[CentOS] DNS lookup delay with centos & postfix
John R Pierce
pierce at hogranch.com
Wed Jul 25 21:55:16 UTC 2012
On 07/25/12 1:57 PM, Steve Lindemann wrote:
> Anyone have any ideas for why nagios would have trouble testing smtp on
> the email server when the primary dns goes offline? I'm not even sure
> where to look or who else would make sense to ask the question of on
> this one. I'd appreciate any insight anyone out there has on this.
DNS lookups default to using 53/udp, and only use 53/tcp for zone
transfers. could it be 53/udp is being lost/blocked between this host
and your ns1 ?
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
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