CalAmp Fusion User Manual - page 65
Fusion Multi-Network LTE Router PN 001-0000-602 Rev. B
| Page 59
The IP Filtering tab is used to configure IP filters.
Up to 20 IP filters can be defined. Each IP filter is identified by a unique number (from 1 to 20).
An IP packet goes through the filtering logic when IP filtering is enabled and:
1) The IP packet is received on one of the interface and is destined to the Fusion
OR
2) The IP packet is sent by the Fusion
OR
3) The IP packet is forwarded by the Fusion.
The filtering logic is the following:
if exists(filter[1]) AND match(packet, filter[1]) then apply(action[1])
else if exists(filter[2]) AND match(packet, filter[2]) then apply(action[2])
else if exists(filter[3]) AND match(packet, filter[3]) then apply(action[3])
. . .
else if exists(filter[20]) AND match(packet, filter[20]) then apply(action[20])
else process packet normally.
Where:
exists(filter[n]) -> The user-defined filter number n.
match(packet, filter[n]) -> The IP packet matches filter number n.
apply(action[n]) -> The action identified in filter number n.
IP Filters
IP Filtering
Enable: IP filtering is enabled. Any custom IP filters entered by the user will be taken into account when processing
IP packets. The predefined IP filters will also be taken into account.
Disable: IP filtering is disabled.
Predefined Filters
Drop Remote Pings
Set this to Disabled if you do not want the Fusion to respond to pings from the WAN. This can reduce your data
usage and improve security, but will make connectivity testing more difficult.
Drop remote IP Fragments
In some cases large packets sent by a remote IP endpoint will be broken and sent as fragments via the Fusion to a
local endpoint. Enable this if you want to drop those packets. In most cases this should be left disabled to ensure
reliable end-to-end communication.
Drop Invalid Packets
Select Enabled to have the Fusion drop any incoming packets that have been determined to be invalid.
Clamp TCP MSS to PMTU
Select Enabled to set the TCP Maximum Segment Size (MSS) to a good value based on the Path Maximum
Transmission Unit (PMTU).