ETIC SIG, User Manual, Page: 59 / 83

CONFIGURATION
SIG Router & VPN server User’s guide ref. 9017409-01
Page 59
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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 (drop or reject).