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Why there are multiple reverse lookups of the default gateway on my syslog server through the primary DNS server?

Solution Unverified - Updated 2015-06-01T12:54:52+00:00 -

Issue

One of our syslog servers trying to do a reverse lookup of its default gateway through the primary DNS server. This behaviour is observed only when syslog daemon is running. We would like to understand why a syslog server which is meant to collect logs is doing a reverse lookup?
Why a syslog server which is meant to collect logs is doing a reverse lookup?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
syslog

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