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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.

0
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0answers
14 views

Cannot change channels on University's WiFi [on hold]

*I'm really sorry if this isn't the place to have a question like this. Since like a week, I've been experiencing extremely poor speed (cannot load even presentations). Speedtest shows 0.5mpbps/...
3
votes
1answer
28 views

Is there any problem with using wifi to continuously signal numerous sensors?

The company I work for is developing a sensor network that will require roughly 1 sensor per every 6 m2 or about 160 sensors for a 10,000 sq ft building. They need to synchronize them by sending a ...
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0answers
10 views

Secure Robotic Mesh Ad-Hoc Networking with Linux [closed]

For a research project, i need to create a mesh network to my robots. I found some long range usb wifi adapters (Alfa AWUS036NHRv2) and hook up to my raspberyy pi 3b+ (i have 4 adapters and 4 rpi3). ...
0
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0answers
14 views

Why might my router and AP (via cat-5) start behaving oddly after several years? [closed]

I am in a low wifi density area, only a few channels ever show activity. To get a good throughput to my garden office, about 120 feet and a few thick brick walls from my router, I have a cat-5 wire to ...
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0answers
30 views

How should I interpret the results of a WiFi site survey? [closed]

I originally posted this question on SuperUser to determine how I might improve the WiFi signal in my house. Since it's been put on hold for being too subjective, and I'd really appreciate an answer ...
0
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1answer
50 views

will wireless devices' MAC address be saved on layer 2 switch?

So I know that basically switches work like this (assuming 2 PCs are connected via Ethernet port) - the switch will store the mapping of the 2 PCs' MAC address and the switch ports in which they ...
3
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3answers
83 views

Does distance of one user from WiFi AP have negative impact on other connected users?

One of my friends (that knows very well Wireless world) told me following: Consider we have high speed AP. If one user stays out of the range of AP WiFi (lets say 51 meter away) - he will have low ...
0
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1answer
122 views

Is a fiber optic connection considered a “wired” connection?

https://en.wikipedia.org/wiki/IEEE_802.3 As Wikipedia says, 802.3 is for ..."wired Ethernet". How can I name copper and fiber networks in one word to describe 802.3 standard and to distinguish from ...
5
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1answer
72 views

Why do we have authentication before association in 802.11

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. Best reason I do get is unlike wired ...
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2answers
48 views

What is the purpose of 802.11 authentication?

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.
1
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1answer
25 views

Authenticating WiFi users with NFC tap points [closed]

I have been looking for a solution to a social WiFi issue at my company. We have poor WiFi authentication for customers in stores, but most of the issues stem from captive portal authentication. My ...
1
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1answer
53 views

Conversion of WLAN traffic to the outside world

Preamble: I don't have that much experience with lower level computer networking yet. I am currently trying to wrap my head around the workings of the WLAN protocol. While I am starting to get the ...
2
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1answer
59 views

Is it possible to use 802.11n to send multicast?

I have tried to set the wifi multicast rates and find that all the multicast packets are send by 80211g, so that the max rate is 54M. Can I use the 80211n to achieve higher rate?
2
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2answers
70 views

802.11X family security protocol identification stage

In what stage (Probing?) in the connection process does the AP "tells" the host it's security protocol? (e.g. "I'm using WEP,WPA etc.) I've sniffed a packet using wireshark but I can't find any ...
2
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2answers
118 views

connection to AP after what stage? 802.11b protocol

I'm seeing several devices trying to connect to an AP (using wireshark), several send and receive the "Probe response" message (802.11) But the don't even send the association request. Why is that? ...
1
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1answer
36 views

Why do I see “ethernet” keyword in my wlan0? [closed]

When I check my wireless network card interface with the command ifconfig wlan0: ether -my-mac-adress- (Ethernet) I just started to learn this stuff, but I thought Wifi and Ethernet are kind of ...
4
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3answers
160 views

Is there any relation between MAC addresses of a dual band (2.4 and 5 GHz) router?

