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M2M Cellular Gateway
Index skipping is used to reserve slots for new function insertion, when required.
5.1.3 Packet Filters
"Packet Filters" function can let you define some filtering rules for incoming and outgoing packets.
So the gateway can control what packets are allowed or blocked to pass through it. A packet filter
rule should indicate from and to which interface the packet enters and leaves the gateway, the
source and destination IP addresses, and destination service port type and port number. Lastly,
the time schedule to which the rule will be active.
In "Packet Filters" page, there are three configuration windows for packet filtering function. They
are the "Configuration" window, "Packet Filter Rule List" window, and "Packet Filter Rule
Configuration" window.
The "Configuration" window can let you activate the packet filtering function and specify to black
listing or to white listing Inbound or Outbound packets defined in the "Packet Filter Rule List"
entry. In addition, log alerting can be enabled through an "Enable" checkbox to log events. Second,
the "Packet Filter Rule List" window lists all your defined packet filtering rule entry. At last, the
"Packet Filter Rule Configuration" window can let you define one packet filtering rule.
Configuration
Check the "Enable" box to activate the "Packet Filters" function. Select either the black list or the
white list for following "Packet Filter Rule List". Finally, enable the log alerting when needed.
When you choose "Allow all to pass except those match the following rules" for the "Packet Filter
Rule List", you are setting the defined packet filtering rules to belong to the black list. The packets,
listed in the rule list, will be blocked from entering or leaving the gateway if they match to one
rule. Other packets can pass through the gateway. In contrast, when you choose "Deny all to pass
except those match the following rules" for the "Packet Filter Rule List", you are setting the
defined packet filtering rules to belong to the white list. The packets, listed in the rule, will be
allowed to enter or leave the gateway if they match to one of the rules. Other packets will be
blocked.
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