My First Wireless community meet APAC

 

This Blog post just comes out of excitement, Guess who i meet ?

“Keith R. Parsons” founder of  WLPC and  a CWNE.

“Ronald van Kleunen”  Board of advisors for CWNE Certifications and a CWNE himself.

I could keep telling more about what they mean for this WIFI community and how much they have done for the community.

I always wanted to meet them personally and ask my questions regarding the Current Industry Wireless Design goods and bad with Keith and regarding Wireless Security with Ronald.  And I didn’t had to wait for too long , yes i got this chance on 05/05/2017 @ Singapore.

During the day of session 1:

we had a brief discussion about Wireless design practices and  keith shared a little of  his design experiences . Topics including  how the Wireless signal modulation works, whats with Multipath and how does a client behave in relation to those in RF physics and clients NIC cards algorithm and more about the WiFi Designs on real world.

Some notes from the session:

  • Sin, -Sin, Cos, -Cos explanation about how Wi-Fi devices communicate using “Symbols”

        (and SGI – Short Guard Interval = 400ns and non-SGI =  “Long” Guard Interval =          800ns)

  • BPSK (IEEE 802.11 1Mbps, 1-bit per symbol), QPSK (IEEE 802.11 2Mbps, 2-bits per symbol)

and all the way up to 256-QAM (.11ac, 8-bits per symbol).

keith

 

Below is a short video from “KeithRParsons” explaining a bit about how 802.11 modulations, BPSK, QPSK, and QAM work.

https://www.wlanpros.com/resources/different-types-802-11-modulation-schemes-demo-video/

Session 2 of the Day:

My favorite,  Security and Wireless briefed by Ronald it was so much of information than I expected. How much is security important in your Wireless Infrastructure and what if we don’t meet and who are those organization and government body takes care of theses audit. And what if we don’t follow and to what extent the penalty would be.

Topics covered:

*Vendor neutral education

*Secure the Wireless LAN infrastructure

24*x7 Monitoring and Reporting Wireless Security (Automation) using Wireless Intrusion Prevention

*Systems (WIPS) and Mobile Device Management (MDM) Systems

*Regularly do wireless security audits (wireless vulnerability assessments) in the organisation

Later session:

We had a CWNEs round table. CWNEs are really open to guide other WIFI peers and happy sharing the knowledge for the community. They did discuss about their CWNE career and how it is helping them to do their job better.

I have to thank Ronald for organizing this meet and efforts in bring APAC Wireless community together.

CWNEs  onboard / Round table : Keith, Ronald, Ram, Jeffrey, Shuang

Finally this happened, I got lucky on that day and I did receive an Awesome bag in Lucky Draw 🙂

Lastly, WirelessLAN Professionals Badge from Keith Made My Day.

Advertisements

802.11 Wireless frame Aggregation and A-MSDU and A-MPDU in 802.11 N/AC

802.11 Frame Aggregation 

The Frame aggregation was introduced in purpose of reducing the overhead on wireless space and by doing so increasing the efficiency and performance of wireless client. By introducing frame aggregation in the given amount of  Airtime/TXOP the wireless client could now send more data than before.

MSDU-MAC Service Data Unit 

The upper layer information for a MAC layer in 802.11 is called the  MSDU. i.e the stuff [IPheader|TCP-UDP header|Data].

MPDU-MAC Protocol Data Unit

Once there is a header and footer added to the MSDU its now called as MPDU. This is now send to the lower layer called physical layer.

MSDU

Aggregated-MSDU

This is new function added from 802.11N this make it possible to send more data  during the given Transmit opportunity. Collection of MSDU packets is called A-MSDU and then sending them in a single burst through the physical layer.

a-msdu

Aggregated-MPDU:

Again this is new function added from 802.11N and its collection on multiple MPDUs and send them in a single burst through physical layer. You will find multiple mac header and mac checksum inside a A-MPDU.

a-mpdu

Maximum 802.11 Frame Body Size(without encryption)

MSDU: 2304 bytes [standard frame]

MPDU: 2346

MSDU inside A-MPDU: 4065 bytes

A-MSDU: 7955  bytes

802.11AC @11,454

Key points on this discussion:

* 802.11AC the transmission is always aggregated (a-msdu or a-mpdu) even though its a small chunk of data to be transferred and its backward compatible.

*Since the maximum MTU size on a wired network is 1500bytes this is further getting fragmented on wired network (When Jumbo frames disabled on wired).