I understand that you can go from a higher security interface to a lower security interface without configuring acls. The ASDM shows that there is an implicit rule allowing this. My question is - once I configure an access rule on the ASDM, that line disappears. Does that mean that I no longer have an implicit rule allowing me to go from a higher security interface to a lower security interface. I am entering a rule to allow a DMZ interface (level 50) to reach some internal servers on the inside (level 100). Once I configure this rule, have I now cutoff access to the level 0 interface?