High recursive client counts

Jason Brandt jbrandt at fsmail.bradley.edu
Wed Mar 26 12:09:17 UTC 2014

The code on our FWSMs isn't the latest release, so that could be part of
the issue, but it's been about 16 hours now since I shut it off, and so far
so good.  I would say though with the other load on our firewalls, it's
highly possible that they were being overloaded.  Unfortunately our MRTG
isn't setup to track firewall CPU, so I can't say for sure.


On Wed, Mar 26, 2014 at 4:02 AM, Sam Wilson <Sam.Wilson at ed.ac.uk> wrote:

> In article <mailman.2530.1395774135.20661.bind-users at lists.isc.org>,
>  Jason Brandt <jbrandt at fsmail.bradley.edu> wrote:
> > For now, I've disabled DNS inspection on our firewall, as it is an
> ancient
> > Cisco firewall services module, and that seems to have stabilized things,
> > but it's only been 30 minutes or so.  Until I get a few days in, I'll
> keep
> > researching.
> We used to run DNS inspection on our FWSMs.  We didn't notice any issues
> with DNS resolution per se, but we did find that turning it off dropped
> the FWSM CPU from ~70% to less than 30%.  We're not aware of any issues
> that using DNS inspection might have caused.
> Sam
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Jason K. Brandt
Systems Administrator
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