[Bro] Bro Alarms

Diogo Corteletti de Oliveira diogo_c at brturbo.com.br
Mon Nov 12 10:02:02 PST 2007

Hello Guys,

                        One more question. After enabling the DPD and 
filtering it to only consider events on port 80 I am getting a lot of 
alarms for Google connections like the one bellow:

t=1194889271.174088 no=ProtocolViolation na=NOTICE_ALARM_ALWAYS 
sa=x.x.x.x sp=4421/tcp da= dp=80/tcp msg=x.x.x.x/4421\ >\\ analyzer\ HTTP\ disabled\ due\ to\ protocol\ 
violation sub=not\ a\ http\ reply\ line tag=@877

                         I am assuming that this is an alert that could 
inform that someone is using a different protocol (not-http) on port 80. 
My objective (as stated in a previous e-mail) is to detect such a thing. 
The strange thing is that I tried to do this before with SourceFire's 
RNA and it alerted with google connections also. Could this mean that 
Google does not follow the HTTP RFC? Any suggestions?


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