RFI U-router NGW User manual

Author
Ivo van Ling
Hardware Release
2.2
Quick Install Guide Version
RefGuide_U-routerNGW_v1.01.docx
Date
9-11-2020
Covering Product codes
RE.45.HCRG and RE.45.HCPG
U-router NGW
Universal wireless IoT data router
supporting LTE-M and GPRS
Reference Guide

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 1(57)
1 Table of Contents
2 INTRODUCTION .......................................................................................... 4
2.1 U-ROUTER NGW FEATURES ........................................................................... 4
2.2 U-ROUTER NGW VARIANTS ........................................................................... 4
3 CHECK YOUR PACKAGE CONTENTS .............................................................. 5
4 CONNECTORS AND STATUS LEDS ON THE U-ROUTER NGW.......................... 6
4.1 U-ROUTER NGW FRONT PANEL ....................................................................... 6
4.2 U-ROUTER NGW REAR PANEL ......................................................................... 6
4.3 ETHERNET PIN ASSIGNMENTS ......................................................................... 7
4.4 SERIAL PORT (RS232) PIN ASSIGNMENTS ......................................................... 8
4.5 EXPANSION PORT PIN ASSIGNMENTS ................................................................ 9
5 INSTALLATION OVERVIEW ....................................................................... 10
5.1 INSERTING THE SIM CARD .......................................................................... 10
5.2 CONNECTING POWER USING THE POWER ADAPTER ............................................... 11
5.3 CONNECTING POWER USING THE POEPOWER SUPPLY ........................................... 11
6 ACCESSING THE U-ROUTER NGW CONFIGURATION INTERFACE................ 12
6.1 CONSOLE LOGIN VIA SSH AND THE ETHERNET PORT (CLI) .................................... 12
6.2 LOGGING OUT (CLI) ................................................................................. 12
6.3 ACCESSING THE U-ROUTER NGW WEB GUI ..................................................... 13
7 DASHBOARD ............................................................................................. 14
7.1 SHOWING MOBILE CONNECTION INFORMATION................................................... 15
8 CONNECTING THE U-ROUTER NGW TO THE MOBILE NETWORK ................. 16
9 USER MANAGEMENT.................................................................................. 17
9.1 ADDING A NEW USER ................................................................................. 17
9.2 DELETING A USER ..................................................................................... 17
9.3 USER SHELLS .......................................................................................... 18
10 TIME SYNCHRONIZATION...................................................................... 19
11 CONNECTING EXTERNAL RELAY(S) TO THE EXPANSION PORT............... 20
11.1 USING A SLAVE REMOTE POWER SWITCH WITH THE U-ROUTER NGW ......................... 20
11.2 USING RS485 (RIOT) REMOTE POWER SWITCHES WITH THE U-ROUTER NGW ............ 22
11.3 LED INDICATORS ON THE RPSW ................................................................... 23
11.4 LAST RELAY POSITION IS SAVED IN THE EEPROM................................................ 23
12 CONNECTING TO CONSOLE PORTS OF REMOTE DEVICES ....................... 24
12.1 CONNECTING AN RS232 SERIAL CONSOLE PORT ................................................. 24
12.2 CONNECTING A USB CONSOLE PORT FOR CISCO DEVICES ...................................... 26
12.3 CONNECTING A USB CONSOLE PORT FOR JUNIPER DEVICES .................................... 28
12.4 ACCESSING THE CONSOLE INTERFACE OF THE CONNECTED DEVICE ............................ 30
12.4.1 Console Access from the >_Terminal tab in the Web GUI..................... 30
12.4.2 SSH login with a user that connects straight to the console port ........... 32
12.4.3 Console Access from Command Line: ngw-term.sh ........................... 33
12.4.4 Console Access from Command Line: minicom.................................. 34
13 CLI COMMANDS ..................................................................................... 35