I have a use case where I need to determine whether two MAC addresses belong to the same router with dual band connection 2.4 GHz and 5 GHz. When I did some study, I found that the MAC address of ...
5
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1answer
111 views

DCF and PCF in Wifi-networks

I am studying, trying to learn how DCF (Distributed Coordination Function) and PCF (Point Coordination Function) works as access methods in WiFi, and how they relate to infrastructure vs ad hoc ...
4
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1answer
47 views

Why isn't there packet loss when WiFi scan during packet transmitting?

Android devices perform periodical (about 10s as period) WiFi scanning in the background. Let's say there is a Infrastructure BSS with 2 stations connected, one of the stations, staA, is a Android ...
4
votes
2answers
66 views

How the packet is routed between two host from same sub-net and associated with same AP?

Given host 'A' and 'B' have IP 10.10.0.5 and 10.10.0.8 respectively, the sub-net mask for both are 255.255.255.0, both 'A' and 'B' are associated and connected to the same AP, and the AP is connected ...
1
vote
1answer
56 views

Counting the Number of re-transmission for a single UDP packet transmission in IEEE 802.11?

I was working with a client-server project based on UDP and 802.11 as a link and physical layer. There, the client was trying to probe some packets in the wireless channel to gauge channel condition. ...
7
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2answers
388 views

How is the Groupwise Transient Key used in WiFi networks?

In Wifi WPA, I understand that during association, a 802.11 client and AP negotiate a Pairwise Transient Key (PTK), using which the Groupwise Transient Key(GTK) is provided to the station. I ...
3
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2answers
174 views

Does WiFi broadcast traffic from a station go through the access point?

Let's say I've got two devices connected to my Access Point, a laptop and a tablet. If the laptop sends unicast traffic to the tablet, I understand that it must go through the AP. However, how is ...
-1
votes
1answer
37 views

If I disable the 5GHz radio on my router will it improve my 2.4GHz performance or range? [closed]

I am having an ASUS RT-AC53 dual-band router having 3 antennas. Currently, it is emitting both the 2.4GHz and 5GHz wifi radios. I am just curious if I disable the 5GHz radio will it anyway improve the ...
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1answer
77 views

Dependency between IEEE 802 and OSI model [duplicate]

My question is focussed on IEEE 802.11x for (WLAN) and 802.15.1 (Bluetooth) Wikipedia and other sources underline, that the mentioned IEEE standards just define the PHY and MAC layer from the OSI ...
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3answers
47 views

2x WiFi APs, trying to tune them to work together whilst maintaining throughput

I know very little about WiFi. I know how to measure throughput, I know that 2.4GHz tends to be slower than 5GHz but has a further range. So here's my scenario. I have an office with 1x Aruba IAP-...
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2answers
269 views

Accessing Internet without WIFI or Ethernet

Theoretically, is it possible to access the internet through a browser without connecting to an ethernet cable or using WIFI?
12
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5answers
5k views

Do WiFi and IEEE 802.11 mean the same thing?

I would like to know if WiFi can be generally referred to IEEE 802.11 standard in the context of IoT/machine-to-machine communications or the latter can be referred to as a more general family. I have ...
3
votes
2answers
77 views

Why can't I get a WiFi password by sending out the same SSID?

If I have two WiFi routers in different locations but with the same SSIDs and I connect a device to one of them, when I bring this device near the location of the other router, it will automatically ...
0
votes
1answer
33 views

Signal Strength and Distance

I will be very thankful if you could clarify something to me. Assume I am standing at point A and scanning WiFi around me. My phone records an access point X with a signal strength, let's say -50 ...
1
vote
1answer
39 views

How are 802.11 neighbors communicated to APs?

The 802.11k specifies that an STA can send a "Neighbor Report Request". I understand how the STA sends and gets that from the AP, but how does the AP get this information from other APs? Also, how ...
2
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1answer
233 views

How is collision detected in 802.11n WiFi networks?

IN CSMA/CA, suppose the channel is idle. Two nodes that have been waiting for the same backoff time, start transmitting simultaneously. The nodes detect the collision and double the Contention Window ...
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1answer
55 views

Forcefully wake a sleeping WiFi station - Possible?

As the title suggests... Most WiFi stations enter a sleep/doze state following a short period of inactivity. Is it possible to wake or elicit a response from a device in this state at will by ...
2
votes
1answer
104 views

how to get RSSI information of WiFi users in wireshark?

