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      1 #
      2 # For a network server, which has two interfaces, 128.1.40.1 (le0) and
      3 # 128.1.2.1 (le1), we want to block all IP spoofing attacks.  le1 is
      4 # connected to the majority of the network, whilst le0 is connected to a
      5 # leaf subnet.  We're not concerned about filtering individual services
      6 # or
      7 #
      8 pass in quick on le0 from 128.1.40.0/24 to any
      9 block in log quick on le0 from any to any
     10 block in log quick on le1 from 128.1.1.0/24 to any
     11 pass in quick on le1 from any to any
     12