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¶
Set 5G mode¶
Band Lock¶
View status¶
show interface wwan0
================================================================================
Interface : wwan0
================================================================================
Network Information
----------------------------------------
Admin State : UP
Link State : UP
MAC Address : 9a:fb:90:59:30:f8
MTU : 1500 bytes
IPv4 Address : 10.157.37.202/0
IPv4 Broadcast : 10.157.37.202
Mobile Connection
----------------------------------------
Modem IMEI : 864624060795954
Modem Rev : RG255CGLABR01A04M4G
SIM IMSI : 525016143247533
SIM ICCID : 8965012501070124911F
SIM State : Connected
SIM APN :
Provider : Zero1
Network : LTE B3
Cell ID : B4B6668
RSSI : -71 dBm (good)
RSRP : -105 dBm (fair)
SINR : 9 dB (fair)
RSRQ : -14 dB (fair)
Physical Information
----------------------------------------
Link Detected : yes
================================================================================
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