Thanks for the response.
Of course security at the application layer is important but if you can stop nastyness from getting there before it taxes the end servers less so they can do what they should be doing.... though I guess it's a bit of a tangent on the "chicken and egg" concpet???
I think I just felt like being invisible was the best way forward. My IDS is screaming at me for portscans though it might just be better to turn off those rules?
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