ZyXEL 793H Guida Utente

Chapter 5 WAN Setup

P-793H User’s Guide

Use this screen to edit your ZyXEL Device's advanced WAN settings. Click the Advanced 
Setup button in the More Connections Edit screen. The screen appears as shown.

Figure 31   WAN > More Connections > Advanced Setup

The following table describes the labels in this screen. 

Table 20   WAN > More Connections > Advanced Setup

RIP & Multicast 

Setup

RIP Direction

RIP (Routing Information Protocol, RFC 1058 and RFC 1389) allows a router to 

exchange routing information with other routers. The RIP Direction field controls 

the sending and receiving of RIP packets. Select the RIP direction from Both/In 

Only/Out Only/None. When set to Both or Out Only, the ZyXEL Device will 

broadcast its routing table periodically. When set to Both or In Only, it will 

incorporate the RIP information that it receives; when set to None, it will not send 

any RIP packets and will ignore any RIP packets received.

RIP Version

This field is enabled if RIP Direction is not None. The RIP Version field controls 

the format and the broadcasting method of the RIP packets that the ZyXEL Device 

sends (it recognizes both formats when receiving). RIP-1 is universally supported 

but RIP-2 carries more information. RIP-1 is probably adequate for most networks, 

unless you have an unusual network topology. Both RIP-2B and RIP-2M sends the 

routing data in RIP-2 format; the difference being that RIP-2B uses subnet 

broadcasting while RIP-2M uses multicasting. Multicasting can reduce the load on 

non-router machines since they generally do not listen to the RIP multicast address 

and so will not receive the RIP packets. However, if one router uses multicasting, 

then all routers on your network must use multicasting, also.

Multicast

IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to 

establish membership in a multicast group. The ZyXEL Device supports both IGMP 

version 1 (IGMP-v1) and IGMP-v2. Select None to disable it.

ATM QoS

ATM QoS Type

Select CBR (Constant Bit Rate) to specify fixed (always-on) bandwidth for voice or 

data traffic. Select UBR (Unspecified Bit Rate) for applications that are non-time 

sensitive, such as e-mail. Select VBR (Variable Bit Rate) for bursty traffic and 

bandwidth sharing with other applications.