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RefGuide_U-routerNGW_v1.01.docx Page: 2(57)
13.1 WHAT IS THE CLI..................................................................................... 35
13.2 COMMAND SYNTAX ................................................................................... 35
13.3 COMMAND CONVENTIONS............................................................................ 35
13.4 STATUS COMMAND OF THE U-ROUTER NGW: NGW-CLIENT ..................................... 35
13.5 RETRIEVING THE STATUS OF THE U-ROUTER NGW: NGW-CLIENT STATUS .................... 35
13.6 RETRIEVING THE MOBILE INFORMATION OF THE U-ROUTER NGW: NGW-CLIENT MOBILE ... 36
13.7 RETRIEVING THE INTERFACES OF THE U-ROUTER NGW: NGW-CLIENT INTERFACE ........... 37
13.8 RETRIEVING THE RELAY INFORMATION OF THE U-ROUTER NGW: NGW-CLIENT RELAY....... 37
13.9 CHECKING TIME SERVER INFORMATION............................................................. 39
14 API REFERENCE ..................................................................................... 40
14.1 BASE URL ............................................................................................. 40
14.2 AUTHENTICATION ..................................................................................... 40
14.3 ERRORS ................................................................................................ 40
14.4 AVAILABLE ENDPOINTS............................................................................... 41
14.5 STATUS ................................................................................................ 42
14.6 STATISTICS ............................................................................................ 43
14.7 RELAY .................................................................................................. 45
14.8 INTERFACE ............................................................................................. 46
14.9 MOBILE................................................................................................. 48
14.10 USER ................................................................................................ 50
14.11 SETTINGS........................................................................................... 52
14.12 OPENVPN .......................................................................................... 54
14.13 TIMESERVER........................................................................................ 56

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 3(57)
Disclaimer
The specifications and information regarding the products in this manual are subject to change
without notice. All statements, information, and recommendations in this manual are believed to be
accurate but are presented without warranty of any kind, express or implied. Users must take full
responsibility for their application of any products.
Notwithstanding any other warranty herein, all document files and software are provided “as is” with
all faults. RFI Engineering B.V. disclaims all warranties, expressed or implied, including, without
limitation, those of merchantability, fitness for a particular purpose and noninfringement or arising
from a course of dealing, usage, or trade practice.
In no event shall RFI Engineering B.V. or its suppliers be liable for any indirect, special,
consequential, or incidental damages, including, without limitation, lost profits or loss or damage to
data arising out of the use or inability to use this manual, even if RFI Engineering B.V. or its suppliers
have been advised of the possibility of such damages.
Revision History
Revision
Reason
Author
Date
1.00
First version for U-router NGW.
Software release: ngw-daemon 1.80 [Nov 2 2020
07:54:14] and hardware release 2.2.
IvL
08 Nov. 2020
1.01
Added ‘reset-factory’ and ‘reboot’ to the POST
parameters on the /api/settings endpoint
IvL
09 Nov. 2020

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 4(57)
2 Introduction
The U-router NGW is a universal wireless IoT data router supporting the latest in wireless technology.
The U-router NGW is designed for operation in LTE bands 2, 3, 4, 5, 8, 12, 13, 20 and 2G Quad-
band. The carrier-grade U-router NGW features a low power relay for remote control of devices.
With the additional Single Port Remote Power Switch (RE.99.R1Nx) external high-power equipment
can be remotely controlled.
The U-router NGW also provides a terminal server for remote service assurance and/or out-of-band
management of network equipment. Using the U-router NGW to connect to the router console
interface, IT administrators can remotely troubleshoot and repair network equipment. Personnel no
longer need to be deployed to manually reset networking equipment, dramatically reducing the
number of field visits.
2.1 U-router NGW Features
LTE & 2G CELLULAR WAN
• Radio band global model (RE.45.HCRG and RE.45.HCPG)
Cat M1/NB1 deployed bands: 2, 3, 4, 5, 8, 12, 13, 20, 26*, 28*; EGPRS quad-band,
850/900/1800/1900 MHz (* roaming bands)
• Radio bands Verizon Wireless model (RE.45.HCRV and RE.45.HCPV)
Cat M1 bands: 2, 4, 5, 12, 13
HOST INTERFACES
• 10/100 Base-T RJ45 Ethernet port
• RS-232 Serial Console Port on RJ-45 connector (Cisco compatible)
• RS-485 Serial protocol on RJ-11 connector
• USB-A 2.0 Connector
• SMA antenna connector
INPUT/OUTPUT
• Digital output (dry contact)
MANAGEMENT INTERFACES
• Web-Based User Interface
• Command Line Interface
• HTTP Rest-API
2.2 U-router NGW variants
There are four variants of the U-router NGW. Two variants are powered by a 5.1V microUSB power
supply and two variants that can be powered by an 48V Power-over-Ethernet power supply.
5.1V micro USB power
48V Power-over-Ethernet
Global 4G/2G radio
RE.45.HCRG
RE.45.HCPG
Verizon USA radio
RE.45.HCRV
RE.45.HCPV
This document provides information on the following topics:
• U-router NGW Package contents.
• U-router NGW connectors and interfaces.
• Login on Web User Interface

