[Snort-users] letdown, dos attempt not detecting

Leonardo Pezente lmpezente at ...11827...
Tue Dec 11 12:40:59 EST 2012

its really works, thanks. here is the rule:

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"DOS syn attempt";
flags:S; flow:to_server; classtype:attempted-dos; detection_filter: track
by_src, count 1000, seconds 40; sid:1000024;)

the only think is: i cant see the msg on BASE GUI, and this is a really
interesting thing.
2012/12/11 Russ Combs <rcombs at ...1935...>

> On Tue, Dec 11, 2012 at 11:45 AM, Leonardo Pezente <lmpezente at ...11827...>wrote:
>> im testing snort attacking it with a tool called "letdown".it is a tcp
>> floder. The think is: im not able to detect what could be a potencial dos
>> attack.
>> Letdown generate like 65000 syn packets, so this should be detect fot
>> snort. I have uncomment the dos and ddos rules, but no deal. so im tring to
>> create a rule to detct this kind of traffic. Is that possible? any idea how
>> i can do that?
> Check out Snort's README.filters.  There are rate_filter examples for
> 135:1 that you can start with.
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