Best solution with snort for voip floods

[Luis Daniel Lucio Quiroz <luis.daniel.lucio () gmail com>]

Maybe this has been asked many times, i dont know.

Im having many UDP (unknown protocol - ntop markes them as unknown) flood
and the worst thing seems that server is answering (icmp and answers).
Anyway, I was wondering a solution with snort+snortsam+iptables in order to
only allow UDP (rtp port range) from IP's that are registered.

So, if extension is registered from ip 1.1.1.1, i will allow to reach ports
10000-20000/udp (example), if it doesnt i will drop packet.

how can this be done?

Regards,

LD

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