Figure 100 Network > Wan > 3G (Wan 2) - ZyXEL Communications ZYWALL 35 User Manual

Chapter 8 WAN Screens
Turn the ZyWALL off before you install or remove the 3G card.
The WAN 1 and WAN 2 IP addresses of a ZyWALL with multiple WAN
interfaces must be on different subnets.
Figure 100 NETWORK > WAN > 3G (WAN 2)
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ZyWALL 5/35/70 Series User's Guide