Rainbow-electronics GM862-QUAD-PY Manual de usuario descargar pdf (Pagina 359)

AT Commands Reference Guide

80000ST10025a Rev. 5 - 09/07/08

#FRWL - Firewall Setup SELINT 0 / 1

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.

Note: If all parameters are omitted the command reports the list of all

ACCEPT chain rules registered in the Firewall settings in the format:

#FRWL: <ip_addr>,<net_mask>

….

AT#FRWL?

Read command has the same effect as Execution command when

parameters are omitted.

AT#FRWL=?

Test command returns the allowed values for parameter <action>.

Example

Let assume we wan

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"

Note For outgoing connections made with #SKTOP and #SKTD the remote host

is dynamically inserted into the ACCEPT chain for all the connection

duration. Therefore the #FRWL command shall be used only for defining

either the #SKTL or the @SKTL behaviour, deciding which hosts are

allowed to connect to the local device.

Rules are not saved in NVM, at startup the rules list will be empty.

#FRWL - Firewall Setup SELINT 2

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>

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Rainbow-electronics GM862-QUAD-PY Manual de usuario Pagina 359

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