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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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1answer
125 views

Meraki AP reboot?

Does Meraki WiFi Access Points reboot after 4 Hours of not getting reach-ability with Cloud Controller?
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2answers
52 views

Reconciling multiple definitions of Bandwidth

I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could find are: difference between the upper and lower frequencies in ...
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1answer
31 views

Could 802.11ax devices still get benefits from OFDMA if there is unsupported 802.11ax devices?

As far as I know, 802.11ax supported OFDMA modulation, which can separate different amount of sub-carriers to each device in each time slot. I want to figure out if there is unsupported 802.11ax ...
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1answer
76 views

How many 160Mhz channels can 801.11ax support? [closed]

With an 801.11ax WLAN, how many simultaneous connections could be made using 160Mhz wide channels?
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1answer
86 views

Is MIMO equivalent to link aggregation?

Is MIMO the wireless version of link aggregation in wired networks? I'm not asking if MIMO is a similar link aggregation protocol like LACP or PAgP, what I'm asking is if it is the same concept as ...
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2answers
43 views

Can computers connected within a Network via Ethernet monitor access the information uploaded/downloaded on a different computer

Suppose there are many computers connected within a Network. Let's take 2 examples. Computer A and Computer B, connected within the same network. Suppose, At the start of the day, say myself as an ...
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1answer
86 views

How does DHCP over WiFi work?

Specifically - does the AP that the client is authenticated with mediate the communication between client and the DHCP server when the client first joins the network, or does the client talk directly ...
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1answer
20 views

What role Wifi Password play in the connection with the AP?

I was trying to study about how my device connect to the AP via Wifi. I saw many concepts like WPA,WPA2,MIC, 4 Way Handshake and much more. I studied all of them but I still cant understand where in ...
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1answer
63 views

Is mesh possible on fully wired AP-AP communication?

I am thinking on the implementation of a Wifi mesh, with the restriction that all AP-AP communication, including routing/bridging, should happen on ethernet. The reasons, why the lack of radio-based ...
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1answer
34 views

Does CSMA/CA have anti-DoS measures, and if yes which?

So as far as i understand, you can deny other devices access to a WiFi by flooding the channel they are on with data, so that the channel is never "idle", thus preventing other devices from using it - ...
4
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1answer
791 views

WPA2 Enterprise with NPS and WLC

I am pretty new to this and am trying to set up WPA2 enterprise where users can connect to the Wifi using their AD credentials (PEAP-MSCHAPv2). The Cisco WLC has been configured to relay requests ...
0
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1answer
35 views

Direct connection betwen two Ethernet-to-wifi adapters [closed]

I currently have two computers connected via ethernet and a switch, using static ip-addresses. I would like to connect a third computer, this time wirelessly. And I am wondering whether the setup in ...
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1answer
199 views

How does a 802.11 (wifi) frame identify the payload's layer 3 protocol?

My understanding is that the 802.11 frame header is an equivalent of ether header. In the ether header, there is an EtherType field that identifies the payload protocol, such as IPv4/IPv6/ARP etc. ...
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1answer
53 views

How does SISO and SU-MIMO serve multiple clients?

I am new to wireless. From what I read, SISO serves only 1 client at a time and SU-MIMO can serve multiple clients but at different times. So does SISO and SU-MIMO serve 1 client and then wait until ...
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2answers
73 views

Is there packet loss in WLAN?

What happens if 2 end devices connect to the same AP and they wanted to exchange data (without connecting to the internet), but 1 device has a strong signal and the other has a weak signal? Is there ...
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2answers
626 views

Motorola RFS4000 - After Reset I Can't Log In

I started to use Motorola RFS4000 with wing 5.7 on board. After few weeks I had to reset test configuration. After hard reset using reset button I don't have access to this device any more. None of ...
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1answer
18 views

I can't decide what to buy for fixing my wifi signal [closed]

I have a broadband 2.4Ghz modem, and I'm facing signal issues. Will it be sorted out if I buy a 5Ghz wifi repeater and connect it to the 2.4Ghz modem? Or do I need to buy something different? I ...
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1answer
44 views

Reccomended set up for wifi in dense apartment block? [closed]

I live in an apartment block of 87 units & one thing most people in it complain about is the poor cellular data reception. I have an idea of installing a fast wifi internet connection ...
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1answer
28 views

Does the Duration Field in 802.11 Depend on SNR

I am trying to understand the behavior of the Duration/ID field in 802.11 specs. Its role and behavior are outlined in the standard. This field tells other stations how long the transmitter is going ...
2
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1answer
154 views

Wireshark not showing Frequency/Channel

I am using Ubuntu 18, and wireshark-gtk. I followed this and this tutorials to create a column named/showing frequency/channel. But all the packets I captured have no frequency/channel showing.I tried ...
2
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1answer
51 views

in 802.11, when must a station go to the “random fall back slot” mechanism?

i've been reading Michael Gast's 2005 book on 802.11, and he talks about how each station, after it has seized a channel and finished transmitting, will then have its NAV timer expire (along with all ...
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1answer
86 views

Can the regulatory domain be configured on Cisco WAP571 devices?

I got 3 WAP571 and 2 WAP571E (outdoor AP). According to specs, all 5 AP's should work in a Single Point Management and allow seamless roaming. Yet, the two types of AP's do not speak to each other. My ...
2
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1answer
103 views

Are there other protocols for enforcing AAA besides RADIUS?

