ZyXEL Communications ZYWALL USG CLI - AT Command Strings; Response Strings; Dial-In Management; Dial-In Management Commands; ICMP Filter

Chapter 34 System Remote Management
ZyWALL (ZLD) CLI Reference Guide
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34.9 ICMP Filter
The ip icmp-filter commands are obsolete. See Chapter 14 on page 111 to configure
firewall rules for ICMP traffic going to the ZyWALL to discard or reject ICMP packets
destined for the ZyWALL.
34.10 Dial-in Management
Connect an external serial modem to the DIAL BACKUP port (or AUX port depending on
your model) to provide a remote management connection in case the ZyWALL’s other WAN
connections are down. This is like an auxiliary interface, except it is used for management
connections coming into the ZyWALL instead of as a backup WAN connection.
34.10.1 AT Command Strings
For regular telephone lines, the default Dial string tells the modem that the line uses tone
dialing. ATDT is the command for a switch that requires tone dialing. If your switch requires
pulse dialing, change the string to ATDP.
34.10.2 DTR Signal
The majority of WAN devices default to hanging up the current call when the DTR (Data
Terminal Ready) signal is dropped by the DTE. When the Drop DTR When Hang Up check
box is selected, the ZyWALL uses this hardware signal to force the WAN device to hang up, in
addition to issuing the drop command ATH.
34.10.3 Response Strings
The response strings tell the ZyWALL the tags, or labels, immediately preceding the various
call parameters sent from the serial modem. The response strings have not been standardized;
please consult the documentation of your serial modem to find the correct tags.
34.10.4 Dial-in Management Commands
The following table describes the commands available for dial-in management. You must use
the
configure terminal command to enter the configuration mode before you can use
these commands.
Table 159 Command Summary: Dial-in Management
COMMAND DESCRIPTION
dial-in Enters sub-command mode.
[no] activate Turns dial-in management on. The
no command turns it
off.
[no] answer-rings Sets how many times the ZyWALL lets the incoming dial-
in management session ring before processing it. The
no command sets it to one.