ZyXEL Communications ZYWALL USG 2000 Support Notes page 153

ZyWALL USG 2000 Support Notes
Step 9. You can also see more detail status of 3G network by click the icon of "celluar1."In
this figure, it shows the connection status is excellent.
850
Then the 3G wireless card will be dialed up automatically when WAN1 is not available. If you
check the "Nailed-up" option as shown in the figure above, the system will automatically dial
up the 3G Internet access even if WAN1 is available. Then you will see the process in logs as
following.
Step 10. Now, you can verify whether the backup link work well. By plugging out of WAN
link to make link failure and check the WAN status in ZyWALL USG. In the following figure,
it shows that both of WAN services are down. Only the cellular network provided by 3G is
working.
In the following figure, it presents that WAN service is working before plugging out the main
WAN link, WAN1. Then, the WAN1 link fails. There is no ICMP response and get time out.
After a while, the backup link, cellular network, take over the WAN link. Hence, ZyWALL
USG receives the ICMP responses again.
153
All contents copyright (c) 2008 ZyXEL Communications Corporation.