200 episodes

A weekly podcast about wireless network engineering. Wireless topics on education, wireless design, tips, interviews with other wireless engineers, tech news about wireless, and the products we configure. A podcast for any wireless professional or enthusiast.

Clear To Send: Wireless Network Engineering Rowell Dionicio and François Vergès

    • Tech News
    • 4.7, 52 Ratings

A weekly podcast about wireless network engineering. Wireless topics on education, wireless design, tips, interviews with other wireless engineers, tech news about wireless, and the products we configure. A podcast for any wireless professional or enthusiast.

    CTS 232: Introduction to 5G with Andrew Von Nagy

    CTS 232: Introduction to 5G with Andrew Von Nagy

    In this episode, we are talking with Andrew Von Nagy from Celona about 5G.

    What will 5G technology bring to the table? Increase speed, more spectrum band use, CBRS at 3.55 GHz, C-Band (3.7 to 4.2), 6 GHz for unlicensed 5G (licensed assisted access), and millimeter wave (60 GHz).

    With 5G, comes new use cases. New hardware will be required and we’ll hear terms like 5G-NR which means new radio. Other terms you should know is G-Node-B (the name of the AP in 5G) and Node-B, from 4G.

    Do Wi-Fi Engineers care about 5G? Yes! It’s more accessible than the past and is driven by the use case to meet business needs. There’s a lower barrier to entry, no longer high and it becomes another tool in the tool bag.

    Complementary to Wi-Fi. Private 4G & 5G can handle devices that need an express lane handled by the corporation. The traffic can be scheduled in a granular fashion.

    Design is still going to be critical but you aren’t designing the network the same way. You need a different mindset. Handover is treated differently and there isn’t co-channel interference because of increased coordination. There is a minimum amount of signal separation between access points on the same channels.

    Some of the tools that can be used are iBwave, Google outdoor planner (beta), and RAN Plan.

    This is a great episode to listen to if you want to get a start with 5G before diving into the technical details.

    Links & Resources

    * Celona Website: https://www.celona.io* Andrew’s website: http://www.revolutionwifi.net* Celona YouTube videos: https://www.youtube.com/playlist?list=PLW8PqCtRwgZO3fiXJMtzIiYqh5Itr9BO5

    • 1 hr 7 min
    CTS 231: Transitioning to Industry 4.0 with Kilian Löser

    CTS 231: Transitioning to Industry 4.0 with Kilian Löser

    We had the pleasure to have Kilian Löser on the show to talk about Wi-Fi in manufacturing envrionments. We took the opportunity to talk about what is coming up and how these environments are evolving with Industry 4.0.

    Feel free to follow Kilian on LinkedIn (https://www.linkedin.com/in/loeserkilian/) and Twitter(@KilianLoeser).

    In this episode, we’ve talk about the following topics:

    * Situation today in warehouses and manufacturing environments* Different wireless use cases we can find today* Different problems around Wi-Fi networks in these environments* Definition of what Industry 4.0 means* The need for multiple wireless protocols* The proprietary wireless protocol from Siemens: iPCF-MC* New set of devices expected to be used in these environments (AGV, AMR)* Wi-Fi 6 in the manufacturing environment* The factory of the future (use cases)

    You can download Kilian’s Whitepaper on Wi-Fi 6 here: https://new.siemens.com/global/en/products/automation/industrial-communication/industrial-wireless-lan.html#Whitepaper


