Helmholz WALL IE User manual

Helmholz GmbH & Co. KG | Hannberger Weg 2 | 91091 Großenseebach | Germany
Phone [phone] | Fax [phone] | [e-mail] | www.helmholz.com
WALL IE / WALL IE PLUS - Industrial NAT Gateway and Firewall
Manual
Version 10 | 26.08.2022
Order numbers:
WALL IE 700-860-WAL01 as of firmware V 1.10.100
WALL IE PLUS 700-862-WAL01 as of firmware V 1.00.000
Link to the latest
version
of the manual

Notes
All rights reserved, including those related to the translation, reprinting, and reproduction of this
manual or of parts thereof.
No part of this manual may be reproduced, processed, duplicated, or distributed in any form
(photocopy, microfilm, or any other methods), even for training purposes or with the use of
electronic systems, without written approval from Helmholz GmbH & Co. KG.
To download the latest version of this manual, please visit our website at www.helmholz.de.
We welcome all ideas and suggestions.
Open Source
Our products contain open source software, among others. This software is subject to the respectively
relevant license conditions. We can send you the corresponding license conditions, including a copy
of the complete license text together with the product. They are also provided in our download area of
the respective products under www.helmholz.de.
We also offer to send you or any third party the complete corresponding source text of the respective
open source software for an at-cost fee of 10.00 Euro as a DVD upon request. This offer is valid for a
period of three years, starting from the date of product delivery.
Copyright © 2022 by
Helmholz GmbH & Co. KG
Hannberger Weg 2 | 91091 Großenseebach
Revision record:
Version
Date
Change
1
5/12/17
First version / Firmware V1.04
2 1/16/19 Conversion to application cases NAT and Bridge;
Addenda for firmware V1.08 (DHCP server/client, port ranges) and corrections
3
7/8/19
FW V1.08.100: SNAT added
4 9/27/19 Mistyping in Chap. 1.2
Updated QR-Codes and Hyperlinks
5 1/16/20 Firmware V1.08.200: update screenshots
Update of dimensions
6 4/8/20
Added note for Recycling / WEEE
Added pictures with higher resolution
Firmware V1.08.400: IP ranges for NAT rules
7 1/13/21
New: DNS server (Chap. 11.2)
New: ICMP in filter rules (Chap. 6.5, 7.4)
New: FTP-Helper in Bridge mode (Chap. 7.7)
8 18.02.2022 Update of security recommendations
Firmware V1.10.100: FTP Helper now also works in NAT mode
9
18.07.2022
Various text corrections
10
26.08.2022
Added WALL IE PLUS
STEP, TIA, and SIMATIC are registered trademarks of Siemens AG.

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Contents
1General............................................................................................................. 6
1.1 Target audience for this manual............................................................................................... 6
1.2 Safety instructions ................................................................................................................... 6
1.3 Note symbols and signal words ............................................................................................... 7
1.4 Intended use ........................................................................................................................... 8
1.5 Improper use........................................................................................................................... 8
1.6 Installation............................................................................................................................... 9
1.6.1 Access restriction ................................................................................................................. 9
1.6.2 Mounting and minimum distances ...................................................................................... 9
1.6.3 Electrical installation ............................................................................................................ 9
1.6.4 Protection against electrostatic discharges ........................................................................... 9
1.6.5 Overcurrent protection ........................................................................................................ 9
1.6.6 EMC protection ................................................................................................................. 10
1.6.7 Operation .......................................................................................................................... 10
1.6.8 Recycling / WEEE................................................................................................................ 10
1.7 Liability.................................................................................................................................. 11
1.7.1 Disclaimer of liability.......................................................................................................... 11
1.7.2 Warranty............................................................................................................................ 11
1.8 Open Source ......................................................................................................................... 11
2Security recommendations.............................................................................12
3Overview ........................................................................................................14
3.1 Setup of WALL IE (700-860-WAL01)....................................................................................... 15
3.2 Setup of WALL IE PLUS (700-862-WAL01) .............................................................................. 15
3.3 Connecting the WALL IE ........................................................................................................ 16
3.4 LEDs status information ......................................................................................................... 17
3.4.1 WALL IE (700-860-WAL01) ................................................................................................. 17
3.4.2 WALL IE PLUS (700-862-WAL01) ........................................................................................ 17
4Initial access to the web interface...................................................................18
4.1 Initial registration................................................................................................................... 19
4.2 Main view.............................................................................................................................. 20
4.2.1 Menu overview.................................................................................................................. 21
4.2.2 Responsive design ............................................................................................................. 21
4.3 Port assignment WAN/LAN .................................................................................................... 22

