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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17 views

Which WiFi 802.11b interference is more destructive? [on hold]

I am curious after using 'WiFi Analyser' App on Android phone. The App shows various AP's that are in the range of your cell phone over the Wireless LAN. It shows APs SS-IDs , their channel number ...
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2answers
29 views

Wifi antenna to detect clients

I would like to know if it is technically possibile to detect and recognize a client (PC/smartphone) during its wifi scan. My goal is to get the list with identifiar like mac address or other unique ...
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49 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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113 views

Wireless Multipoint Bridging / Backhaul Gateway Antenna and AP Selection

My company is replacing an old wireless bridging system with new 802.11ac gear. Layout is a central building with 4 remote buildings within 180 degrees line of sight. Bridging only. I think that I ...
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1answer
80 views

Capturing Wireless Network Packets

See below link that I was unable to comment. Sorry for the dupe but I have tried hard to get a satisfactory answer to this question. Upon reading the WS docs and others, I am led to believe that I can ...
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36 views

4x4 802.11ac 5 GHz WLAN

Reading the tech specs of WIFI devices (see here as an example) phrases as this one appears: Supports 4x4 802.11ac 5 GHz WLAN interface with multi-user multiple input, multiple output (MU-MIMO) I do ...
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1answer
15 views

How wifi solve medium access (Distributed Co-ordination Function) in overlapped channels

My locality has 11 Access points and as per wifi specification only 11 channels are available which are overlapped. Assuming all 11 Access points working on these 11 overlapped channels (each at one ...
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1answer
36 views

RV260W as Access Point

We recently upgraded to a proper firewall, with some help from this community, and are now looking to repurpose our RV260w as a wireless access point. I tried already, but I was trying to use the WAN ...
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22 views

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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36 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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21 views

Why is there no contention window after a DIFS interval on the first transmission in diagrams?

Why, at the start of every diagram representing DCF is there no contention window and it just senses the channel for DIFS before sending RTS? Every other station that has waited for NAV must sense for ...
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56 views

How does Kismet find WIRED devices when scanning Wi-Fi? [closed]

In an effort to better secure my Wi-Fi network by finding its weaknesses and mitigating them, I have employed the use of Kismet, a well known Wi-Fi security scanning tool. When I use Kismet to scan ...
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1answer
51 views

Using Wi-Fi sensing, could I distinguish directions of moving objects based on time of flights? [closed]

I would like to distinguish the directions of a moving object using Wi-Fi sensing, in an arrangement like this diagram: In my assumption, 1) set up two scanner: A (0, 0, 5) and B (3, 3, 2) 2) there ...
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1answer
48 views

When is the HT Capability section in a probe request packet undefined?

I'm analyzing probe request packets and I'm seeing that some of them has an undefined values in HT Capabilities section. Why? Is it not required in all probe request packets?
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1answer
76 views

Does IEEE 802.11 allow soft-combining?

Out of purely theoretical curiosity, I was wondering whether the IEEE specification for WIFI allows for ARQ with soft-combining. I found a number of publications describing the benefits of soft-...
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1answer
124 views

What is max speed of WiFi Direct (P2P)?

I'm looking for information on what kind of speeds theoretically can devices connected through WiFI Direct achieve, assuming all devices support WiFi ac?
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76 views

Ad hoc vs Mesh, which one to use?

Say we have four nodes (A, B, C, D) that are arranged in a chain-like topology. A <-------> B <-------> C <-------> D Only the adjacent nodes are in range of one another (A can ...
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1answer
42 views

How to extract transfer rates from a beacon frame (or WLAN_BSS_ENTRY)?

How can I extract the transfer rates (actually I only need the maximum value) from a WLAN_BSS_ENTRY structure (obtained by WlanGetNetworkBssList)? The value wlanRateSet (WLAN_RATE_SET) seems pretty ...
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1answer
378 views

What does MTU depend on?

I'm trying to understand what factors determine the MTU. For instance, why 802.11 has MTU of 2304 while Ethernet MTU of 1500? Are there restrictions of the physical medium or arbitrary design ...
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1answer
36 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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1answer
131 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 ...
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3answers
87 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 ...
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1answer
130 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 ...
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1answer
168 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
65 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.
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1answer
41 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 ...
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1answer
54 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 ...
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1answer
174 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?
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158 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 ...
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150 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? ...
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1answer
74 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 ...
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3answers
579 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 ...
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1answer
387 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 ...
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56 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 ...
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2answers
69 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 ...
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1answer
59 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. ...
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415 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 ...
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2answers
357 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 ...
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39 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
263 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
52 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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422 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?
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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 ...
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2answers
84 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 ...
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1answer
37 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 ...
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44 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 ...
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1answer
707 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
74 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 ...
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1answer
188 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?
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2answers
179 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 ...