Specifications

VoiceFinder VoIP Gateway Configuration Guide (APOS 2.0) Release Version 3.1
AddPac Technology Co., LTD
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2.6. Configuring Filter (Access-List)
Packet Filtering is a function which enables an administrator to control the packet admission
through a network. This function is used to block an unauthorized user’s access from the outside
to the inside of network.
VoiceFinder Gateway uses Access-list as a way to control the traffic from a specific network or
equipment. The access-list can permit or deny the packet passing from one specific interface to
another.
In access-list, there is the Standard Access-list which controls traffic by source and destination
IP addresses and the Extended Access-List which uses application port number and protocol ID.
The access-list is a group of permit/deny conditions to be applied an IP address. The
VoiceFinder Gateway compares these conditions to the address field of the packet.
The first condition of the address field to be matched for the gateway is whether to accept or
reject the packet. Process order of these conditions is very important for the access-list to
operate normally, because the software may stop testing the conditions for the address after the
first match. If all the conditions are not matched, the packet is rejected for that address.
VoiceFinder supports the standard access-list(List # 1~99, 1300 ~ 1999) and Extended
Access-List(List # 100 ~ 199, 2000 ~ 2699).
Information