    * WLPC Prague 2019 Presentation from Maksim Getman: Steel Factory Wi-Fi | Maksim Getman | WLPC Prague 2019* WLPC Prague 2019 Presentation from Yosef Graziano: Wi-Fi for Challenging Environments | Yosef Graziano | WLPC Prague 2019* Video, explanation of the iPCF-MC protocol: https://assets.new.siemens.com/siemens/assets/api/uuid:4bdccad2-362a-41db-b3ef-8c07b884a5db/version:1574068623/ipcf-mc-en.mp4* Video, explanation of the iPCF protocol: https://assets.new.siemens.com/siemens/assets/api/uuid:4513b9f0-37d0-4a32-aa9e-e0e64549abdf/version:1574068635/quick-roaming-rcoax-with-ipcf-en.mp4* The factory of the Future (Factory 56 Daimler): https://www.youtube.com/watch?reload=9&v=UdDvDKC8FVM* The factory of the Future (Porsche Taycan): https://new.siemens.com/global/en/markets/automotive-manufacturing/references/porsche.html* Whitepaper on Wi-Fi 6 by Siemens (Kilian): https://new.siemens.com/global/en/products/automation/industrial-communication/industrial-wireless-lan.html#Whitepaper* Details on Siemens AGV SIMOVE concept: https://assets.new.siemens.com/siemens/assets/public.1560752109.542c7044-05c4-4af2-8c9a-e77f85520cf6.simove-agv-flyer-v3.pdf

    • 1 hr 2 min
    Mobility Field Day 5, pySerial, Podcast Update

    Mobility Field Day 5, pySerial, Podcast Update

    Welcome to the coffee hour ☕️

    This is a casual Clear to Send (CTS) conversation over coffee where we talk about different topics. In this hour, we run through different topics from recent evThis is a casual Clear to Send (CTS) conversation over coffee where we talk about different topics. In this hour, we present the upcoming Mobility Field Day 5, talk about a fun Python library called pySerial and give you an update on the podcast.

    Subscribe to our YouTube channel to see more videos from us.


    * Mobility Field Day 5* Presentation of the event* Presentation of the delegates* Presentation of the vendors* Our predictions* Python library: pySerial* Presentation of pySerial* Showcase of an example on how to use it* Clear To Send update* Courses* Practical Guide for Wi-Fi Site Surveys* New course coming: Ignite CWNA* Podcast numbers are great this months

    Link & Ressources

    * Mobility Field Day 5: https://techfieldday.com/event/mfd5/* pySerial: https://pyserial.readthedocs.io* SemFio’s blog on pySerial: https://www.semfionetworks.com/blog/establish-a-console-connection-within-a-python-script-with-pyserial* pySerial example: https://github.com/francoisverges/semfio-cisco/blob/master/pyserial-example/show-ap-summary.py* More pySerial scripts: https://github.com/francoisverges/semfio-cisco/blob/master/Setup-APoS-EWC/setup-APoS-EWC.py* CTS Courses: https://courses.cleartosend.net/* A Practical Guide to Site Survey: https://courses.cleartosend.net/p/a-practical-guide-to-wi-fi-site-surveys* Ignite CWNA Course Interest: https://cwnatraining.com

    What did you think of our live demo near the end of the Coffee Hour? Let us know in the comments below.

    Thank you for your continuous support. If you want to keep on supporting us, here are your options:

    * Purchase a course from courses.cleartosend.net* Buy us a kofi: https://ko-fi.com/cleartosend

    • 1 hr 11 min
    CTS 230: OpenRoaming

    CTS 230: OpenRoaming

    In this episode, we welcome’s Tiago Rodrigues, CEO of the Wireless Broadband Alliance, and Matt MacPherson, Wireless CTO at Cisco to talk about OpenRoaming.

    The Wireless Broadband Alliance recently took over the ownership and management of OpenRoaming from Cisco. We had a great time and great discussion with Tiago and Matt and hope that you like it!

    One hour was definitely not enough time to talk about OpenRoaming, however, in this episode, we talked about the following topics:

    * OpenRoaming, giving a definition to what it is* Why the WBA decided to take over* Why Cisco decided to hand it over to the WBA* The current momentum behind OpenRoaming when it comes to vendors, manufacturers and identity providers* Components of OpenRoaming* How OpenRoaming will benefit big and small businesses* The role of the brokers

    We only touched the surface on some of the components of OpenRoaming. We will follow up with other episodes to dive deeper into some the these components.

    As we start to implement in our networks, we will also be able to follow up with episodes talking about how it works technically speaking.

    Thank you again Tiago and Matt for your time!


