Options to monitor/sniff network traffic under a vm

[carlopmart]

Hi all,

  I need to monitor/sniff network traffic for three subnets (1 GiB nets) 
and I need to do this using a virtual guest under an ESXi 5 host (yes, 
it is a "handicap").

  I would like to use FreeBSD 8.4 + netmap, but I see some problems:

a) How can I avoid sharing interrupts for nics interfaces?? This vm 
needs to use 6 nic interfaces.

b) Which is best: em or ixgb emulated drivers??

c) Is it a good idea to enable polling in these nics??


Thanks.