Re: Redundant mail server
On Sun, 13 Feb 2005 22:32:19 -0800, Curtis Vaughan <curtis@npc-usa.com> wrote:
>
> On 13 Feb, 2005, at 22:20, Nicolas Patik wrote:
>
> > On Sun, 13 Feb 2005 22:10:18 -0800, Curtis Vaughan
> > <curtis@npc-usa.com> wrote:
> >> Not sure whether redundant is the right word. Anyhow here's the
> >> question:
> >>
> >> We have an office in the US and overseas.
> >> The mailserver used by the overseas office is in the US office. Of
> >> course, occassionally there may be downtime for the US office. So the
> >> overseas office has this idea that we could set up a backup mail
> >> server
> >> in their office. They would then use the backup mail server should the
> >> server in the US office be down.
> >>
> >> Well, I've explained to them that that won't really work - which the
> >> IT
> >> admin over there agrees with, but then keeps pursuing the question.
> >> So,
> >> I want to know definitively whether I am right or not.
> >>
> >> The problem as I see it is this. Fine they have a redundant server,
> >> but
> >> it wouldn't be able to recieve any mail, because the domain name for
> >> the mail server points to the US office. There is no way that I'm
> >> aware of to rapidly switch the IP address of the mail's domain name
> >> and
> >> then switch it back when the US office mail server is back up.
> >
> > You can add to the your DNS zone configuration any number of mail
> > servers (0,1,2,3 is the priority, it will try 0, then 1, then 2 ...):
> >
> > IN MX 0 mailUS.example.com.
> > IN MX 1 mailCH.example.com.
> > IN MX 2 mailBR.example.com.
> > IN MX 3 mailUK.example.com.
> >
> > I don't know how to configure the backup mail server to send the
> > backed up mails to the main server when it is up again.
> >
> Oh, I forgot to say that the assumption here is that all possible
> internet connectivity with the US office is down. So there would be no
> way to basically repoint incoming mail to any other server.
Ok, I guess you want to have a backup mail server for npc-usa.com and
the backup partner could be vostok1.com or vostok.pt or any other:
You have to have this configuration on your DNS zone at npc-usa.com:
IN MX 10 smtp.npc-usa.com.
IN MX 20 mail.vostok1.com.
you will also have to configure the mail server at vostok1.com to
accept mail relay for npc-usa.com.
You don't care if your internet connectivity is down, any mail servers
trying to send mail to you will query the DNS server at speakeasy.net,
and will find that mail.vostok1.com also accept mail for npc-usa.com.
>
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>
--
--Nicolas
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