    * Official OpenRoaming website: http://www.openroaming.org* OpenRoaming FAQ: https://wballiance.com/openroaming/faq/* Integrate Eduroam with OpenRoaming: https://wiki.geant.org/display/H2eduroam/Roaming+with+third+parties+based+on+Passpoint* Press release from WBA: https://wballiance.com/wba-assumes-control-of-openroaming/* Press release from WBA:https://wballiance.com/wba-openroaming-opens-the-door-to-create-one-global-wi-fi-network/* Use Case OpenRoaming: https://newsroom.cisco.com/press-release-content?type=webcontent&articleId=2085155* Use Case OpenRoaminghttps://www.reuters.com/article/us-britain-wifi/londons-canary-wharf-pioneers-seamless-wi-fi-roaming-idUSKBN2425D1* Previous episode on OpenRoaming with Jérôme Henry: https://www.cleartosend.net/cisco-openroaming/* Previous episode on the WBA with Tiago Rodrigues and Gabriel Desjardins: https://www.cleartosend.net/cts-219-wireless-broadband-alliance-with-tiago-rodrigues-and-gabriel-desjardins/* Presentation: Understanding OpenRoaming and the Device Ecosystem Project – Jérôme Henry: https://www.youtube.com/watch?v=BJxOChcOmyI&t=314s* Presentation: Cisco OpenRoaming to Better Bridge Between Mobile and Wi Fi Networks – Matt MacPherson: https://www.youtube.com/watch?v=rW5I6csmF1o

    CTS 229: Introduction to WPA3

    CTS 229: Introduction to WPA3

    In this episode, we are providing an introduction to WPA3. We also show how to configure it on a Cisco controller as well as how you could validate it by looking at Wi-Fi frames:


    WPA3 is the improved version of Wi-Fi security. It updates WPA2 which is commonly used everywhere in Wi-Fi networks. 

    Why the need for WPA3?

    * KRACK Attack* https://www.cleartosend.net/cts-094-sealing-krack-attack/* WPA2-PSK is subject to dictionary attacks

    WPA3 brings the following:

    * Increased crypto strength* Dumps legacy protocols* Mandates Protected Management Frames (PMF)* https://www.cleartosend.net/802-11w-management-frame-protection/* Mandatory for Wi-Fi 6 (more and more devices will support WPA3)

    There are two versions of WPA3 which are similarly named from WPA2:

    * WPA3-Personal* Pre-shared Key* Simultaneous Authentication of Equals (SAE) is used* WPA3-Enterprise* Builds upon WPA2-Enterprise* Enhanced encryption* WPA3-Enterprise also offers an optional mode using 192-bit minimum-strength security protocols and cryptographic tools to better protect sensitive data:* Authenticated encryption: 256-bit Galois/Counter Mode Protocol (GCMP-256)* Key derivation and confirmation: 384-bit Hashed Message Authentication Mode (HMAC) with Secure Hash Algorithm (HMAC-SHA384)* Key establishment and authentication: Elliptic Curve Diffie-Hellman (ECDH) exchange and Elliptic Curve Digital Signature Algorithm (ECDSA) using a 384-bit elliptic curve* Robust management frame protection: 256-bit Broadcast/Multicast Integrity Protocol Galois Message Authentication Code (BIP-GMAC-256)

    WPA3 Modes

    There are a few modes WPA3 can be implemented

    * WPA3-Personal only* WPA3-Personal transition* WPA3-Enterprise only* WPA3-Enterprise transition* WPA3-Enterprise 192-bit* WPA3 Fast BSS Transition* WPA3-Enterprise Server Certificate Validation


    * Mandatory* AP enables at least AKM suite selector of 00-0F-AC:8 (SAE Authentication)* STA allows at least AKM 00-0F-AC:8 for association* AP and STA must use PMF* AP and STA sets MFPC and MFPR to 1* Must use only DH groups 15-21, group 19* Requirement* AP and STA does not enable AKM 00-0F-AC:2 (WPA2-PSK) and 00-0F-AC:6 (PSK using SHA-256)* AP doesn’t enable WPA on same BSS with WPA3-Personal* No WEP and TKIP on same BSS as WPA3-Personal* STA will use SAE when AP supports SAE and PSK