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5Choosing the operating mode........................................................................ 23
5.1 The NAT operating mode ...................................................................................................... 23
5.2 The Bridge operating mode ................................................................................................... 24
6Application “NAT” .......................................................................................... 25
6.1 Adjustment of the IP addresses in the NAT operating mode ................................................... 25
6.2 Activate DHCP client at the WAN interface ............................................................................. 26
6.3 Setting up “Basic NAT” rules.................................................................................................. 27
6.4 Packet filter “WAN to LAN” .................................................................................................... 29
6.5 ICMP Traffic “WAN to LAN” ................................................................................................... 31
6.6 Packet filter “LAN to WAN” .................................................................................................... 32
6.7 ICMP Traffic “LAN to WAN” ................................................................................................... 32
6.8 SNAT ..................................................................................................................................... 33
6.9 NAPT ..................................................................................................................................... 34
6.10 Port forwarding ..................................................................................................................... 35
7Application “Bridge” ...................................................................................... 37
7.1 Activate Bridge mode............................................................................................................. 37
7.2 Adjustment of the IP addresses in the bridge operating mode................................................ 37
7.3 Packet filter “WAN to LAN” .................................................................................................... 38
7.4 ICMP Traffic “WAN to LAN” ................................................................................................... 40
7.5 Packet filter “LAN to WAN” .................................................................................................... 41
7.6 ICMP Traffic “LAN to WAN” ................................................................................................... 41
7.7 FTP helper for active FTP ........................................................................................................ 42
8MAC address filtering .....................................................................................43
9Static routes....................................................................................................44
10 Use with Simatic Step 7 / TIA portal............................................................. 45
10.1 Application with step 7.......................................................................................................... 46
10.2 Use in the TIA portal .............................................................................................................. 47
11 Other functions............................................................................................49
11.1 DHCP server for LAN.............................................................................................................. 49
11.2 DNS-Server for LAN ............................................................................................................... 50
11.3 Host name (WAN).................................................................................................................. 51
11.4 Syslog server ......................................................................................................................... 52
11.4.1 Syslog local.................................................................................................................... 52
11.4.2 Syslog remote................................................................................................................ 52

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11.5 Change password / User management .................................................................................. 53
11.6 File certificate (HTTPS) ........................................................................................................... 55
11.7 Allow web interface access over WAN network (Web Interface Access) .................................. 55
11.8 Time settings (Time) .............................................................................................................. 56
11.9 Export/import of configuration .............................................................................................. 57
12 Firmware update .........................................................................................58
13 Resetting to factory settings ........................................................................ 59
13.1 Resetting to factory settings via the website........................................................................... 59
13.2 Resetting to factory settings with button ............................................................................... 59
14 FAQ ..............................................................................................................60
15 Technical data..............................................................................................61
15.1 Dimension drawing WALL IE (700-860-WAL01) ..................................................................... 63
15.2Dimension drawing WALL IE PLUS (700-862-WAL01)............................................................. 63

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1General
This operating manual applies only to devices, assemblies, software, and services of Helmholz GmbH
& Co. KG.
1.1 Target audience for this manual
This description is only intended for trained personnel qualified in control and automation
engineering who are familiar with the applicable national standards. For installation, commissioning,
and operation of the components, compliance with the instructions and explanations in this
operating manual is essential.
Configuration, execution, and operating errors can interfere with the proper operation of the WALL IE
and result in personal injury, as well as material or environmental damage. Only suitably qualified
personnel may operate the devices!
The specialist personnel is to ensure that the application or the use of the products described fulfills all
safety requirements, including all applicable laws, regulations, provisions, and standards.
1.2 Safety instructions
The safety instructions must be observed in order to prevent harm to living creatures, material goods,
and the environment. The safety notes indicate possible hazards and provide information about how
hazardous situations can be prevented.

