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| Chapter 7 WAN Setup |
| Table 37 More Connections Advanced Setup (continued) | |
| LABEL | DESCRIPTION |
| Sustain Cell Rate | The Sustain Cell Rate (SCR) sets the average cell rate |
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| transmitted. Type the SCR, which must be less than the PCR. Note that system |
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| default is 0 cells/sec. |
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| Maximum Burst | Maximum Burst Size (MBS) refers to the maximum number of cells that can be |
| Size | sent at the peak rate. Type the MBS, which is less than 65535. |
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| MTU |
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| MTU | The Maximum Transmission Unit (MTU) defines the size of the largest packet |
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| allowed on an interface or connection. Enter the MTU in this field. |
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| For ENET ENCAP, the MTU value is 1500. |
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| For PPPoE, the MTU value is 1492. |
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| For PPPoA and RFC 1483, the MTU is 65535. |
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| Back | Click Back to return to the previous screen. |
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| Apply | Click Apply to save the changes. |
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| Cancel | Click Cancel to begin configuring this screen afresh. |
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7.7 Traffic Redirect
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).
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