Questions tagged [ieee-802.11]

For questions about the IEEE 802.11 series of protocols, also known as Wi-Fi. This tag should be used when asking about enterprise or corporate Wi-Fi networking questions. Questions about home wireless networks are off topic.

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CISCO ISE Identity Management Group assignment

The Scenario in Brief Three types of devices can exist on our wireless networks: AD joined, corporate owned (Windows PC/Laptop/Surface) Non-AD Joined, corporate owned (iPad/Chromebook and their ...
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28 views

Mixing 802.11 channel widths

I don't want to dive too deep into Apple's approach to 802.11 other than to say it's what sparked this question. Apple's CoreWLAN setWLANChannel() method allows macOS application to set the NIC wifi ...
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Default Username and password for motorola rfs6000 after factory reset

I have factory reset my Motorola rfs6000 by using >cli Username: restore Password: restoreDefaultPassword Which then asked me if i wanted to wipe the device etc etc. But then after doing this, it ...
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57 views

Does Wireshark capture all Wi-Fi traffic under the same access point even with WPA encryption?

I know that free unencrypted-Wi-Fi is dangerous since all the traffic in the same AP is visible. Does Wireshark capture all Wi-Fi traffic under the same access point even with WPA encryption?
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How do DCF and MACAW solve the exposed node problem?

With DCF, apparently if Station B sends an RTS to station A, then C delays for NAV(RTS) but cancels if it doesn't detect a CTS. If this were the case it could then sense for DIFS but detect data from ...
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132 views

What actually is EIFS?

There are a couple of things on the Internet about EIFS intervals. One way I've found to help people understand EIFS is the following: When a station receives a corrupted frame, it has no way of ...
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98 views

802.11 Management Frame element decoding

An IEEE 802.11 Management Frame can contain multiple "Element" fields, which are effectively TLVs (a Type, a Length, and a Value). Other than Type 211 for "Vendor Specific", are there any Element IDs ...
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40 views

Optimize Network For UDP Broadcast Traffic?

I have a computer that creates an AP which multiple microcontrollers connect to. The computer sends out UDP Broadcast packets that tell the microcontrollers to do different things. I have an issue ...
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1answer
73 views

Difference between standards, protocols and working groups?

I am trying to understand the meaning of standards, protocols and working groups. I read that the 802.11 of the IEEE organization is a working group, trying to implement some standards. I think that I ...
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39 views

How long communication timeout can be expected from a 802.11 infrastructure?

Imagine a client device ("station" in the wifi terminology) with an authenticated, living connection to a 802.11 infrastructure. The APs are expected to follow the relevant standards. Then, the ...
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360 views

What is difference between WMM-PS, Power Save Poll, Power Save non-Poll, Unscheduled Automatic Power Save Delivery (U-APSD)?

I am study on Power Save Mechanisms. Could you please show me what is difference between WMM-PS, Power Save Poll, Power Save non-Poll, Unscheduled Automatic Power Save Delivery (U-APSD)? and how to ...
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361 views

How to check the MIMO power save state in a WiFi Beacon frame?

I'm testing one WiFi Gateway where the toggle option for MIMO power save mode need to be tested.I'm capturing the WiFi beacon frames using sniffer but I'm not able to find out which information ...
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1answer
32 views

Unwanted Wireshark Optimizing Received 802.11 Channel for Frames

I am trying to run an experiment which involves monitoring 3 wireless channels simultaneously in Wireshark which would allow me to see a single frame captured 3 times on each channel. To do this, I ...
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For DCF (Distributed coordination function) based WLANs, in what scenario can cause frame collisions?

I am studying network communication and get confused about this concept. Since I know DCF has the backoff scheme for frame transmission and will sense the channel status before start transmit data. So ...
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26 views

How to determine which Wifi channel offers the least interference?

I'm trying to set up a roaming wireless network. For this, I have tried to analyze the area of coverage for any external network interference. I do know that networks can change over time and Wifi ...
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20 views

How is it possible that CSMA/CA works in areas with a lot of users within a small radius (e.g. rallies, concerts, etc.)?

My understanding of CSMA/CA is that devices listen until a Wi-Fi channel is idle before sending packets. If a collision still happens, then the devices waits a random interval before attempting to ...
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115 views

802.11s versus IBSS mesh (with layer 3 routing protocol)

I just learned that you can create a Wi-Fi mesh network either with the "native Wi-Fi mesh standard" 802.11s, or by putting all devices of the network in the IBSS mode and run a layer-3 mesh ...
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16 views

Implementation of CSMA/CA between orthogonal channels?

In CSMA/CA, it is well known that hosts are not transmitting if they are detecting a signal. However, is it true that in 802.11ac, a host won't wait even if it detects a signal of an orthogonal ...
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21 views

How many time can a Block Acknowledgement Request can be sent if no BA is received, in 802.11 networks?

If we consider a 802.11 ac network, how many time, at most, can a Block Acknowledgement Request be retransmitted if it is not received at first? I'm running simulations in the ns-3 simulator, and I ...
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70 views

If two Wi-Fi access points share the same BSSID, does it mean that they work on the same channel?

It is my understanding that if an ESSID is used by several sets of APs on several channels (let's say one AP = one channel only), then two APs sharing a BSSID should also share their radio ...
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47 views

Reason for congestion in CSMA based networks

A typical channel with SNR 10dB and BW 10 MHz will have a channel capacity of something around 150 Mbps. In CSMA, at any given time, only 1 user is allowed to transmit and in 802.11p, the default ...
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102 views

Set up multiple WAP4410N AP with same SSID

We are facing a WiFi connection issue in the prod environment at client place (a big hall, around 200ft x 150ft). Details: Environment: 4 Cisco WAP4410N Access points mounted on the pillars in the ...
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69 views

Why wifi and ethernet use the same frame format from tcpdump -d output?

If I execute tcpdump -i wlan0 tcp -d or tcpdump -i eth0 tcp -d I get the same output (000) ldh [12] (001) jeq #0x86dd jt 2 jf 7 (002) ldb [20] (003) jeq #0x6 ...
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1answer
48 views

Is the auto-correlation of a frame transient based on the physical characteristics of a device?

I am currently studying ways to fingerprint Wi-Fi devices based on their physical characteristics and I was struck by a question after reading Section B of this paper http://www.ccs-labs.org/bib/...