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1.3 Note symbols and signal words
If the hazard warning is ignored, there is an imminent danger to life and health of people from electrical
voltage.
If the hazard warning is ignored, there is a probable danger to life and health of people from electrical
voltage.
If the hazard warning is ignored, people can be injured or harmed.
Draws attention to sources of error that can damage equipment or the environment.
Gives an indication for better understanding or preventing errors.

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1.4 Intended use
The WALL IE Industrial Ethernet Bridge and Firewall (“the device” in the following) connects two
Ethernet networks.
All components are supplied with a factory hardware and software configuration. The user must carry
out the hardware and software configuration for the conditions of use. Modifications to hardware or
software configurations that extend beyond the documented options are not permitted and nullify
the liability of Helmholz GmbH & Co. KG.
The device may not be used as the only means for preventing hazardous situations on machinery and
systems.
The WALL IE Industrial Bridge and Firewall cannot be used for a direct connection to the Internet.
Always use a dedicated router with a sufficiently dimensioned Internet firewall for an Internet
connection. Observe the security recommendations for project planning, use and maintenance (see
chap. 2).
Successful and safe operation of the device requires proper transport, storage, setup, assembly,
installation, commissioning, operation, and maintenance.
The ambient conditions provided in the technical specifications must be adhered to.
The device has a protection rating of IP 20 and must be installed in an electrical operating room or a
control box/cabinet in order to protect it against environmental influences. To prevent unauthorized
access, the doors of control boxes/cabinets must be closed and possibly locked during operation.
1.5 Improper use
The consequences of improper use may include personal injury to the user or third parties, data
protection breaches, as well as property damage to the control system, the product, or the environment.
Use the device only as intended!

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1.6 Installation
1.6.1 Access restriction
The modules are open operating equipment and must only be installed in electrical equipment
rooms, cabinets, or housings.
Access to the electrical equipment rooms, cabinets, or housings must only be possible using a tool or
key, and access should only be granted to trained or authorized personnel.
1.6.2 Mounting and minimum distances
The device can be mounted on a DIN rail and installed in any position. It is recommended to keep
minimum distances when mounting. By keeping the minimum distances
•the modules can be mounted or dismantled without having to dismantle other parts of the
system.
•there is enough space to connect all existing connections and contacting possibilities with
commercially available accessories.
•There is space for any necessary cable routing.
Installation must be carried out in accordance with VDE 0100/IEC 364 and applicable national standards.
The device has protection level IP20. If a higher degree of protection is required, it must be installed in
an enclosure or a control cabinet.
1.6.3 Electrical installation
Observe the regional safety regulations.
1.6.4 Protection against electrostatic discharges
To prevent damage through electrostatic discharges, the following safety measures are to be followed
during assembly and service work:
•Never place components and modules directly on plastic items (such as polystyrene, PE film) or in
their vicinity.
•Before starting work, touch the grounded housing to discharge static electricity.
•Only work with discharged tools.
•Do not touch components and assemblies on contacts.
1.6.5 Overcurrent protection
Overcurrent protection isn’t necessary as the device transports no load current. The power supply of
the device electronics is to be secured externally with a fuse of maximum 1 A (slow-blowing).

