Digi TX54 User Manual page 360

Routing
iii. Enable Source NAT.
b. Create second firewall zone named EthernetWAN with Source NAT enabled:
i. For Add Zone, type EthernetWAN and click .
ii. Enable Source NAT.
4. Configure the WAN interfaces to use the new zones:
a. Configure the cellular WAN interface:
i. Click Network > Interfaces > WWAN1.
Note
named WWAN.
ii. For Zone, select CellularWAN.
b. Configure the Ethernet WAN interface:
i. Click Network > Interfaces > WAN1.
ii. For Zone, select EthernetWAN.
5. Configure the policy-based route for traffic from the client device that will be sent over the
cellular WAN:
a. Click Network > Routes > Policy-based routing.
b. Click the  to add a new route policy.
c. For Label, type VoIP phone.
d. For Interface, select WWAN1 (or WWAN).
e. Configure the source as the MAC address of the VoIP phone:
i. Click to expand Source address.
ii. For Type, select MAC address.
iii. For MAC address, type 26:88:0E:23:50:C2.
f. Configure the destination zone:
TX54 User Guide
On certain single-cellular TX54 devices, the cellular WAN interface may be
IP routing
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