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    Configuring IP Passthrough

    IP Passthrough allows a device connected to an Ethernet LAN port on the AirLink router to be assigned the IPv4 address of the cellular WAN interface. This bypasses the router’s Network Address Translation (NAT) layer, effectively allowing the connected device to act as if it is directly connected to the internet. All incoming traffic to the public IP is directed to the connected device.

    To configure IP Passthrough, go to Networking > General > WAN Services.

    Limitations

    • Airlink router services also use the WAN IP that is being passed through to the device receiving the passthrough IP. Therefore the passthrough device cannot use services on the same ports as the router services (LWM2M).
    • All other ports, such as HTTPS(GUI) and ping(ICMP) will be forwarded to the IP Passthrough device.
    • If you want to ping the router’s WAN IP instead of the IP Passthrough device, then set IPV4 PASSTHROUGH - ICMP GATEWAY REACHABILITY to enabled and therefore ICMP packets to the gateway will be redirected to the gateway instead of the IP Passthrough device. By default, it is disabled.
    • Any port forwarding rule on the cellular interface in passthrough mode will take priority, causing traffic to be redirected instead of sending the traffic to the IP Passthrough device.
    • User-defined Multi-WAN rules cannot use a device in IP Passthrough mode, since the IP is removed from the cellular WAN interface.
    • Only Ethernet interfaces can be enabled as passthrough interfaces.
    • If you have enabled IPv4 Passthrough, then you cannot configure IPv6 Prefix Extension. See Configuring IPv6 Prefix Extension for more information.

    Configuring IP Passthrough

    To configure IP Passthrough:

    1. Go to Networking > General > WAN Services.

    2. Click CREATE WAN SERVICE to create a new service, or at the end of a table row, click and select Edit.

    3. Configure the following fields for IP Passthrough:

    SETTING DESCRIPTION DEFAULT SETTING RANGE
    IPV4 PASSTHROUGH Enables IP Passthrough to the specified Ethernet LAN port Off Off,<list of available ethernet LAN ports>
    IPV4 PASSTHROUGH - UNSOLICITED INCOMING Allow or Deny unsolicited incoming packets to the passthrough device. Allow Allow,Deny
    IPV4 PASSTHROUGH - ICMP GATEWAY REACHABILITY Intercept ICMP packets and redirect to the router instead of fowarding to the connected passthrough device. Disabled Disabled,Enabled
    IPV4 PASSTHROUGH - NEXT HOP GATEWAY IP ASSIGNMENT By default the passthrough device will receive a next hop IP within the same subnet of the assigned WAN IP via DHCP. The next hop IP will be a.b.c.1, or a.b.c.254 if a.b.c.1 is the WAN IP. If necessary, override the next hop IP manually. Inside WAN Subnet Inside WAN Subnet,Manually Configured IP
    IPV4 PASSTHROUGH - NEXT HOP GATEWAY MANUAL IP ASSIGNMENT Only displayed when NEXT HOP GATEWAY IP ASSIGNMENT is set to Manually Configured IP. Manually set the next hop router IP via DHCP for the connected IPv4 Passthrough Device. Blank IPv4 address
    IPV4 PASSTHROUGH - DHCP OPTION SUBNET PREFIX

    Sets the subnet mask of the WAN IP. When set to Auto, for cellular devices this is 32.

    Custom Auto,Custom
    IPV4 PASSTHROUGH - PREFIX LENGTH Prefix length. Only available when DHCP OPTION SUBNET PREFIX is set to Custom 24 Prefix value
    IPV4 PASSTHROUGH - DESTINATION ALLOCATION MODE The destination IP address for the traffic First Host
    • First Host - first host to connect via DHCP
    • Select from List - neighbour list
    • Manual MAC entry

    IPV4 PASSTHROUGH - DESTINATION MAC Only displayed when DESTINATION ALLOCATION MODE is set to Select from List or Manual MAC entry. The hardware MAC address of the connecting device. blank

    IPv4 passthrough can be used in conjunction with IPv6 XLAT. See Configuring IPv6 XLAT for more information.

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