Hello together!

I wanted to test my network and all servers witch are connected over a 100 mbit switch.
But as soon as I start with ping -fb w.x.y.255 nothing goes more. I can't change between the tty consoles for change from tty 12 to tty 1. Is that normally? I've installed everywhere Kernel secure and the grsec patch and I have gradm activated . But the server freeze.I always thought, that the grsec patch was for to prevent this or to prevent that a service used so much memory and so blocked the computer?


Can someone help me?


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