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ENHANCED IP STACK AT COMMANDS

AT Commands for EV-DO-EV3 Modems

148

Parameters and Values

<n> Enable or disable RI.

0 RI disabled for Socket Listen connect. Default: 0.

50-1150 RI enabled for Socket Listen connect; a negative going pulse is generated on receipt

of connect and <n> is the duration in ms of this pulse.

Firewall Setup #FRWL

Execute command controls the internal firewall settings.

Read command reports the list of all ACCEPT chain rules registered in the Firewall settings in the format:

#FRWL: <ip_addr>,<net_mask>

….

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

Syntax

Command Command type

AT#FRWL=[<action>,<ip_address>,<net mask>] Execute

AT#FRWL? Read

AT#FRWL=? Test

Parameters and Values

<action> Command action.

0 Remove selected chain.

1 Add an ACCEPT chain.

2 Remove all chains (DROP everything); <ip_addr> and <net_mask> have no meaning

in this case.

<ip_addr> String type, remote address to be added into the ACCEPT chain. Can be any valid IP

address in the format: xxx.xxx.xxx.xxx.

<net_mask> String type, mask to be applied on the <ip_addr>. 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 is silently discarded.

When a packet comes from the IP address incoming_IP, the firewall chain rules are

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.

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Multitech CDMA Betriebsanweisung Seite 148