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 5(57)
3 Check Your Package Contents
There are two variants of the U-router NGW. The first variant (RE.45.HCRG and RE.45.HCRV) is
powered by a worldwide 110-240VAC power supply with changeable heads for use in EU, UK,
Australia, USA and Japan. This power supply connects to the micro USB port on the U-router NGW.
The second variant (RE.45.HCPG and RE.45.HCPV) is an 48V Power-over-Ethernet variant and is
powered by a single port PoE injector.
These are the items included with the (non-PoE) U-router NGW variant:
These are the items included with the (PoE) U-router NGW variant:
Universal 5V micro-USB
power supply
U-router NGW
4G LTE/3G/2G Ultra Wideband
Hinged Connector Antenna (698-
960, 1710-2170, 2500-2700
MHz)
Single port PoE injector
U-router NGW
4G LTE/3G/2G Ultra Wideband
Hinged Connector Antenna (698-
960, 1710-2170, 2500-2700
MHz)

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 6(57)
4 Connectors and status LEDs on the U-router NGW
This section provides an overview of the connectors and status LEDs on the U-router NGW unit.
4.1 U-router NGW front panel
Figure 1: U-router NGW front view
1 – Power
Blue, Power LED.
- LED on = power on
2 – Contact
Green, Contact/Relay status.
- LED off = contact open
- LED on = contact closed
3 – Modem
Green
- LED flashing 500ms on/off = searching for network,
- LED flashing on, on, off = found network waiting for data connection,
- LED on, flashing off, off = data connection operational
4 – Alert
Green
- LED flashing when an error has occurred
5 – Serial
RJ45 serial port, Cisco console port compatible
6 – Exp
Expansion port
- Contact normally open
- RS485 RIOT/Modbus
4.2 U-router NGW rear panel
Figure 2: U-router NGW rear view
1 – USB-B
USB expansion port
2 – ETH
RJ45 Ethernet connector
3 – PWR USB-A
5.1V power connector 2.5A
4
SMA antenna connector (2G/4G)

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 7(57)
4.3 Ethernet Pin Assignments
Figure 3: Ethernet pin assignment for NON-PoE variant
Figure 4: Ethernet pin assignment for PoE variant
Please note: the PoE variant (RE.45.HCPG and RE.45.HCPV) of the U-router NGW must NOT
be powered by the 5.1V micro USB power supply AND the 48V PoE power supply simultaneously.
The PoE variants of the U-router NGW contain a 48DC to 5V convertor/power supply that is internally
connected to the 5V micro USB port of the router. Connecting both power supplies might result in
damage to the power supply circuits of the U-router NGW with PoE.

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 8(57)
4.4 Serial Port (RS232) Pin Assignments
The U-router NGW supports a serial port on an RJ45 connector on the front panel. The signal levels
are compatible with TIA/EIA-232-F levels. The RS232 receiver has a typical threshold of 1.3 V, a
typical hysteresis of 0.5 V, and can accept ±30-V inputs. The pinout of the RJ45 connector is such
that a standard Ethernet cable can be used to connect a Cisco console port.
The transmit and receive pin can be swapped in software so that different types of cable can be
used. For example; swapping the transmit (6) and receive (3) pin enables a Cisco roll-over cable to
be used between the U-router NGW and the Cisco RJ45 console port.
Figure 5: Serial port configured for Ethernet cable
Figure 6: Serial port configured for Cisco Cross Cable (pin 3 and 6 swapped)
The default configuration for the serial port is: “Ethernet Cable”.

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 9(57)
4.5 Expansion Port Pin Assignments
The U-router NGW supports an expansion port on an RJ11 connector on the front panel. The
expansion port has a low power relay contact on the two middle pins (pin 3 and 4) of the connector.
Pins 2 and 5 of the RJ11 connector are used for an RS485 serial interface in accordance with EIA/TIA-
485 standard. This interface can be used to run a two-wire Modbus protocol or the RFI RIOT protocol.
Pins 1 and 6 are not connected. They may be used in future hardware versions of the U-router NGW.
Figure 7: Expansion port on RJ11 connector
Please note: The relay is specified for low power devices only. This means that the maximum
ratings are 100V @ 500mA for switching purposes maximum. In case you want to switch higher
voltages and/or higher currents you need to connect an external relay, such as RFI Engineering’s
single port remote power switch; RE.99.R1NC.