    WPA3-Personal Transition

    * Mandatory* AP enables at least AKM 00-0F-AC:2 (WPA2-PSK) and 00-0F-AC:8 (WPA3-Personal)* STA allows at least AKM 00-0F-AC:2 (WPA2-PSK) and 00-0F-AC:8* AP sets MFPC to 1, MFPR to 0* STA sets MFPC to 1, MFPR to 0* AP rejects association for SAE if PMF is not negotiated* STA negotiates PMF when associating to AP using SAE* Recommended* AP enables AKM 00-0F-AC:6* STA allows 00-0F-AC:6* Requirement* AP doesn’t enable WPA on same BSS with WPA3-Personal* No WEP and TKIP on same BSS as WPA3-Personal* STA will use SAE when AP supports SAE and PSK

    WPA3-Enterprise Only

    * PMF will be set to capable which is the MFPC bit set to 1 and MFPR bit set to 1 in the RSN Capabilities field* No WPA version 1 enabled on the same BSS on WPA3-Enterprise

    WPA3-Enterprise transition mode

    * WPA2-Enterprise and WPA3-Enterprise transition mode on same BSS, PMF will be set to capable which is the MFPC bit set to 1 and MFPR bit set to 0 in the RSN Capabili...

    • 52 min
    CTS 228: Contact Tracing with Mist

    CTS 228: Contact Tracing with Mist

    In this episode, we had the pleasure to have Sunalini Sankhavaram and Robert Boardman from Mist to talk about Contact Tracing.

    We have recorded this episode in the video format as well so we could demo the solution for you guys. (Thank you Rowell for spending a few hours editing the video!) Here is the video:

    Mist has been integrating location in their APs since the very first one they released. They are able to leverage BLE in order to provide location with a very good accuracy. They are also able to leverage Wi-Fi to provide location. However, location using Wi-Fi is usually not as accurate.

    In this episode, we have approached several topics related to contact tracing:

    * Concept of zones and occupancy (ability to know when too many people are present in a specific are)* How can we leverage contact tracing in the current context (people going back to work after COVID lockdown)* Proximity tracing* Journey mapping (ability to go back and know who was in contact with an infected person)* Technologies used to perform location tracing (BLE, Wi-Fi)* Privacy

    Here are couple of screenshots from our dashboards:


    Here are a few links if you want to learn more about Mist and Contact Tracing:

    * Leveraging the AI-Driven Enterprise to Support Contact Tracing: https://www.mist.com/contact-tracing* Contact Tracing Over Wi-Fi from Packet6: https://www.packet6.com/contact-tracing-wifi/* Wi-Fi DevOps with Mist from SemFio Networks: https://www.semfionetworks.com/wi-fi-devops-mist.html

    • 57 min

Customer Reviews

4.7 out of 5
52 Ratings

52 Ratings

JR-John ,


Very technical and informational, helped me a lot! ^_^👍👍

bryan_dearth ,

The Best by Far!

I’ve been listening to this podcast since September 2018, and I have to say it’s the most enjoyable technical podcast I’ve listened to by far. It’s so good in fact, I’ve gone back and listened to almost all of the old episodes as well. From interviews and current news, 802.11 basics to WiFi 6 deep dives, this one covers all the bases. If you are looking for a way to fill you commute and have a passion for Wireless Engineering, do yourself a favor and give this one a try.

Rowell and Francois, please keep the episodes coming!

ortiz3m ,

Great Podcast for those commuting and wanting to become better Engineers

I've been listening to CTS for the last few months and its so refreshing. Sometimes as engineers we can get into a stride and comfortable. This podcast helped me get out and refocused about learning the ins and outs of 80211. Its so important for wireless engineers to be knowledgeable about our environment and Rowell/Francois help with focused episodes. Whether its the new stuff with ofdma, learning what it takes to be CWNE, or fundamentals of proper RF design, you will learn/refresh alot of information that will make you a better 802.11 engineer!

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