ZyXEL Communications P-6600HW-Tx v3 User Manual

 Chapter 7 WAN Setup

P-660HW-Tx v3 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 72   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). 

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

MTU

The Maximum Transmission Unit (MTU) defines the size of the largest packet 

allowed on an interface or connection. Enter the MTU in this field.
For ENET ENCAP, the MTU value is 1500.
For PPPoE, the MTU value is 1492.
For PPPoA and RFC 1483, the MTU is 65535.

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 37   More Connections Advanced Setup (continued)