AddPac AP2520 VoIP Guia do Utilizador descarregar pdf (Página 106)

PassFinder AP2520 VoIP Router/Gateway Operation Manual Version 1.10 / Mar. 2002

AddPac Technology Co., Ltd. -

106 -

4.7. Filter (Access-List) Configuration

Packet filtering enables the manager to control packet movement on the

network. With the packet filtering function, the manager can prevent

unqualified user’s access to the inside network from outside and disclosure of

information.

The PassFinder AP2520 Gateway uses the access-list to control traffic from a

certain user (or an equipment or a network) to a certain network (or an

equipment.) In this way, the Gateway can permit or deny packets passing

through certain interfaces.

There are two kinds of access-list – the standard access-list and the extended

access-list. The standard access-list uses IP addresses of the source and the

destination in controlling traffic. And the extended access-list uses application

port numbers and protocol IDs as well as IP addresses of the source and the

destination in controlling traffic. The access-list is a continuous set of

permit/deny conditions that are applied to the IP address. Software of the

PassFinderAP2520 Gateway checks theses conditions with each address field of

the packet.

With the first condition that matches with the address field, the Gateway

decides to accept or reject the packet. After first matching, software stops

testing the address. Therefore, orders of conditions are very important to

normally operating the access-list. If there is no matching condition, software

rejects the corresponding packet. (Default)

The PassFinderAP2520 Gateway supports 30 standard access-lists (List # 0~29)

and 30 extended access-list(List # 30 ~ 59.)

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