About UDP detection

[Ryota Kurokawa <r-kurokw () ist osaka-u ac jp>]

Hi

I am using Snort 2.9.9.0.
By writing the following rules, I was successful to detect ICMP packets 
with "ping".
---
alert icmp $HOME_NET any -> $HOME_NET any (msg:"ICMP traffic"; sid:1000001;)
---
However, we could not detect UDP packets using Iperf.
What could be the cause?
The rules described are as follows.
---
alert udp $HOME_NET any -> $HOME_NET any (msg:"UDP traffic"; sid:1000002;)
---

Thanks.

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