USRobotics NETServer/16 Manuel d'utilisateur télécharger pdf (Page 116)

8-2 Packet Filters

Types of Filters

The NETServer supports the following types of packet filters:

• Input and output filters; packet filters can be created to

control either inbound or outbound data packets

• Source and destination address filtering; a packet filter can

permit or deny access based on the IP address of the source

and/or destination

• Protocol filtering; inbound or outbound network traffic can

be evaluated based on the protocol

• Source and destination port filtering; a packet filter can

control what services local or remote users can access

• Established session filtering; a packet filter can permit users

to connect with a remote network without letting remote

users have access to the local network (or vice versa)

Packet Filters and the NETServer

Once created, a packet filter can be designated for use in any of

the following applications:

• Filter packets exchanged with the local network (Input Filter

and Output Filter fields of LAN Port Configuration)

• Control which hosts all login users can access (Input Filter

field of Port Parameters window for user login ports);

• Control which hosts a specific login user can access (Access

Filter field of the Login User Parameters window)

• Filter packets passing through a hardwired connection

(Input Filter and Output Filter fields of the Port Parameters

window for hardwired ports)

• Filter packets exchanged with a specific network user (Input

and Output Filter fields of Network User Configuration)

• Filter packets exchanged with a specific location (Input

Filter and Output Filter fields of the Location Table)

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USRobotics NETServer/16 Manuel d'utilisateur Page 116