Re: Changing IP of Mail server - Any gotchas?

From: Deji Akomolafe (deji_at_REMOVEPADDINGakomolafedotcom)
Date: 09/02/04

  • Next message: Tanveer: "Through Ms-outlook or Exchange server ?" 
    Date: Wed, 1 Sep 2004 22:14:55 -0700

    >> I'm wondering why this would be an issue for cable providers and not DSL
    providers?
    This is one of the reasons people stay on DSL in spite of the speed
    advantage of Cable. Static IP is another reason. Not many Cable providers
    give you static.

    >>Would it be possible to avoid any loss at all by creating an additional A
    record for the cable IP, supplementing the DSL IP Host, and adding this
    entry to the MX record?
    I have not read your OP completely, but this is what I'd do:
    I'll set the TTL on my MX records to about 60 minutes or less. I'd do this
    at least 2 days before I intend to completely switch over to the new
    server/IP. What this does for you is make sure that the old record will
    expire quickly on all and whoever is looking for you will have to requery
    your DNS every hour. When you finally switch over, any mail server that may
    have cached your records more than 1 hour before would have to look for you
    again and it will get your new MX. Where the TTL has not expired yet, mail
    will only be delayed for one hour at most while the server retries until the
    cached TTL expires.

    I hope I haven't confused you :) 

    -- 
Sincerely,
Dèjì Akómöláfé, MCSE MCSA MCP+I
Microsoft MVP - Directory Services
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>
> "Ace Fekay [MVP]"
> <PleaseSubstituteMyActualFirstName&LastNameHere@hotmail.com> wrote in
> message
>
> > First, will this be a business class cable connection? Cable companies
> > (especially Comcast) are known to stop incoming SMTP packets to their
> > subscriber base to prevent folks from running mail servers (among other
> > services being blocked as well).
>
> I'm not using Comcast, but one of the techs I spoke to with this service
> mentioned at one point the prohibition against mail or game servers. I had
> no idea this would be an issue or I'd never have installed it. There's
> nothing in their promotional materials mentioning it. I'm wondering why
this
> would be an issue for cable providers and not DSL providers?
>
> > Second, I'm assuming that your mail server is behind a NAT?
>
> Yes, sorry, I didn't mention that. Using a NetGear ProSafe firewall/router
> with NAT and DHCP (reserving a static IP for the domain's name server).
>
> > If so, there would be really nothing to change internally
>
> Ah, ok. That was the question, thanks.
>
> > DNS propogation may take about 24-72 hours.
>
> Ouch. Hmm, this presents problems, I can't afford to lose any incoming
mail
> in the interim. Would it be possible to avoid any loss at all by creating
an
> additional A record for the cable IP, supplementing the DSL IP Host, and
> adding this entry to the MX record?
>
> Thanks!
>
> Bob
>
>
  • Next message: Tanveer: "Through Ms-outlook or Exchange server ?"

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