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1.6.6 EMC protection
To ensure electromagnetic compatibility (EMC) in your control cabinets in electrically harsh
environments, the known rules of EMC-compliant configuration are to be observed in the design and
construction.
1.6.7 Operation
Operate the device only in flawless condition. The permissible operating conditions and performance
limits must be adhered to.
Retrofits, changes, or modifications to the device are strictly forbidden.
The device is a piece of operating equipment intended for use in industrial plants. During operation,
all covers on the unit and the installation must be closed in order to ensure protection against
contact.
When the WALL IE is switched off, connections are interrupted! Before starting any work on the device,
make sure that no impermissible interference occurs in connected systems when the connections are
interrupted.
1.6.8 Recycling / WEEE
The company Helmholz GmbH & Co. KG is registered as a manufacturer with the HELMHOLZ brand
and the device type "Small devices of information and telecommunications technology for exclusive
use in households other than private households" as well as the following registration data:
Helmholz GmbH & Co. KG,
Location / Headquarters: 91091 Großenseebach,
Address: Hannberger Weg 2,
Name of authorized representative: Carsten Bokholt,
Registration number: DE 44315750
The electrical devices described in this document are to be recycled. According to Directive
2012/19/EU on waste electrical and electronic equipment (WEEE), they must not be disposed of by
municipal waste disposal companies.

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1.7 Liability
The contents of this manual are subject to technical changes resulting from the continuous
development of products of Helmholz GmbH & Co. K. In the event that this manual contains
technical or clerical errors, we reserve the right to make changes at any time without notice.
No claims for modification of delivered products can be asserted based on the information,
illustrations, and descriptions in this documentation. Beyond the instructions contained in the
operating manual, the applicable national and international standards and regulations must also be
observed in any case.
1.7.1 Disclaimer of liability
Helmholz GmbH & Co. KG is not liable for damages if these were caused by use or application of
products that was improper or not as intended.
Helmholz GmbH & Co. KG assumes no liability for any printing errors or other inaccuracies that may
appear in the operating manual unless there are serious errors of which Helmholz GmbH & Co. KG
was already demonstrably aware.
Beyond the instructions contained in the operating manual, the applicable national and
international standards and regulations must also be observed in any case.
Helmholz GmbH & Co. KG is not liable for damage caused by software that is running on the user’s
equipment that compromises, damages, or infects additional equipment or processes through the
remote maintenance connection, and which triggers or permits unwanted data transfer.
1.7.2 Warranty
Report any defects to the manufacturer immediately upon discovery of the defect.
The warranty is not valid in case of:
•Failure to observe these operating instructions
•Use of the device that is not as intended
•Improper work on and with the device
•Operating errors
•Unauthorized modifications to the device
The agreements met upon contract conclusion under “General Terms and Conditions of Helmholz
GmbH & Co. KG” apply.
1.8 Open Source
Among other things, our products contain open source software. This software is subject to the
relevant license terms. The relevant license terms, including a copy of the full license text, are
downloadable from the product website. They are also provided in our download area of the
respective products at www.helmholz.de.
Furthermore, we offer to send the complete corresponding source code of the respective open source
software to you and to any third party as a DVD upon your request for a contribution towards
expenses of Euro 10.00. This offer is valid for a period of three years. This offer is valid for a period of
three years, calculated from the delivery of the product.

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2Security recommendations
WALL IE is a network infrastructure component, and thus an important element in the security
considerations of a system or network. When using WALL IE, therefore please consider the following
recommendations in order to prohibit unauthorized access to plants and systems.
General:
•Ensure at regular intervals that all relevant components fulfill these recommendations and
possibly any other internal security guidelines.
•Evaluate your system holistically with a view to security. Use a cell protection concepts
(“defense-in-depth”) with corresponding products, such as the WALL IE.
•Regularly inform yourself about security threats for all your components
Physical access:
•Limit physical access to components of relevance to security to qualified personnel.
Security of the software:
•Always keep the firmware of all communications components up to date.
•Inform yourself regularly of firmware updates for the product.
•Only activate protocols and functions you really need
•If possible, always use those variants of protocols that provide more security
Passwords:
•Define rules and roles for usage of the devices and the awarding of passwords
•Change standard passwords
•Only use strong passwords. Avoid weak passwords like, for example, “password1”, “123456789”,
or similar.
•Ensure that all passwords are inaccessible to unauthorized personnel.
•Don’t use one password for various users and systems.
Helmholz is a member of the CERT@VDE. In addition to our technical newsletter, we communicate
our security-relevant updates, patches and advisories to you as a user of Helmholz products. Find out
more and use the services and database of the CERT@VDE to make your systems secure and keep
them secure.
The Helmholz "Product Security Incident Response Team" (PSIRT) supports you proactively to
protect your machines as best as possible in the context of industrial communication. Whenever new
potential threats occur or are reported to us, we evaluate and process them immediately and provide
you with recommended actions, patches and updates as quickly as possible to reduce the risk to a
minimum.
You can help too: Report any product incidents to our Product Security Incident Response Team at
[email protected] or [e-mail].

