[Click] netflow

[Hongda Yin]

Hi Enrico,

The UDP/IP packets generated by NetflowExport have their UDP/IP header
all zero, while NetflowExport expect correct UDP/IP headers as well as 
annotations. 

I connect NetflowExport to "Socket" in order to have correct UDP/IP
headers, and write a UDP server to parse Netflow records.

Click user should know what kind of packet are emitted from one element
and what kind of packets are expected by the other element before gluing
the two elements together, otherwise there will be lots of weird
results, such as segment faults...

And if you can't get enough information from the manual of some element,
you can read the corresponding source codes...

Regards,
Hongda