Netopia Router PN Series Manual de usuario descargar pdf (Pagina 161)

Security 7-19

Input and output ﬁlters—source and destination

There are two kinds of ﬁlters you can add to a ﬁlter set: input and

output. Input ﬁlters check packets received from the Internet,

destined for your network. Output ﬁlters check packets transmitted

from your network to the Internet.

Packets in the Netopia Router pass through an input ﬁlter if they originate in the

WAN and through an output ﬁlter if they’re being sent out to the WAN.

The process for adding input and output ﬁlters is exactly the same.

The main difference between the two involves their reference to

source and destination. From the perspective of an input ﬁlter, your

local network is the destination of the packets it checks, and the

remote network is their source. From the perspective of an output

ﬁlter, your local network is the source of the packets, and the remote

network is their destination.

The Netopia Router

input ﬁlter

output ﬁlter

LAN

WAN

packet

Type of ﬁlter “source” means “destination” means

Input ﬁlter the remote network the local network

Output ﬁlter the local network the remote network

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Netopia Router PN Series Manual de usuario Pagina 161