[CentOS] Outbound traffic spike every 30 minutes

Is inbound or outbound?
What port?
tcp or udp?


------Mensaje original------
De: Bowie Bailey
Remitente: centos-bounces at centos.org
Para: CentOS mailing list
Responder a: CentOS mailing list
Asunto: [CentOS] Outbound traffic spike every 30 minutes
Enviado: 3 de dic de 2013 19:36

Since Sunday morning, one of my CentOS servers has been generating a 
small spike of outbound traffic every 30 minutes (X:00 and X:30). It's 
not enough traffic to really cause any notice except for the fact that 
it is a very regular pattern and it started abruptly at midnight Sunday.

This server is used for mail (Courier-MTA), and DNS (Bind).  I cannot 
find anything unusual in either of those logs.  I tried grepping through 
my firewall logs, but have been unable to find anything useful there 
either.  I don't see any cron jobs that would generate network traffic.

Any suggestions how I can go about tracking this down?

-- 
Bowie
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Diego Sanchez

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