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IPS Performance Problem with 100Mbit Fiber

chumbri
Hi there,

We have an ASG220 with Firmware-Version: 9.105-9 and a very strange behavior with the IPS (4507 of 15947 patterns).
Last week we did a fiber upgrade from 30Mbit to 100Mbit.

With IPS enabled we only get around 50Mbit throughput. (Tested with speedtest.net, cifs sharing and iperf)
With IPS disabled we get around 95Mbit, which is good. (Tested with speedtest.net, cifs sharing and iperf)

It makes no difference if I remove the LAN from the Local networks option in the Global IPS Settings. The problem persists.
The only solution is to disable IPS globally with the On/Off Button, to get an acceptable throughput rate.

The snort process uses around 10-20% CPU. There are no special warnings or error messages in the IPS Log.

Does anybody have an idea or recommendation?


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  • 0 in reply to chumbri
    Hello,

    - how many users?
    - What kind of traffic?
    - Also "tuned" the ips-settings/-patterns (only necessary traffic checked)?
    - Maybe active App-Control?

    Maybe you can set it to only use one instance of ips (please use searching for ssh-syntax). What about your memory usage?
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