Monthly Archives: February 2012

Detecting the source of a DOS attack with Cisco Netflow

A very late night call last night/this morning was a support ticket for a none responsive LNS (L2TP Network Server). The LNS normally terminates around 1000 VPDN sessions but was dropping just about all the traffic. A cursory glance at … Continue reading

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Using a RAMdrive with MIMEDefang on FreeBSD

Before I deploy the new spam scanning servers which run a combination of: Sendmail MIMEDefang SpamAssassin Milter-Greylist I’d like to set the spool directory to run on a ramdrive to increase the speed an efficiency of the system. When MIMEDefang … Continue reading

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MySQL innodb buffer pool size issues

I’m currently archiving some database records from our AVS logging platform. My previous technique was to rename the logging table and create a new one, leaving the renamed table to be cut up as required.  I had to do it … Continue reading

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MIMEDefang – processing the valid users list ( filter_recipient() )

I’m rebuilding our spam scanning platform at the moment and making some changes/improvements along the way. One of our issues was that we want to show customers ‘just how bad it is’ without spam scanning and so would like to … Continue reading

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