Wireless WAN (WWAN)¶

Wireless WAN (WWAN), also referred to as a mobile or cellular interface, provides WAN backhaul connectivity over 4G LTE and 5G NR cellular networks. On RansNet branch-series devices, WWAN is the primary or secondary WAN link, enabling internet and SD-WAN connectivity without a fixed-line broadband connection.

Each WWAN interface corresponds to a physical cellular modem module installed in the device. The modem establishes a data session (PDN connection) with the mobile network using a SIM card and the configured APN, and presents the resulting IP address to the device as a routable WAN interface.

Warning

Before proceeding, ensure the SIM card is fully seated and all antenna connectors are tightly screwed on. Loose antennas and improperly inserted SIMs are the most common reasons a WWAN interface fails to come online.

Navigate to Device Settings → Network → WWAN.

Single vs Dual Modem¶

RansNet branch devices support single-module and dual-module configurations:

Configuration	Devices	Behaviour
Single module (wwan0 only)	XE-300R, HSA-520R, UA-520R, UA-800NR	One active modem. Dual physical SIM slots supported — SIMs operate in active/standby mode. The standby SIM takes over automatically on primary SIM failure.
Dual module (wwan0 + wwan1)	HSA-520L2, UA-800NR2	Two independent modem modules, each with its own SIM. Both run simultaneously in active/active mode, providing two independent cellular uplinks for load balancing or redundancy via Multi-WAN.

WWAN Connection Options¶

At the top of the WWAN tab, select the connection mode that matches your SIM plan:

Option	Description
Single Connection per SIM	One PDN (Packet Data Network) session per SIM card. Standard for most SIM plans.
Multiple Connections per SIM (Multi-PDN)	Multiple simultaneous PDN sessions on a single SIM, each with a different APN. Used when a SIM plan provides separate APNs for internet and private network access (e.g., corporate intranet over a private APN alongside public internet).

WWAN Interfaces¶

The WWAN Interfaces table lists all modem interfaces on the device:

Column	Description
Name	Interface identifier — `wwan0` (primary modem) or `wwan1` (secondary modem on dual-module devices)
Enable	Toggle to administratively enable or disable the modem interface
APN	Configured Access Point Name for this interface
5G/NR Setting	Active 5G mode configuration (NSA or SA, and radio access mode)
Band Lock	Frequency bands the modem is locked to, if configured
Action	Edit or reset the interface configuration

Click the edit (yellow) button on the right side of an interface row to open its configuration form.

Interface Configuration¶

Basic Settings¶

Field	Description
Name	Interface name (`wwan0` or `wwan1`) — read-only
Admin Status	Enable or disable this modem interface

5G/NR Settings¶

These settings control how the modem connects to 5G networks. They are only relevant for 5G-capable modems.

5G/NR Disable — Select which 5G sub-architecture to disable if needed:

Option	Description
NSA	Disable 5G Non-Standalone mode. NSA uses a 5G NR radio but anchors control signalling to an existing 4G LTE core. Disabling NSA forces the modem to use SA or fall back to LTE.
SA	Disable 5G Standalone mode. SA uses both a 5G NR radio and a full 5G core network. Disabling SA forces the modem to use NSA or LTE.

5G/NR Mode — Select the radio access technology the modem is permitted to use:

Mode	Description
AUTO	Let the modem select the best available technology automatically (recommended)
LTE	Lock to 4G LTE only — disables 5G even if available
NR5G	Lock to 5G NR only — the modem will not fall back to LTE
LTE_NR5G	Allow both LTE and 5G NR — modem selects based on signal quality

Optional Settings¶

Click each option to expand and configure it:

Option	Description
APN	Access Point Name provided by the mobile carrier. Required for establishing the data session. Leave blank if the carrier provisions it automatically via SIM.
Band Lock	Lock the modem to specific frequency bands (e.g., B3, B7, B28 for LTE; n78 for 5G). Useful for optimising signal in areas with known strong bands or avoiding congested bands. Leave blank to allow auto band selection.
DynDNS	Enable Dynamic DNS updates for the WWAN interface IP
Route Metric	Administrative metric for the default route via this interface. Used to set WWAN as primary or secondary WAN when multiple uplinks are present — lower metric = higher priority.
Enable Tracking	Enable interface tracking to monitor the WWAN link health and trigger failover
Ignore Default Route	Do not install the carrier-assigned default route into the routing table. Useful when WWAN is used only for a specific VPN or SD-WAN tunnel, not as a general internet gateway.
MTU	Override the interface MTU (default: `1500`). Reduce to avoid fragmentation on tunneled connections (e.g., `1420` for IPsec over WWAN).
Netflow Export	Enable NetFlow traffic export on this interface for flow-based monitoring