If I'm able to get 802.11n traffic with my network adapter, would I be able to see the RSSI information? what should be the filter to see it?
1
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0answers
85 views

Why is RTS/CTS optional for IEEE 802.11?

In wikipedia it is stated: Request to Send (RTS) frame: The RTS and CTS frames provide an optional collision reduction scheme for access points with hidden stations. A station sends a RTS frame as ...
2
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2answers
112 views

How does a wireless repeater ascertain the destination MAC address of a wireless client?

While diving into the depths of wireless networks I have come across the different address fields in the MAC header of 802.11 network frames. A few thought experiments later I was confused about a ...
1
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1answer
72 views

Why wait DIFS time before sending in CSMA/CA?

Why wait DIFS time before sending in CSMA/CA
1
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1answer
39 views

SNMP returns strange “bits sent/received” values on a particular port, why?

I have a HP V1910 Switch in my office. I have set up monitoring via SNMP on my local Zabbix server, and everything looks really good on almost all ports (for example, when I use iperf to test ...
1
vote
1answer
44 views

How using a wider channel in wireless medium doubles the data rate?

I am quite confused about how increasing channel width in 802.11 Wireless Networks leads to doubling the data rate. And If that's the case why don't we use 160 MHz wide channel in 5 GHz band?
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0answers
149 views

Wi-Fi airtime utilization

I am reffering to following article http://divdyn.com/wi-fi-throughput/ (paragraph 5). Can someone help me figure out how airtime saturation threshold of 45 Mbps for mix clients of 2/3 (1 SS) and 1/3 ...
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0answers
24 views

Information exposed by the wireless network card interface [closed]

In the 802.11 MAC, there are several parameters at the low-level such as the RTS/CTS threshold, Binary Backoff timers and NAV (Network Allocation Vector) timers to name a few. Is it possible for an ...
1
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0answers
17 views

Does this laptop support 5GHz wifi band [closed]

Does this laptop support 5 GHz wifi band? I googled it and I am confused as it shows both 802.11b and 802.11a. If it supports 5 GHz, why am I not getting it in available wifi connections? I have ...
1
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2answers
185 views

Is CSMA/CA used in Wifi technology?

I understand that these days CSMA/CD i.e. ethernet one isn't used at all because we have full duplex network. Thus, there is no chance of collision here. Also, we don't use hubs anymore. Each switch ...
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0answers
38 views

MAC address not found in BSSID List

I'm trying to connect my device to a router but it fails. While debugging, I found this error message in the logs "MAC address not found in BSSID List" What does it mean? I know that the BSSID is ...
1
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1answer
49 views

Maximum Transmission Unit 802.11ah

What is the MTU of the standard 802.11ah? I didn't find anything in literature and also on the original PDF standard.
2
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1answer
47 views

Is there a way to detect 802.11 devices “pass by” an wifi hotspot?

Is there a way to detect 802.11 devices "pass by" an wifi hotspot. Like if an mobile user there do not connect to the wifi, But has walking by the wifi hotspot.
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0answers
31 views

W-iFi MIMO - Optimized for throughput or Receiver sensitivity (diversity)

How does a Wi-Fi MIMO operation on a smartphone select between maximizing for WiFi throughput or optimized for receiver sensitivity (range)? Is this determined by a configuration in a Wi-Fi MIMO ...
1
vote
1answer
137 views

When does a node send its RTS frame after CTS?

CTS frame contains duration for sending of a node which requests it. And after the node sends the whole frame without collision, the AP broadcasts ACK frame. Then when does another node sends its RTS ...
3
votes
1answer
54 views

Understanding some internals of networking

Let's suppose that my computer is connected to WIFI and also computer of my collegue is connected to the same WIFI. Now, I change my IP address on WIFI interface (using ifconfig) to the same as my ...
3
votes
1answer
121 views

What does “convergence” mean in context of mesh networking protocols?

I am reading about mesh networking protocols like BATMAN and OLSR, and I keep coming across the term "convergence". For instance, in this page from the BATMAN docs, there is a section called "...