[Oisf-users] about alerts and pcap-log

Cooper F. Nelson cnelson at ucsd.edu
Thu Jul 18 02:39:59 UTC 2019

The tcp alerts will only alert once per flow.  So it will alert on the
first two packets of the three-way handshake, but not the third as the
flow has then been established and already alerted on.

Can't answer your second question.

Re: pcap-log, that is as expected as its the packets processed by
suricata.  If you want the frames off the wire, use wireshark. 


On 7/17/2019 7:32 PM, fyshine at sina.cn wrote:
> I test some rules by the suricata, i find it's strange;
> My english is a little poor, please forgive me
> rule       alert tcp any any -> any any ( msg:"test1", sid:100001; )
> should not alert every packet in this tcp flow, but the result is just
> two alerts   one is syn , other is syn ack, i am not find the reson
> capture        i use nfq to capture packet;   suricata  runmode inline
> nfqueue;
> the packets counts and bytes in the two place is very different,  i
> understand tcp overlap, but why the bytes is different
> pcap-log      i observe the flow use wireshark,there is no ethernet
> information ,just raw packet data, why is this 
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Cooper Nelson
Network Security Analyst
UCSD ITS Security Team
cnelson at ucsd.edu x41042

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