IDS Evaluation

[naga raj peddisetty <nag_theindian () yahoo com>]

Hello,
    I am evaluating IDS products based on some important characterstics and challenges. In this process I have to 
evaluate Cisco, NFR, Intruder Alert,SecureNet,Netscreen IDP and Trip wire for the ZERO-DAY attack measurement.
  1)So, Could you please suggest me the what best measurements comes for Zero-day attack. 
  2). How frequent an IDS products must be updated inorder to protect against zero-day attacks?
  3) what are the other measures to look for in products for protection against zero-day attacks?.
  4) Do any of you have evalauated any of the above products? Any URLs? Can you please send them!!

Thanks in advance for your help.

Nag Raj Peddisetty,
Sweden.

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