LCTN0011: WAN Fail-Over & Traffic Redirect This TechNote applies to LAN-Cell models: LAN-Cell 2: LC2-411 (firmware 4.02 or later) CDMA: 1xMG-401 1xMG-401S GSM: GPRS-401 Minimum LAN-Cell Firmware Revision: 3.62(XF2). Note for Original LAN-Cell Model (1xMG & GPRS) Users: The WAN Fail-Over & Traffic Redirect screens in the original LAN-Cell’s Web GUI differ slightly from the examples in this Technote.
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LCTN0011: WAN Fail-Over & Traffic Redirect Introduction The LAN-Cell offers 2 distinctly different mechanisms for ensuring that WAN-bound traffic is routed to an available WAN gateway. WAN Fail-Over WAN Fail-Over is the LAN-Cell’s method of monitoring its internal WAN interfaces (Ethernet wired WAN port, Cellular 3G modem WAN port, and Dial-Backup serial port) and sending packets to the highest priority interface that is operational.
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LCTN0011: WAN Fail-Over & Traffic Redirect Example 1: WAN Fail-Over You can assign a relative routing priority to each of the LAN-Cell’s WAN interfaces (wired Ethernet, Cellular, Traffic Redirect and Dial-Backup). The LAN-Cell uses these values to determine the interface to which packets are routed.
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LCTN0011: WAN Fail-Over & Traffic Redirect LAN-Cell Configuration First, configure the WAN, Cellular and Dial-Backup interfaces for your specific equipment and connection type. In our example, the DSL modem has a static IP address of 23.4.147.160 / 255.255.240.0 with a default remote gateway of 24.3.144.1 (Figure 2).
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LCTN0011: WAN Fail-Over & Traffic Redirect The Dial-Up modem needs its PPP username, password and ISP telephone number entered along with a modem initialization command string (Figure 4). Figure 4: Dial-Backup Parameters Page 5...
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LCTN0011: WAN Fail-Over & Traffic Redirect Next, select the NETWORK->WAN menu, then the General tab (Figure 5). Figure 5: Configuring WAN Fail-Over Ensure that the Operation Mode is set to Active/Passive. Select Fall Back to Primary WAN When Possible if you want to use the secondary WAN interfaces only when necessary.
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LCTN0011: WAN Fail-Over & Traffic Redirect Testing WAN Fail-Over The easiest way to test if WAN Fail-Over is working is to remove one or more of the WAN interfaces. In our example, removing the cable from the LAN-Cell’s WAN port to the DSL modem will force the wired WAN interface to go down and the Cellular interface to become active.
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LCTN0011: WAN Fail-Over & Traffic Redirect Example 2: Traffic Redirect The LAN-Cell also supports a “virtual” WAN interface called Traffic Redirect. You can indicate the IP address of backup gateway (a device that has its own pathway to the WAN) to which the LAN-Cell will forward all packets whenever the LAN-Cell has no primary or secondary direct WAN connection.
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LCTN0011: WAN Fail-Over & Traffic Redirect LAN-Cell Configuration Configure the primary LAN-Cell for its normal WAN/Cellular operation. Configure the backup gateway for its normal operation and WAN connectivity Notice that in the example shown in Figure 7, the LAN-Cell and the backup gateway are on different logical IP subnets on the same physical network (LAN-Cell = 192.168.1.1 and backup gateway = 192.168.0.1).
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LCTN0011: WAN Fail-Over & Traffic Redirect Figure 10: WAN Continuity Check for Traffic Redirect Testing Traffic Redirect You can easily test the Traffic Redirect feature by removing the LAN-Cell’s WAN cable (if used) or by changing the Cellular 3G card’s configuration such that it cannot make a connection (e.g. change the ISP Access Phone number on the WIRELESS->CELLULAR screen).
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LCTN0011: WAN Fail-Over & Traffic Redirect screen and enter the IP address of a DNS server on the backup gateway’s subnet (Figures 11-13). In many cases, the backup gateway’s IP address can be used -- it will relay the DNS request to the appropriate server. Figure 11: Insert DNS Server Figure 12: DNS Server on Backup Gateway Network Figure 13: DNS Server on Backup Gateway Network...
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