[Oisf-users] UDP reassambly behaviour

Michel SABORDE michel.saborde at gmail.com
Mon Jun 18 09:14:34 UTC 2012

Hi everyone,

I set up an alert on UDP to match content:"bad.html"; as i did before with
TCP and i discovered a strange behaviour that may be normal ...
I send all my datagrams from the same ip dest/ip source/port dest/port
If one datagram contains the payload "bad.html" the alert will be triggered
but if you send two datagrams in a row which contains "bad." and "html", no
alert will  be triggered because i think, correct me if i'm wrong, that
Suricata does not reassemble UDP datagrams.
I know that UDP datagrams may not be received, or may be received in a
different order but i think that it would be a nice feature anyway.
I tried Snort and it does that kind of datagrams reassambly.

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