The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 10(57)
5 Installation Overview
The U-router NGW is a radio device capable of transmitting and receiving in the Cat M1/NB1
deployed bands: 2, 3, 4, 5, 8, 12, 13, 20, 26*, 28*; EGPRS quad-band, 850/900/1800/1900 MHz
bands. Because the U-router NGW unit operates in the radio frequency bands it can be susceptible
to interference that can reduce range. Install the U-router NGW in such a way that adequate
LTE/GSM reception is obtained. You can see the LTE/GSM signal levels in the configuration menu of
the U-router. Please see paragraph 7.1 for retrieving the GSM/LTE status.
5.1 Inserting the SIM card
In order to start using the U-router NGW you need to insert a miniature SIM card. Please make sure
the SIM card is a data card. The SIM card holder is located inside to the U-router NGW and can
only be accessed by unscrewing the four screws in the bottom of the unit using a Phillips screw
driver. To insert a SIM card, take the following steps:
1. Make sure the U-router NGW is switched off, by unplugging the power supply.
2. Unscrew the four screws in the bottom of the unit.
3. Turn the unit over and carefully lift the top off the unit.

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4. The SIM card holder is located on the little LTE daughter board close to the 2G/4G SMA
antenna connector.
5. Insert the SIM card with the connections facing towards the daughterboard into the SIM
card holder. Pay attention to the correct position. The SIM card has a small cut off corner
which is located on the bottom right corner in the picture below.
The SIM card should ‘click’ into place.
6. Re-assemble the unit, taking the above steps in reverse order.
5.2 Connecting Power using the Power Adapter
Connect the supplied power adapter to the power port of the U-router NGW. The power port is
labeled: “PWR”. The plug the power adapter into a power outlet.
5.3 Connecting Power using the PoE Power Supply
Connect the PoE cable of a PoE switch, or the supplied PoE adapter, to the “ETH” port of the U-
router NGW.

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 12(57)
6 Accessing the U-router NGW Configuration Interface
All configuration of the U-router NGW is done through the command line interface (CLI) or the WEB
GUI. To start configuring the unit you have to log into the U-router NGW using a username and
password. The default user on the U-router is called “rfi” and has password “rfi123”. The command
line interface can either be accessed through the Ethernet port of the unit, of through the GSM/LTE
interface.
6.1 Console Login via SSH and the Ethernet Port (CLI)
Connecting via SSH is usually a simple procedure, but requires some knowledge of how to configure
the network settings of your desktop or laptop PC. When the U-router ships, the unit has been
configured with a static IP address. In order to log in to the U-router NGW you can connect a laptop
or desktop computer to the Ethernet port of the unit. In case you connect a computer directly to the
U-router NGW please make sure you use a cross Ethernet cable.
The default IP address of the U-router is set to 192.168.168.1
After configuring your PC to be able to contact the U-router, you can login using your favorite SSH
client. SSH clients can be downloaded from for example http://www.ssh.com (OpenSSH) or
http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html (PuTTY). In our examples the
PuTTY client will be used. Consult your SSH client documentation if you use a different SSH client.
To connect to your U-router for the first time using the PuTTY client, start the client from the
Windows START menu. Enter the IP address (192.168.168.1), User Name (rfi) and port number
(22) for the U-router NGW in the dialogue box:
Host Name: 192.168.168.1
User Name: rfi
Port Number: 22
Then click the Open button
When connected the unit prompts you to enter a username and a password:
login as: rfi
[email protected]'s password:
The default password of the unit is set to ‘rfi123’.
6.2 Logging out (CLI)
Before going further, you should know how to log out of the system. By typing “exit” in the U-
router NGW CLI you are automatically logged out.

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 13(57)
6.3 Accessing the U-router NGW WEB GUI
The U-router NGW WEB configuration interface can be accessed via static IP address assignment.
By default, the ETH interface is assigned a static IP address of 192.168.168.1.
In order to access this interface, you will have to configure your host system with a static IP address
on the 192.168.168.x subnet. Then launch your web browser.
Type https://192.168.168.1 in the address field and press ENTER or RETURN.
The login screen will appear. Enter rfi in the Username field and rfi123 in the password field of the
login box.
Figure 8: U-router NGW Login Screen
The U-router NGW configuration interface will appear, allowing you to customize your settings as
needed.
You can navigate through the Web GUI by clicking on the menu items on the left.

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 14(57)
7 Dashboard
The Dashboard screen displays a summary of the system information, current values of the basic
configuration settings, wireless network settings and information, and wireless signal strength
statistics.
Figure 9: System information showing software and hardware version
The System tab show basic information about the system, such as the software and hardware
version. The modem contains an LTE modem, model SARA-R412M-02B.

