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Cross-Segment AP Management in Large-Scale Industrial Campuses: A Technical Solution

Cross-Segment AP Management in Large-Scale Industrial Campuses: A Technical Solution

Managing access points (APs) across a large industrial campus presents unique challenges, especially when dealing with segmented networks. To ensure seamless connectivity, efficient remote management, and robust performance, a reliable solution is critical.

This article explores the cross-segment AP management solution enabled by 524WiFi WL-AC1000, a powerful wireless controller designed for industrial applications.


The Challenges in Large-Scale AP Management

  1. Distributed Network Zones: Industrial campuses often consist of multiple zones, each requiring unique IP configurations for localized management. This creates challenges in monitoring and maintaining the network.
  2. Cross-Segment Communication: AP devices across different subnets may face difficulties in seamless data exchange or centralized control.
  3. Maintenance Complexity: Manual intervention is often needed to troubleshoot or update APs spread across the campus, increasing operational overhead.

WL-AC1000: A Simplified Approach to Cross-Segment Management

The WL-AC1000 is a versatile wireless controller that supports Multi-IP Settings, enabling centralized management of AP devices across segmented networks. Here’s how it works:

Multi-IP Configuration:

  • Assigns unique IP ranges for different AP groups (e.g., 10.10.10.X, 10.10.9.X, 10.10.8.X).
  • Simplifies network segmentation and reduces IP conflicts.

Centralized Control via Ethernet:

  • Connects all AP groups to the WL-AC1000 through a switch, providing a unified platform for remote configuration, monitoring, and updates.

Efficient Resource Allocation:

  • Ensures each AP group operates independently while remaining accessible through a central controller, optimizing network performance and reducing downtime.

Real-World Application

Imagine managing multiple AP zones in a manufacturing facility, port, or warehouse. With the WL-AC1000, IT teams can:

  • Monitor AP performance in real-time.
  • Push updates or troubleshoot without needing to access each AP physically.
  • Improve connectivity across different zones, ensuring uninterrupted operations.

Why Choose 524WiFi Wallys’ WL-AC1000?

The WL-AC1000 provides a robust and cost-effective solution for managing APs across large, segmented networks. Designed for industrial applications, it ensures:

  • Scalability for expanding network needs.
  • Reliability to handle demanding environments.
  • Ease of Use with intuitive configuration and management features.

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How to configure a Wi-Fi network using IW and IP utilities with wpa_supplicant


IW is a configuration utility for wireless devices and supports most if not all drivers implemented officially in the Linux kernel. It can be used to setup and connect to wifi networks as well as configure access points/hotspots on supported modems. It replaces the older iwconfig utility which is not recommended for use.
The IP utility is a routing tool that is used to configure network interfaces on your linux host and to configure bridges between devices.  

To list all wireless devices the command iw dev or /sbin/iw dev can be used and the response could look something like this:

phy#0

        Interface wlp1s0

                ifindex 4

                wdev 0x1

                addr 04:f0:21:3f:0a:a3

                type managed

                txpower 23.00 dBm

                multicast TXQ:

                        qsz-byt qsz-pkt flows   drops   marks   overlmt hashcol tx-bytes        tx-packets

                        0       0       0       0       0       0       0       0               0

To make sure that the device is up and running issue:
ip link show wlp1s0

In this case, the wireless device is wlp1s0 and for which command return the following:

4: wlp1s0: UP> mtu 1500 qdisc noqueue state DOWN mode DORMANT group default qlen 1000

    link/ether 04:f2:24:3d:2b:d9 brd ff:ff:ff:ff:ff:ff

If the device is not active and ‘UP’ it can be set active using:

sudo ip link set wlp1s0 up

To see if the device  is connected to a network or not, issue:

iw wlp1s0 link

Connected to b3:fa:d4:32:64:12 (on wlp1s0)

        SSID: 524wifi-5G

        freq: 5200

        RX: 4602636 bytes (28600 packets)

