problem is with the DNS server..
>
> The DNS server is the repository the info of a couple domains. The DNS
> servers at a (third, unrelated) ISP provides the actual authoritative
> DNS service (these servers are named by the registrar) but they query my
> machine for information updates. I really like this setup, but the
> problems involved with changing ISPs makes me question the practicality.
>
> My DNS server names the MX records for my domains. Which means, the
> SMTP servers will have some down-time while the cached DNS records out
> there get updated. This is bad, but I think unavoidable.
>
> This whole difficulty has me thinking it would be worth the while and
> cost to move these services off my little server and to some hosting
> company. I do not have time to do this now, so I have to deal with this
> little mess myself.
>
> ----------------------------------------------------
>
> This has me wishing for a way to give a machine two default routes. One
> would have a higher priority than the other for outgoing connections,
> but incoming connections would be handled for their duration on the
> device that originally accepted the connection. It seems like this
> should be a possibility, but I have never heard of a setup like this.
> Is it possible?
>
> If this is not possible then I just have to bite the bullet and accept
> some down-time... I think. Unless anyone of you has an idea. I'd love
> to hear it. :)
>
> Thanks,
>
> - Anna
>
>
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>
>
>
>
>
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