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We switched from Kerio Control software to the Control Box. It has this nasty habit that when the Intrusion Protection is turned on, the CPU jumps to 100%, and we lose the Internet. We have had the box a couple of months, and it didn't start out this way. It had this problem for a week in May, disappeared, and is now back. Any ideas?

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First thing I would do is check snort.conf and see what your config search-method is set to.

I am not too familiar with the setup of the Control Box. I don't know if it uses a snort.tmpl as the master to build the snort.conf on each startup of the service like the software version, or if there is a single, static snort.conf file. If it is the former case, look for the snort.tmpl file.

If you have enough memory on the box, try and set config search-method to "ac-bnfa-q search-optimize".

It will use up more memory, but is faster. If there isn't enough memory, you can throttle back to trying "lowmem search-optimize", but the lowmem method is generally regarded to be slower than ac-bnfa.

Second thing is that you may have a rule in your Snort rules that is causing this problem. It's unlikely, because normally the Kerio snort rules are vetted to make sure there are no issues.

I would also take a look at the outgoing traffic on your network. Is there something inside that is spamming out huge numbers of connections all at once, such as Skype? If you've got a huge number of connections, or a very large transfer / high speed transfer, obviously Snort is going to suck up more CPU cycles as it tries to handle all of the traffic.

That's all I can suggest offhand. I hope it helps a little.

EDIT: Though of one other thing - look in your snort.conf file are see what your HOME_NET is set to. If it is only the external IP of the Kerio Box, edit the snort.tmpl file to change it such that you have something like this:
(say your internal LAN address range is

[Updated on: Fri, 17 June 2011 15:26]

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