Mx round robin issue with 4.9

Situ, Kevin Kevin.Situ at fmr.com
Wed Aug 16 12:55:09 UTC 2006


I am sure someone would be amazing we were still using 4.9.  anyway.

We are upgrading a legacy server from 4.9 to 8.x.  After the upgrade,
the email folks realize that mail flow works better.  I went back to the
old version to do test, discover that the MX records with the same
preference does not rotate in the 4.9 version. 

For example, we have these entries defined in the file:
	op.com.                IN      MX 10   mroim01.fmr.com.
	op.com.                IN      MX 10   mmkim02.fmr.com.
	mroim01.fmr.com.                IN     a 10.200.1.20  
	mmkim02.fmr.com.                IN      a 10.187.2.20.

When do nslookup against 4.9. it always retune in the order of
	op.com MX preference = 10, mail exchanger =mroim01.fmr.com
	op.com MX preference = 10, mail exchanger =mmkim02.fmr.com

When do nslookup against 8.x server, the order changes for each request,
which is round robin.

Does anyone know if there is a bug in 4.9 for MX round robin. I remember
that there was a bug in earlier version bind with round robin. I would
like to confirm that my assumption is correct.

    



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