[c-nsp] Two access-list questions..for Internet router

[jacob c]

My ISP gave me a 1.1.1.64/27 range. 1.1.1.65 will be the inside ethernet interface of the router.
   
  1) Does anyone see any issue with ONLY allowing 1.1.1.65 /27 range into my network since that is my only Public IP Range?
   
  2) Is it best practice (performance-wise) to put my hardened access-list which includes the statment above on the s0/2 interface for the gigabit ethernet interface?
   
  Thank you,
   

       
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