DE910-DUAL AT commands reference guide
80392ST10102A Rev.2 – 2012-07-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 193 of 261
#E2SLRI - Socket Listen Ring Indicator
AT#E2SLRI=?
Test command returns the allowed values for parameter
<status>.
#FRWL - Firewall Setup
AT#FRWL=
[<action>,
<ip_address>,
<net mask>]
Execution command controls the internal firewall settings.
Parameters:
<action>
- command action
0 - remove selected chain
1 - add an
ACCEPT
chain
2 - remove all chains (
DROP
everything);
<ip_addr>
and
<net_mask>
has no
meaning in this case.
<ip_addr>
- remote address to be added into the
ACCEPT
chain; string type, it
can be any valid IP address in the format: xxx.xxx.xxx.xxx
<net_mask>
- mask to be applied on the
<ip_addr>
; string type, it can be any valid
IP address mask in the format: xxx.xxx.xxx.xxx
Command returns
OK
result code if successful.
Note: the firewall applies for incoming (listening) connections only.
Firewall general policy is
DROP
, therefore all packets that are not included into an
ACCEPT
chain rule will be silently discarded.
When a packet comes from the IP address
incoming_IP
, the firewall chain rules
will be scanned for matching with the following criteria:
incoming_IP & <net_mask> = <ip_addr> & <net_mask>
If criteria is matched, then the packet is accepted and the rule scan is finished; if
criteria is not matched for any chain the packet is silently dropped.
AT#FRWL?
Read command reports the list of all
ACCEPT
chain rules registered in the
Firewall settings in the format:
#FRWL: <ip_addr>,<net_mask>
#FRWL: <ip_addr>,<net_mask>
….
OK
AT#FRWL=?
Test command returns the allowed values for parameter
<action>.
Example
Let assume we want to accept connections only from our devices which are on the
IP addresses ranging from
197.158.1.1 to 197.158.255.255
We need to add the following chain to the firewall:
AT#FRWL=1,"197.158.1.1","255.255.0.0"
Содержание DE910-DUAL
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