I have 2 interfaces:  Pub and VoIP

I need to allow port 80 into VoIP (FreePBX functions), and 80 out (yum 
updates), so I have the rules:

ACCEPT    Pub    VoIP    tcp    80
ACCEPT    VoIP    Pub    tcp    80
ACCEPT    fw    Pub    tcp    80


Seems this can be expressed in one rule:

ACCEPT    all    all-    tcp    80


Is the one rule 'faster' than the three?
Which has greater 'clarity'?



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