Basic IPF Config Example Cont.
Kyle Amon,  Page 8 
/etc/ipf.rules continued

  #=============================================================================.
  # All Interfaces [*]                                                          |
  #=============================================================================+

  #-----------------------------------------------------------------------------.
  # Disallow short/fragmented packets                                           |
  #-----------------------------------------------------------------------------+

  block in log quick proto tcp all with short

  #-----------------------------------------------------------------------------.
  # Disallow source routed packets                                              |
  #-----------------------------------------------------------------------------+

  block in log quick all with opt lsrr
  block in log quick all with opt ssrr

  #-----------------------------------------------------------------------------.
  # Disallow OS fingerprinting                                                  |
  #-----------------------------------------------------------------------------+

  block in log quick proto tcp from any to any flags FUP