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RefGuide_U-routerNGW_v1.01.docx Page: 15(57)
7.1 Showing Mobile Connection Information
When you scroll down on the Dashboard page you will find the information about the mobile
connection, such as the information about the mobile network connection, signal strength and
registration states.
Figure 10: Showing mobile connection information and registration status
Figure 11: Showing wireless signal strength over time

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8 Connecting the U-router NGW to the Mobile Network
In order to connect the U-router NGW to the mobile data network you will have to insert a SIM card
as described in paragraph 5.1.
In most cases, to configure your U-router NGW to connect to your mobile operator the only
information required is the APN and sometimes a username and password – all other fields may be
left at their defaults. When you purchase your mobile SIM card, your mobile operator will provide
you with various settings. These settings vary by operator and subscription and may include:
• APN
• Username & password
• PIN code
Activation of the mobile data connection can be done on the Mobile tab of the Web GUI. When your
SIM requires a PIN, this can also be configured on the same page.
For example, to configure the U-router NGW to connect to the Vodafone network in the Netherlands
you would need to enter the APN: office.vodafone.nl, user: vodafone, password: vodafone.
For example:
Figure 12: Example to configure APN for Vodafone in the Netherlands

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RefGuide_U-routerNGW_v1.01.docx Page: 17(57)
9 User management
Since the U-router NGW is running Linux, as a multi-user operating system, several people may be
logged in and actively working on a given machine at the same time. Security-wise, it is never a
good idea to allow users to share the credentials of the same account. In fact, best practices dictate
the use of as many user accounts as people needing access to the U-router NGW. At the same time,
it is to be expected that two or more users may need to share access to certain system resources,
such as directories, files and access to the console ports. User management on the U-router NGW
allows us to accomplish both objectives.
User management is normally performed through the Web GUI. The default user on the system is:
‘rfi’ with password: ‘rfi123’. Factory default settings for this user are:
Username: rfi
Password: rfi123
Shell: bash
This user cannot be deleted from the web GUI. It is advised to change the default password to a
more secure one during installation of the system.
9.1 Adding a new user
You can add a new user by going to the Users tab and then clicking on the green Add user
button. Choose a username and password for the new user. In the example below the user is
created to have SSH shell login capability.
9.2 Deleting a user
You can delete any user, except user rfi, from the Web GUI. Click on the red ‘Delete User’ button
behind the username to delete the user. There will be a popup asking if you are sure to delete the
user. Once deleted there is no restore function, other than adding the user back using the Add
user function described above.

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laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx Page: 18(57)
9.3 User shells
Users can have different shells on the U-router NGW system. For example, some users are not
allowed to use SSH and then perform CLI commands. Other users are meant to have direct access
to the Console port of the connected Enterprise Router. User can have 4 different shell types,
dependent on their role.
The four different shell types available:
Shell
Purpose
Bash
User has Web GUI and SSH access. When the user logs
in using SSH he/she will get a CLI prompt. Similar
to: rfi@rfi-000102:~$
Minicom
User has Web GUI and limited SSH access. When the
user logs in using SSH he/she will get a minicom
terminal. No shell commands can be given.
Terminal
User has Web GUI access. When logged in over SSH
the user is connected straight to the Console port
of the attached Enterprise Router.
GUI-only
User has Web GUI access only. No SSH login is
allowed
The shell type for each user can be set on the Users tab.
Figure 13: Different types of login shells available for users

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10 Time Synchronization
The U-router NGW synchronizes its internal clock using the Network Time Protocol (NTP). This NTP
is a protocol that synchronizes the clocks on computers that are connected to the Internet. Some
Internet Service Providers (ISPs) do not have NTP servers or block the default NTP server that the
U-router NGW connects to. As a result, the internal clock of the U-router might not be running
correct until your router obtains the correct date and time from the NTP server.
The U-router NGW also contains an internal NTP server that is synchronized against the network
time of the mobile network. Not all mobile networks support this time feature. The internal NTP
server will only serve the time to the U-router NGW when the correct time is acquired from the
mobile network.
Configuration of the time synchronization is done through the Time Servers tab. The U-router NGW
runs a process called: timesyncd. This process is responsible for keeping the time of the U-router
synchronized to the internal and external time servers. When the timesyncd process is started and
running correctly this is indicated by the green dot behind Server state in the Web GUI.
You can specify your own NTP servers in the edit box on the time server page with the NTP= option.
Time servers can be specified by IP address or by fully qualified domain name. In the example below
the line: NTP=127.0.0.1 213.251.52.43 91.236.251.11 instructs the U-router NGW to use 3 time
servers:
• 127.0.0.1, the internal time server, synced to the mobile network
• 213.251.52.43, external time server on the Internet
• 91.236.251.11, external time server on the Internet
If you want to stop synchronizing the U-router NGW time and date to the mobile network clock
simply remove the 127.0.0.1 entry from the configuration.