CLI Configuration¶

Set APN manually¶

interface wwan0
  apn internet
  enable

Set 5G mode¶

interface wwan0
  nr-mode NR5G
  enable

Band Lock¶

interface wwan0
  nr-band sa 78
  enable

View status¶

show interface wwan0
================================================================================
  Interface : wwan0
================================================================================

  Network Information
  ----------------------------------------
  Admin State            : UP
  Link State             : UP
  MTU                    : 1280 bytes
  IPv4 Address           : 100.67.24.147/0
  IPv4 Broadcast         : 100.67.24.147
  IPv4 Address           : 100.67.24.147/29
  IPv4 Broadcast         : 100.67.24.151

  Mobile Connection
  ----------------------------------------
  Modem IMEI             : 869814061357111
  Modem Rev              : 89611.1000.00.04.01.18
  SIM IMSI               : 525016143247531
  SIM ICCID              : 8965012501070124895F
  SIM Slot               : Secondary (SIM2)
  SIM State              : Connected
  SIM APN                : 
  Provider               : Zero1
  Network                : LTE (mode=AUTO, band=auto)
  Cell ID                : 
  RSSI                   : -67 dBm (excellent)
  RSRP                   : -99 dBm (fair)
  SINR                   : N/A
  RSRQ                   : -14 dB (fair)

  Physical Information
  ----------------------------------------
  Link Detected          : yes

================================================================================

Output Field Descriptions¶

Network Information¶

Field	Description
Admin State	Administrative status of the interface (`UP` = enabled, `DOWN` = disabled). Set via configuration; does not reflect actual connectivity.
Link State	Actual operational state of the interface (`UP` = connected and registered with cellular network, `DOWN` = no signal or disconnected).
MTU	Maximum Transmission Unit in bytes. Default is `1500`; may be reduced by the carrier.
IPv4 Address	IP address(es) assigned by the carrier's PDN. Multiple entries indicate multiple simultaneous PDN sessions (Multi-PDN). Format is `address/prefix-length`.
IPv4 Broadcast	Broadcast address for the assigned subnet.

Mobile Connection¶

Field	Description
Modem IMEI	International Mobile Equipment Identity — unique 15-digit identifier for the physical modem module. Used to identify the hardware to the cellular network.
Modem Rev	Firmware version of the modem module. Format: `<firmware>.<hw_version>.<date>.<other>`. Used for troubleshooting and identifying modem capabilities.
SIM IMSI	International Mobile Subscriber Identity — unique 15-digit identifier stored on the SIM card that identifies the subscription on the carrier's network.
SIM ICCID	Integrated Circuit Card ID — unique 19-20 digit identifier printed and embedded on the SIM card itself. Used to identify the physical card.
SIM Slot	Which physical SIM slot is currently active (`Primary (SIM1)` or `Secondary (SIM2)`). On devices with dual SIM, the secondary SIM automatically takes over if the primary fails.
SIM State	Status of the SIM card (`Connected` = recognized and authenticated, `Not Inserted` = no SIM detected, `Error` = SIM issue).
SIM APN	Access Point Name provisioned by the carrier. If blank, the carrier provides the APN automatically via OTA (Over-The-Air) provisioning.
Provider	Mobile carrier name (e.g., `Verizon`, `AT&T`, `Zero1`) determined by the SIM's IMSI.
Network	Current connected technology and configuration. Format: `<tech> (mode=<configured>, band=<locked>)`. Example: `LTE (mode=AUTO, band=auto)` means connected to LTE, mode is set to AUTO (modem choosing), and bands are not locked. For 5G: `NR5G (mode=NR5G, band=n78)` or `LTE-NSA (mode=AUTO, band=auto)` (LTE anchored to 5G).
Cell ID	Unique identifier of the current cellular base station (tower). Blank if not yet registered or not supported by the modem. Used for location and network diagnostics.
RSSI	Received Signal Strength Indicator in dBm. Indicates overall signal strength (`-67 dBm` = strong, `-100+ dBm` = weak). Quality rating: excellent (≤-70), good (-70 to -85), fair (-85 to -100), poor (>-100).
RSRP	Reference Signal Received Power in dBm (LTE/5G specific). Measures power of the reference signal from the base station (more precise than RSSI). Quality rating: excellent (≤-100), good (-100 to -115), fair (-115 to -130), poor (>-130).
SINR	Signal-to-Interference-plus-Noise Ratio in dB (LTE/5G specific). Measures signal quality relative to interference and noise. Higher is better; `N/A` indicates metric not available or not applicable.
RSRQ	Reference Signal Received Quality in dB (LTE/5G specific). Combined measure of RSRP and RSSI; indicates overall cell quality. Quality rating: excellent (>-8), good (-8 to -15), fair (-15 to -20), poor (<-20).

Physical Information¶

Field	Description
Link Detected	Physical presence of the modem (`yes` = detected and powered, `no` = not detected or disabled).