Direction of the ACL
The agreement in, out, source, and destination are acclimated as referenced by the accessory in the ambience of the breeze of the
traffic. As an analogy, cartage on the router can be compared to a commuter aerial from Sydney to San
Francisco. If the clearing administration wants to stop this commuter traveling from Sydney (source) to San
Francisco (destination), there are two possibilities for interception:
The commuter could be chock-full at the Sydney airport at the clearing ascendancy (out) departing
outbound.
The commuter could be chock-full at the San Francisco airport at the clearing ascendancy (in) arriving
inbound.
When apropos to a accessory area an ACL is applied, these agreement are authentic as follows:
Out: Cartage that has already been candy through the router and is departure the router interface (also
called departure traffic). The antecedent is area the cartage originated (on the added ancillary of the router), and the
destination is area it is activity (beyond this router).
In: Cartage that arrives on the router interface (also alleged admission traffic) and will be candy by the
router for its destination traversing through this router. The antecedent is area it has accustomed from (before
this router), and the destination is area it is activity (on the added ancillary of the router).