Sorry... Try with some tool to see what type of traffic. (Munin,cacti,ganglia, etc) Is in your lan? Diego Sanchez Sent from my mobile -----Original Message----- From: diegors at gmail.com Date: Tue, 3 Dec 2013 20:42:39 To: CentOS mailing list<centos at centos.org> Reply-To: diegors at gmail.com Subject: Re: [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 _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos Diego Sanchez Sent from my mobile