Chapter 8 WAN Screens

Table 36 NETWORK > WAN > Dial Backup (continued)

LABEL

DESCRIPTION

Enable Multicast

Select this check box to turn on IGMP (Internet Group Multicast Protocol). IGMP

 

is a network-layer protocol used to establish membership in a Multicast group - it

 

is not used to carry user data.

 

 

Multicast Version

Select IGMP-v1or IGMP-v2. IGMP version 2 (RFC 2236) is an improvement

 

over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If you would

 

like to read more detailed information about interoperability between IGMP

 

version 2 and version 1, please see sections 4 and 5 of RFC 2236.

 

 

Budget

 

 

 

Always On

Select this check box to have the dial backup connection on all of the time.

 

 

Configure Budget

Select this check box to have the dial backup connection on during the time that

 

you select.

 

 

Allocated Budget

Type the amount of time (in minutes) that the dial backup connection can be

 

used during the time configured in the Period field. Set an amount that is less

 

than the time period configured in the Period field.

 

 

Period

Type the time period (in hours) for how often the budget should be reset. For

 

example, to allow calls to this remote node for a maximum of 10 minutes every

 

hour, set the Allocated Budget to 10 (minutes) and the Period to 1 (hour).

 

 

Idle Timeout

Type the number of seconds of idle time (when there is no traffic from the

 

ZyWALL to the remote node) for the ZyWALL to wait before it automatically

 

disconnects the dial backup connection. This option applies only when the

 

ZyWALL initiates the call. The dial backup connection never times out if you set

 

this field to "0" (it is the same as selecting Always On).

 

 

Apply

Click Apply to save your changes back to the ZyWALL.

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

8.11 Advanced Modem Setup

8.11.1 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.

For ISDN lines, there are many more protocols and operational modes. Please consult the documentation of your TA. You may need additional commands in both Dial and Init strings.

8.11.2 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.

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ZyWALL 2 Plus User’s Guide