Can we load balance traf[f]ic for CNAME records?

[Manish Rane]

Perfect this is what I was talking about, now

My IMAP and SMTP are on same server and confusion starts from there
since MX records will eventaully should have A record as well so in
that case I will be having 2 A records pointing to same IPs correct.
Woudl that casue any issue, theortically it shouldnt.

example.com   IN   MX  10 mail.example.com
example.com   IN   MX   20  mail01.example.com

mail.example.com   IN    A 11.22.33.44
mail01.example.com IN   A   55.66.77.88

imap.example.com   IN  A  11.22.33.44
imap.example.com   IN  A  55.66.77.88



On 12/14/12, Feng He <fenghe at nsbeta.info> wrote:
> 于 2012-12-14 17:14, Manish Rane 写道:
>> I understand that Mail Delivery load balance can be achieved by usingMX
>> priorities. My concern is not that, rather I am more worries about users
>> who will be using A record to configure their mail clients like IMAP or
>> POP. I am thinking on load balancing their since I want users to access
>> the both the ISPs to connect. I can have A/CNAME? record configured in
>> my zone with *lower TTL value say 180* so that if any of the link goes
>> down I can edit the zone and have the faulty entry removed which
>> eventually would cost me less downtime. That way I dont need to do any
>> configuration at client end since the A/CNAME record is gonna be the same.
>>
>> That is why I was wondering if A or CNAME can be configured for two
>> different IP addresses which also holds MX Records and thus configure
>> the load balancing by that way?
>
> There are two ways of setup that.
> the first, for example, imap.example.com has two A records,
>
> imap.example.com. 900  IN  A  11.22.33.44
> imap.example.com. 900  IN  A  55.66.77.88
>
> If one server go down, half of the users have the chance to use the
> another one.
>
> the second, imap.example.com has only one A record,
>
> imap.example.com 900 IN A  11.22.33.44
>
> when this server go down, you change the record value to another IP by
> hand. that's no problem for the clients ,but you must do it by hand. Or
> write a script to do this automatically for you.
>
> Regards.
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Thanks and Regards,
Manish R
+91-9820319967