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You can find more information on the topic of security here, for example:
•CERT@VDE
•Sichere-industrie.de
•Bundesamt für Sicherheit in der Informationstechnik (BSI)
•Allianz für Cyber-Sicherheit

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3Overview
The WALL IE product series easily integrates machine networks into the higher-level company or
production network by means of network segmentation, packet and MAC address filtering.
Currently, the product series consists of two variants: WALL IE (700-860-WAL01) and WALL IE
PLUS (700-862-WAL01). Unless otherwise noted, this manual describes features that support both
devices equally.
WALL IE, the Industrial NAT Gateway and Firewall, simply integrates machine networks into the
high-level production or company network using network segmentation, packet and MAC address
filtering.
The NAT operating mode serves the forwarding of the data traffic between various IPv4 networks. It
enables the address translation via NAT and uses packet filters for the limitation of access to the
automation network located behind.
In the Bridge operating mode, the WALL IE acts as a network bridge in an IPv4 subnetwork. In
contrast to normal switches, packet filtering is possible in this operating mode. This means that the
restriction of access to individual areas of your network can be achieved without having to use
different networks for this purpose.
Features of the WALL IE:
•NAT (Basic NAT, SNAT, NAPT and port forwarding) for network segmentation
•Bridge functionality for securing network areas with identical IPv4 address ranges
•Access restriction through packet filters: IPv4 addresses, protocol (TCP/UDP), ports
•MAC address filtering with black and whitelisting
•DHCP server (LAN), DHCP client (WAN)
•Quick and easy configuration thanks to responsive web interface
•Static routes to other networks
•Reporting of events to a Syslog server
•Export/import of configuration
•Industry-compatible design for installation on DIN rails
•4x RJ45 interfaces 100 Mbps, 1x WAN + 3 x LAN (WALL IE, 700-860-WAL01)
•8x RJ45 interfaces 100/1000Mbps, WAN/LAN freely adjustable (WALL IE PLUS, 700-862-WAL01)

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3.1 Setup of WALL IE (700-860-WAL01)
The WALL IE has a 100 Mbps WAN port (P1) and three 100 Mbps LAN ports (P2-P4, switched).
A reset to factory settings can be initiated with the function button (FCN) (see ch. 12). The reset
button (RST) initiates a restart of the WALL IE.
3.2 Setup of WALL IE PLUS (700-862-WAL01)
The WALL IE PLUS has 8 switched ports with 100/1000Mbit (X1 P1- X1 P8). The ports can be assigned
as desired in the configuration of the WALL IE PLUS for WAN or LAN (see ch. 4.3). A LED on each port
indicates the assignment. On delivery, port P1 is set for the WAN network and ports P2 to P8 for the
LAN network.
A reset to factory settings can be initiated with the function button (FCN) (see ch. 12). The reset
button (RST) initiates a restart of the WALL IE PLUS.

