RLXIC-EH
♦
Intelligent Cellular
Data Communication and Host Modes
RadioLinx Intelligent Cellular Ethernet Gateway for HSUPA (3G GSM) Networks
User Manual
Page 58 of 111
ProSoft Technology, Inc.
May 29, 2009
IP Filtering
: When enabled, only packets with source IP addresses matching
those in a list or range of trusted hosts will be allowed through.
o
Friends List IP: Each entry can be configured to allow a single IP address,
for example 64.100.100.2, or the IP addresses from a complete subnet,
such as 64.100.10.255 allowing all IP addresses from 64.100.10.0 to
64.100.10.255.
o
Non-Friends Port Forwarding: Non-Friends port forwarding is like an allow
rule for any of the forwarded ports. If it is enabled, the port forwarding
rules apply to all incoming packets. If it is disabled, only Friends List IPs
get through.
o
Start and End Range: Specify the IP address range that is allowed
access, for example 64.100.10.2 to start and 64.100.10.15 to end would
allow 64.100.10.5 but would not allow 64.100.10.16.
Note:
Port Filtering Mode does not require to be set when you enable Non-Friends Port
Forwarding.
Port Filtering Mode:
Independent of the IP filtering, this mode can be
enabled to block ports specified or allow ports specified. When enabled, all
ports not matching the rule will be allowed or blocked depending on the
mode.
Firewall Port:
Specify the port you wish to have blocked or allowed,
depending on the mode configured.
Packet Filtering:
Not available at this time.
7.5 Keepalive
Keepalive is used to test the connection to the cellular network by pinging an IP
address after a specified period of inactivity. Keepalive is only recommended for
users who have a remote terminated modem that infrequently communicates to
the network or if you have experienced issues over time where the modem can
no longer be reached remotely.
When Keepalive pings the IP address, an acknowledgement indicates there is an
active connection to the network. If the RLXIC-EH does not receive a response
from the IP address, it will make additional attempts according to a backoff
algorithm before determining the Internet connection is not functioning properly. If
it determines the connection is not functioning, the modem will then attempt to
reconnect to your cellular provider to reestablish IP connectivity.
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