I know this is not the ideal question format but I need to lean upon the expertise in this community. I am looking for a simpler method of implementing AAA (Authentication, Authorization and ...
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1answer
47 views

IPv4 Subnetting for 1200 or more devices for WiFi

I am currently looking over my schools existing Subnets and their usage. Some seem to be sufficent, others not so much. What is the best practice when you need to support 1200 or more devices on a ...
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0answers
21 views

How can I block the Internet and mobile data fallback? [closed]

Hoping to block outgoing WAN access from my network during certain periods as well as stopping mobile devices from auto-failing-over to their mobile data. Of course this won't be perfect since devices ...
2
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0answers
56 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?
2
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1answer
71 views

Is there a way to prioritize/manage WIFI traffic (in the WIFI realm)?

So I have a WIFI/client application which has some specific issues, in that several devices need to absolute priority. Fortunately, i'm able to prevent MOST devices from joining the network, but I ...
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4answers
358 views

How 802.11 LAN will avoid packet collision in a wireless medium?

Say we have a router (capable of the 802.11 protocol standards) and some number of devices that are configured to communicate with this router. I have learnt about how devices/nodes use CSMA/CA to ...
2
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1answer
868 views

Do two computers in the same wifi LAN communicate directly without the router? [duplicate]

I have heard (forget where) that in a local wifi network created by a router, when two computers communicate with each other, they communicate directly with each other, and their communication doesn't ...
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2answers
93 views

What is the purpose of 802.11 authentication? [duplicate]

Why does client authenticate before associating with the AP. What does open system authentication even achieve. I fail get an accurate reason from my web searches.
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1answer
289 views

AP won't join WLC

I have a lightweight AP AIR-AP3802I-E-K9 that I'm trying to connect to my WLC, but it just won't. When I run a debug on the WLC, I can see the Join request from my AP, and I can see my WLC sending a ...
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0answers
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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4answers
158 views

How can we troubleshoot Wifi problems apart from the basic tips?

We have a Zyxel Wifi with an NXC2500 and two WAC6503D-S access points in our office. Around 30 devices are connected. We have both a 2,4GHz and a 5GHz radio active, both on channels without known ...
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1answer
79 views

Can 2 Wi-Fi adapters work with a single antenna?

I have a panel Wi-Fi antenna and an adapter for it. These 2 work flawlessly together. But also I would like to connect to somewhere else without buying another huge antenna. Is it possible if these 2 ...
4
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1answer
615 views

General questions about RSSI for wireless devices

Received Signal Strength Indicator (RSSI) is a measure of the received signal power at the antenna and is usually a negative number expressed in dbm for IEEE 802.11 devices. My questions are: Does ...
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1answer
168 views

How to determine BSSID from MAC Address

As I know BSSID is derived from MAC Address, but I have no idea how it is derived and what pattern is used. Since there might be multiple BSSIDs from a device, I want to get all the BSSID that could ...
3
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2answers
1k views

I know Wi-Fi, but what on earth is Wi-Fi__33?

Thank you for reviewing my question. I am researching "Wi-Fi__33". It's a real thing. I see it mentioned in places such as http://www.logisticsit.com/blog/2017/02/07/three-retail-tech-trends-to-watch-...
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0answers
46 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 ...
2
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1answer
150 views

How does MU-MIMO allow multiple users to talk at the same time avoiding collisions?

In a wireless network, a collision is a situation that occurs when two or more devices attempt to send a signal along the same transmission channel at the same time. To avoid collisions we use CSMA/CA ...
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1answer
2k views

Difference between 802.1X vs 802.11 standards

What does the x means in 802.1x and which are the differences between the 802.1X and 802.11 standards ? Can you explain to me ?
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1answer
70 views

Is there any fixed version of CSMA/CA?

I was trying to understand exact algorithm for Carrier Sense Multiple Access / Collision Avoidance mechanism from Forouzan's book. The book gives very detail explanation of topics. However explanation ...
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1answer
148 views

ARPs in WIFI Interface Monitor Mode

I set my WIFI interface to monitor mode. I did not expect to see any ARP requests. Can someone explain why there is ARP traffic?
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3answers
3k views

How does access point changing populate MAC addresses in switch tables?

Let us assume that I have a large corporate WLAN network with many access points having the same SSID. The WLAN access points are connected to each other by learning Ethernet switches. Now, each ...
0
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1answer
489 views

UDP in wifi getting excessively buffered [closed]

We are using a wifi-enabled device that receives a stream of UDP packets (30 per second). It is very important for us to receive these messages without lag, that's why we are using UDP and not TCP ...
1
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2answers
72 views

Different Wi-Fi security levels under same private subnet

I'm working on an assignment and I'm given a hypothetical scenario where: A company has a local subnet where everything shares the flat address space 192.168.0.0/8 (this means that any device can ...
4
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1answer
15k views

Why would a WiFi extender use the same channel as the primary AP?

I'm trying to set up a simple "wall wart" WiFi extender, a DLink DAP-1520. The setup is straight forward enough, but there seems to be no option for choosing a channel/frequency, so the extender will ...
1
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2answers
120 views

Airtime efficiency

How is airtime efficiency measured? How does one increase it, decrease power consumption, and minimize the amount of RF transmitted? cf. these comments
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2answers
848 views

Is it really necessary for APs to constantly send beacon frames (always be in “discovery mode”)?

Why do wireless APs constantly transmit (e.g., with a beacon interval of 10×/sec.), even when no devices are connected to them? Doesn't that just cause needless RFI? Is it really necessary to ...
0
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1answer
51 views

Setting all switchports as tagged for 200 x VLANs?

question: should I expect any performance hit from enabling 210x tagged VLANs on ALL 24x ports of a switch (or alternatively setting ALL 24x ports as trunk ports) background / equipment: We have a ...
1
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2answers
113 views

Why are there so many more dual-band (2.4 & 5 GHz) Wi-Fi APs than single-band, 5GHz-only ones?

Why are so many more dual band (802.11n 2.4GHz & 802.11ac 5 GHz) APs than single-band, 5GHz-only ones? Is this for backwards compatibility?

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