Can someone show an example how to force snort block ssh bruteforce?

[kay <kay.diam () gmail com>]

Hi everyone

The only I have reached is alerting about SSH bruteforce:
04/20-11:57:27.155161 [**] [1:19559:2] BAD-TRAFFIC SSH brute force login
attempt [**] [Classification: Misc activity] [Priority: 3] {TCP}
172.16.1.1:50585 -> 172.16.1.2:22

Here are the rules I used:
alert tcp $EXTERNAL_NET any -> $HOME_NET 22 (msg:"BAD-TRAFFIC SSH brute
force login attempt"; flow:to_server,established; content:"SSH-"; depth:4;
detection_filter:track by_src, count 5, seconds 60;
classtype:misc-activity; sid:19559; rev:2;)
drop tcp $EXTERNAL_NET any -> $HOME_NET 22 (msg:"BAD-TRAFFIC SSH brute
force login attempt"; flow:to_server,established; content:"SSH-"; depth:4;
detection_filter:track by_src, count 5, seconds 60;
classtype:misc-activity; sid:19559; rev:2;)

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