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.
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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