        TX: 17664 bytes (150 packets)

        signal: -53 dBm

        rx bitrate: 360.0 MBit/s VHT-MCS 8 40MHz short GI VHT-NSS 2

        tx bitrate: 6.0 MBit/s

        bss flags:      short-slot-time

        dtim period:    3

        beacon int:     100

If not, it simply returns ‘Not connected’

To see available wifi networks in range use the scan function of the modem:

iw wlp1s0 scan

********************SNIPPET*******************

BSS d0:21:f9:32:64:bb(on wlp1s0)

        last seen: 7092.798s [boottime]

        TSF: 1755910453320 usec (20d, 07:45:10)

        freq: 5220

        beacon interval: 100 TUs

        capability: ESS Privacy SpectrumMgmt ShortSlotTime RadioMeasure (0x1511)

        signal: -71.00 dBm

        last seen: 1704 ms ago

        Information elements from Probe Response frame:

  SSID: Techship

        Supported rates: 6.0* 9.0 12.0* 18.0 24.0* 36.0 48.0 54.0

        DS Parameter set: channel 44

 Country: SE     Environment: Indoor/Outdoor

                Channels [36 – 36] @ 23 dBm

                Channels [40 – 40] @ 23 dBm

                Channels [44 – 44] @ 23 dBm

                Channels [48 – 48] @ 23 dBm

                Channels [52 – 52] @ 23 dBm

                Channels [56 – 56] @ 23 dBm

                Channels [60 – 60] @ 23 dBm

                Channels [64 – 64] @ 23 dBm

                Channels [100 – 100] @ 30 dBm

                Channels [104 – 104] @ 30 dBm

                Channels [108 – 108] @ 30 dBm

                Channels [112 – 112] @ 30 dBm

                Channels [116 – 116] @ 30 dBm

                Channels [120 – 120] @ 30 dBm

                Channels [124 – 124] @ 30 dBm

                Channels [128 – 128] @ 30 dBm

                Channels [132 – 132] @ 30 dBm

                Channels [136 – 136] @ 30 dBm

                Channels [140 – 140] @ 30 dBm

        RSN:     * Version: 1

                 * Group cipher: CCMP

                 * Pairwise ciphers: CCMP

                 * Authentication suites: PSK

                 * Capabilities: 1-PTKSA-RC 1-GTKSA-RC (0x0000)

        BSS Load:

                 * station count: 4

                 * channel utilisation: 19/255

                 available admission capacity: 31250 [32us]

********************SNIPPET*******************

Make sure that the country parameter is correct, if not you can set the country code with the following:
sudo iw reg set SE

This ensures that the modem follows country-specific frequency regulations!

To connect to a password protected network (e.g. WPA version 1,2 or 3) a configuration file called wpa_supplicant.conf that handles the security protocol is needed:
 

wpa_passphrase SSID >> /etc/wpa_supplicant.conf

enter wifi password and hit enter

The generated output would look something like this:

network={

        ssid=”524wifi-5G”

        #psk=”password”

        psk=5abc7d89f8e9d8c7aa6b8c7d223e520d26a13e932bf0acb1d4580461d6d2ba8d

}

 If sudo privileges aren’t enough; login as root with: sudo -s and issue the above again.

When the file has been created it can be run in the background using:

sudo wpa_supplicant -B -D wext -i wlan0 -c /etc/wpa_supplicant.conf

Then check once more if the connection was successful with:
 iw wlp1s0 link

The last step is to request an IP adress from the host server via DHCP client:

dhclient wlp1s0

Issue ip addr show wlp1s0 to check assigned ip address and

if you have recieved one you are ready to surf!

For further information and features see:

en:users:documentation:iw [Linux Wireless] (kernel.org)
wpa_supplicant – ArchWiki (archlinux.org)
networking:iproute2 [Wiki] (linuxfoundation.org)

Note: Tested on Ubuntu 22.04 kernel 5.19