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3.3 Connecting the WALL IE
The WALL IE must be supplied with 24 V DC at the wide range input 18-30 V DC via the provided
connector. Connection FE is for the functional ground. The WALL IE is designed exclusively for
operation with safety extra-low voltage (SELV/PELV).
The RJ45 socket "P1 WAN" of the WALL IE (700-860-WAL01) is used to connect the external network.
The RJ45 sockets "P2 LAN-P4 LAN" are switched and are used to connect the internal network.
The RJ45 sockets "X1 P1" to "X1 P8" of the WALL IE PLUS (700-862-WAL01) can be assigned to the
network WAN or LAN as desired. In the factory setting, port P1 is set for WAN and ports P2-P8 for
LAN. The LEDs next to the port indicate the assignment, orange for WAN and green for LAN. Chapter
4.3 explains how to configure the ports for LAN or WAN.
The inputs IN1 and IN2 do not yet have a function in the current firmware version but will be
available in a later firmware version for the external switching of firewall rules.
The housing of the WALL IE is not grounded. Please connect the functional earth connection (FE) of the
WALL IE properly to the reference potential.
The device may only be operated with power supplies that meet the specifications of EN/IEC 60950-1 for
power sources of limited capacity. Otherwise, the device must be operated in an enclosure that meets
the requirements of a fire protection enclosure according to EN/IEC 60950-1.

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3.4 LEDs status information
3.4.1 WALL IE (700-860-WAL01)
PWR
Off
No power supply or device defective
On
Device is correctly supplied with voltage
RDY
On
Device is ready to operate
ACT
Flashing light or on
Data transfer permitted between WAN and LAN
USR
Flashing light
Reset to works setting activated
RJ45 LEDs
Green (Link)
Connected
Orange (Act)
Data transfer at the port
3.4.2 WALL IE PLUS (700-862-WAL01)
PWR
Off
No power supply or device defective
On
Device is correctly supplied with voltage
RDY
On
Device is ready to operate
ACT
Flashing or on
Permitted data transfer between WAN and LAN
USR
Flashing
Reset to works setting activated
LEDs at
RJ45 Ports
Orange
Port is assigned to the WAN network
Green
Port is assigned to the LAN network
Green (Link) flashing
Connected with 100 Mbps
RJ45 LEDs
Green (Link) on
Connected with 1000 Mbps
Orange (Act)
Data transfer at the port

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4Initial access to the web interface
The WALL IE is delivered ex works with the IP address 192.168.0.100 and the subnet mask
255.255.255.0 on the LAN side. The web interface of the WALL IE (700-860-WAL01) can be accessed
via the LAN ports P2 - P4. With the WALL IE PLUS (700-862-WAL01), access is possible via the ports
P2 - P8 or via all ports whose LED lights up green in the delivery state.
The IP address of your network adapter must first
be set in accordance with the IP subnet of the
WALL IE: Start Settings Network and Internet
Change Adapter settings Properties 
Internet protocol version 4
Now connect a patch cable with the LAN
connection of your PC and one of the LAN ports
P2- P4 of the WALL IE.
The web interface can be reached in the delivery condition by entering URL “https://192.168.0.100”
in the browser page.
For security reasons, the web interface can only be reached through a secured HTTPS connection. An
exception rule must be confirmed in the browser once to reach the website. A certificate for the
connection backup can be stored in the “Device/HTTPS” menu.

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4.1 Initial registration
You will be prompted to set a password with the initial registration.
The password must have at least 8 characters
and may have a maximum of 128 characters. It
may contain special characters and numbers.
With the “Continue” button, the password is
stored in the device, and you will be forwarded
to the “Overview” page of the WALL IE.
The main user is always “admin”.
In addition to the main user “admin”, the “it-
user” and “machine-user” can also be used
with limited rights.
The users can be activated, and the affiliated
passwords set in the “Device/Password” menu.
Please note the password carefully! For security reasons it is not possible to reset the password without
setting the device to the factory settings.

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4.2 Main view
The “Overview” website of the WALL IE always opens after the login. The “Overview” main view
contains an overview of the most important settings and information of the WALL IE.
The topmost line contains the menu with the functions for configuration.
Please check at the website of the WALL IE or WALL IE PLUS for a newer firmware
version. The firmware update is described in chapter 12.
Link to firmware:
http://www.helmholz.de/goto/700-860-WAL01#tab-software
http://www.helmholz.de/goto/700-862-WAL01#tab-software