ZyXEL Communications 128MH user manual 1 describes how to configure the Handle IPX field in Menu

Prestige 128MH PSTN Router/Hub

From Menu 3 - Ethernet Setup, enter option [4. Bridge Setup] and Menu 3.5 - Bridge Ethernet Setup displays as shown in Figure 7-1.

Menu 3.5 - Bridge Ethernet Setup

Handle IPX= None

Press ENTER to CONFIRM or ESC to CANCEL:

Press Space Bar to Toggle.

Figure 7-1. Menu 3.5 - Bridge Ethernet Setup

Table 7-1 describes how to configure the [Handle IPX] field in Menu 3.5.

Table 7-1.	Bridge Ethernet Setup Menu - Handle IPX Field Configuration
Handle IPX Field		Description
(Menu 3.5)
None		When there is no IPX traffic on the LAN or when you do not want to apply
		any special handling for IPX.
Client		When there are only client workstations on the LAN. RIP and SAP (Service
		Advertising Protocol) response packets will not trigger calls.
Server		When there are only IPX servers on the LAN. No RIP or SAP packets will
		trigger calls. In addition, during the time when the line is down, your Prestige
		will reply to watchdog messages from the servers on behalf of remote clients.
		The period of time that your Prestige will do this is linked to the [Ethernet
		Address Timeout] parameter in each remote node (see Remote Node
		Configuration). When a remote Ethernet address is aged out, there is no
		need to maintain its connection to the IPX server.

If there are both clients and servers on the LAN, and the local clients will access the remote servers, set this field to Server but turn on the Dial-On-Broadcastparameter in Menu 11.3 to allow the client queries to trigger calls.

7-2 Bridging Setup