MX question
Barry Margolin
barmar at genuity.net
Mon Apr 8 23:29:59 UTC 2002
In article <a8t8dq$pt2 at pub3.rc.vix.com>,
William Stacey <staceyw at mvps.org> wrote:
>What the advantage to doing this:
>;; ANSWER SECTION:
>microsoft.com. 6789 IN MX 10 maila.microsoft.com.
>microsoft.com. 6789 IN MX 10 mailb.microsoft.com.
>microsoft.com. 6789 IN MX 10 mailc.microsoft.com.
>
>;; ADDITIONAL SECTION:
>maila.microsoft.com. 6789 IN A 131.107.3.125
>maila.microsoft.com. 6789 IN A 131.107.3.124
>mailb.microsoft.com. 6789 IN A 131.107.3.122
>mailb.microsoft.com. 6789 IN A 131.107.3.123
>mailc.microsoft.com. 6789 IN A 131.107.3.121
>mailc.microsoft.com. 6789 IN A 131.107.3.126
>
>As opposed to just listing more MX's like:
>;; ANSWER SECTION:
>microsoft.com. 6789 IN MX 10 maila.microsoft.com.
>microsoft.com. 6789 IN MX 10 mailb.microsoft.com.
>microsoft.com. 6789 IN MX 10 mailc.microsoft.com.
>microsoft.com. 6789 IN MX 10 maild.microsoft.com.
>microsoft.com. 6789 IN MX 10 maile.microsoft.com.
>microsoft.com. 6789 IN MX 10 mailf.microsoft.com.
>
>;; ADDITIONAL SECTION:
>maila.microsoft.com. 6789 IN A 131.107.3.125
>mailb.microsoft.com. 6789 IN A 131.107.3.124
>mailc.microsoft.com. 6789 IN A 131.107.3.122
>maild.microsoft.com. 6789 IN A 131.107.3.123
>maile.microsoft.com. 6789 IN A 131.107.3.121
>mailf.microsoft.com. 6789 IN A 131.107.3.126
>
>Is the advantage round-robin?
Some mailers have a limit on the number of equal-preference MX's that
they'll try, possibly only one. So if a server only tries one MX record,
it will still see both addresses corresponding to that server, and may try
both addresses. If you had six MX records, only one address would be tried
in this case.
--
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
More information about the bind-users
mailing list