IPL ROUTER SET-UP
Page 66
Setup Guide 9023409-01
Ethernet ADSL Cellular Routeur Firewall
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Main filter table
The main filter is a table, each line being a rule.
Each rule of the filter is composed a several fields which defines a particular data flow and another field
which is called the action field.
The fields which define the data flow are :
Direction (« WAN to LAN » or « LAN to WAN »),
Protocol (TCP, UDP…),
IP@ & port number, source & destination.
The Action field can take two values
Accept : To authorize the data flow to be forwarded to the router interface.
Drop : To drop the packet which matches the rule.
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How does the main filters works
When the firewall receives a packet, it checks if it matches the first rule.
If it does, the decision is applied to the packet according to the “Action” field.
If it does not, the firewall checks if it matches the second rule; and so on.
If the packet does not match any of the rules of the table, the default policy is applied to the packet (Allow or
Deny).
Remark :
Coming from factory, the main filter is set-up as follows :
The traffic carried inside the VPNs is authorized.
The traffic carried outside the VPNs is authorized when it is initiated by a device belonging to the LAN
network.
The traffic carried outside the VPNs is denied when it is initiated by a device belonging to the WAN network.
