Advanced Settings - Ip Filter - Logic Data Systems L-5500 Manual

4. Enable NO-IP
5. Enter your NO-IP username, password and hostname for this device (do not assign
the same host name to multiple devices.)
6. Set the update interval (30 minutes is the default).
7. After registration is complete, you can login into the unit or use the port forwarding
feature by entering the hostname into a web browser followed by the port number.
(Example http://L-5500.no-ip.biz:8080)
5.7.3. Advanced Settings – IP Filter
IP Filtering provides certain Internet firewall protection. The user can enter up to 20 IP
filters. Each IP filter is identified by a unique number (from 1 to 20). When IP filtering is
enabled, any custom IP filters entered by the user as well as predefined IP filters will be
taken into account when processing IP packets.
An IP packet passes through the filtering logic when IP filtering is enabled:
1. An IP packet is received on one of the interface and is destined to the L-5500 unit, or
...
2. An IP packet is sent by the L-5500 unit, or ...
3. An IP packet is forwarded by the L-5500 unit.
5.7.3.1. Predefined IP Filters
Figure 24 – Advanced Settings -> IP Filters, Predefined IP Filters section
Drop Remote Pings: If enabled, any ICMP echo request coming from the WAN interface
will not be replied to. This prevents remote hosts from detecting your IP address on the
WAN.
Drop Remote IP Fragments: If IP filtering is enabled, any fragmented IP packets coming
from the WAN interface will be dropped.
Drop Invalid Packets: If IP filtering is enabled, any invalid IP packets received by the unit
will be silently dropped. An invalid IP packet is one that cannot be identified for some
reason.
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