Date: Sat, 15 Sep 2001 01:06:01 -0700 From: "Brian" <bri@sonicboom.org> To: <freebsd-isp@FreeBSD.ORG> Subject: Re: Mail Server - Round Robin Load Distribution Message-ID: <00be01c13dbd$86a5a340$3324200a@sonicboom.org> References: <20010915080113.985.qmail@web20101.mail.yahoo.com>
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u can do multiple serfvers with the same mx preference, to achieve some
distribution that way. Last I checked, using a cname for an mx record was a
big nono, causing rfc memorizing internet purists all around to convulse
madly..
Brian
----- Original Message -----
From: "Fabrizio Ravazzini" <freefabri@yahoo.it>
To: <freebsd-isp@FreeBSD.ORG>
Sent: Saturday, September 15, 2001 1:01 AM
Subject: Mail Server - Round Robin Load Distribution
> Hello all,I'm doing a Mail server using two machines
> which shares the same disk array via NFS
> where there are the users maildirs
> (Q-mail,vchkpw,courier-Imap,sqwebmail).
> I want to make this cluster using DNS-RoundRobin.
> Reading the book DNS&BIND (O'Reilly) page 274, if I
> insert two A-Records with two CNAME I can make
> the round Robin, but this for ftp,http or whatever
> server,but I think NOT Mail Servers.
> Reading at the beginning of the book,instead, in the
> MX record section I understood that multiples
> CNAME for Mail servers are invalid, so I can only put
> two MX-record for two machines serving the same
> domain, but in this way only the first of the two MX
> serves the requests and when it goes
> down the other takes care of the service.
> So,the question is, can I still have load distribution
> with a mail server?
> Suppose that the service domain is mail.com, so you
> can send mail for example to john@mail.com
> and the two machine of the cluster are:
> one.mail.com ( Ip: A.B.C.D )
> two.mail.com ( Ip: X.Y.Z.K )
>
> Can I insert in DNS this following records?:
> one.mail.com 60 IN A A.B.C.D
> two.mail.com 60 IN A X.Y.Z.K
>
> mail.com 60 IN CNAME one.mail.com
> mail.com 60 IN CNAME two.mail.com
>
> or have I to insert these?:
> one.mail.com 60 IN A A.B.C.D
> two.mail.com 60 IN A X.Y.Z.K
>
> mail.com IN MX one.mail.com
> mail.com IN MX two.mail.com
>
> In the second case I don't have any Load Distribution,
> all the traffic goes to the "one.mail.com"
> till it goes down and that's not what I want.
> Can someone help mein this dilemma?
> or tell me how to do this type of load distribution?
> Many thanks
>
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