···

       
35
       
 
       
      # Local connections should still work.

     

       
36
       
 
       
      $walled->succeed("curl -v http://localhost/ >&2");

     

       
37
       
 
       


     

       
38
       
-
       
      # Connections to the firewalled machine should fail.

     

       
39
       
 
       
      $attacker->fail("curl --fail --connect-timeout 2 http://walled/ >&2");

     

       
40
       
-
       
      $attacker->fail("ping -c 1 walled >&2");

     

       
41
       
 
       


     

       
42
       
 
       
      # Outgoing connections/pings should still work.

     

       
43
       
 
       
      $walled->succeed("curl -v http://attacker/ >&2");

     

···

       
35
       
 
       
      # Local connections should still work.

     

       
36
       
 
       
      $walled->succeed("curl -v http://localhost/ >&2");

     

       
37
       
 
       


     

       
38
       
+
       
      # Connections to the firewalled machine should fail, but ping should succeed.

     

       
39
       
 
       
      $attacker->fail("curl --fail --connect-timeout 2 http://walled/ >&2");

     

       
40
       
+
       
      $attacker->succeed("ping -c 1 walled >&2");

     

       
41
       
 
       


     

       
42
       
 
       
      # Outgoing connections/pings should still work.

     

       
43
       
 
       
      $walled->succeed("curl -v http://attacker/ >&2");