ZyXEL 793H Betriebsanweisung

 Chapter 5 WAN Setup

P-793H User’s Guide

Traffic redirect forwards traffic to a backup gateway when the ZyXEL Device cannot connect 
to the Internet. An example is shown in the figure below.

Figure 32   Traffic Redirect Example

The following network topology allows you to avoid triangle route security issues when the 
backup gateway is connected to the LAN. Use IP alias to configure the LAN into two or three 
logical networks with the ZyXEL Device itself as the gateway for each LAN network. Put the 
protected LAN in one subnet (Subnet 1 in the following figure) and the backup gateway in 
another subnet (Subnet 2). Configure filters that allow packets from the protected LAN 
(Subnet 1) to the backup gateway (Subnet 2). 

Peak Cell Rate

Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell 

Rate (PCR). This is the maximum rate at which the sender can send cells. Type the 

PCR here.

Sustain Cell Rate The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that can be 

transmitted. Type the SCR, which must be less than the PCR. Note that system 

default is 0 cells/sec. 

Maximum Burst 

Size

Maximum Burst Size (MBS) refers to the maximum number of cells that can be 

sent at the peak rate. Type the MBS, which is less than 65535. 

MTU

Maximum Transmission Unit. Type the maximum size of each data packet, in 

bytes, that can move through this interface. If a larger packet arrives, the ZyXEL 

Device divides it into smaller fragments. Allowed values are 512 - 1500. Usually, 

this value is 1500.

Back

Click Back to return to the previous screen.

Apply

Click Apply to save the changes. 

Cancel

Click Cancel to begin configuring this screen afresh.

Table 20   WAN > More Connections > Advanced Setup (continued)