Zhone 1740 shdsl 用户指南

6.1 

Add a Packet Filter entry 

To add a Packet Filter, complete the following steps:  

STEP 1: Enter values for the parameters (explained below). 

STEP 2: Click on the Add button. 

STEP 3: Click on the Apply button at the bottom of the page. 

Priority 

You can enter a number here to assign the priority of a filter, in 
case there are overlapping rules. The lower the number the higher 
its priority. 

Protocol 

Select from TCP/UDP/ICMP/IP. 

Source IP 

Source IP of a packet you wish to filter. 

Source Mask  

Source Mask of a packet. 

Source Port 

Source Port of a packet you wish to filter. 

Destination IP 

Destination IP of a packet you wish to filter. 

Destination Mask 

Destination Mask of a packet. 

Destination Port 

Destination Port of a packet you wish to filter. 

TCP Flag 
([F.S.R.P.A.U] 

This field allows you to filter according to a TCP flag. 

Action  

This field determines the action the router will take when it receives 
a packet that corresponds to a filtering rule. It can be set to: 

allow, to let the packet pass through the filter. 

deny, to drop the packet. 

count, which has no effect on whether the packet will be allowed 
through the filter, causes the packet to be included in the 
accounting statistics kept by the filter.  

Interface 

You can choose to apply this setting to a specific LAN or ATM 
interface. This function is called Packet Binding.  

Packet Binding is a function that can be used when we have 
multiple Virtual Channels (VC) and we are utilizing IP Packet 
Filtering. In some cases, we may not wish to apply the packet 
filtering to all VCs. In this case, we can bind IP packet filtering to a 
VC. This means that filtering will only be applied to the bound VC, 
and thus the remaining VCs will not filter packets. 

Direction 

This field determines whether the rule applies to Inbound, 
outbound or both directions 

1740-A2-GB20-20                                                         May 2005      

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