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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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5
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3answers
4k 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 ...
7
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1answer
1k 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 ...
2
votes
3answers
104 views

When replacing an 802.11a/b/g WAP with an 802.11a/b/g/n/ac WAP, is there any reason to change the SSID?

When replacing an 802.11a/b/g WAP with an 802.11a/b/g/n/ac WAP (on a network with a single WAP), is there any technical reason to change the Wi-Fi SSID? If the SSID (and password) stay the same, ...
2
votes
2answers
154 views

Routing packets in 802.11 (Wi-Fi)

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
votes
4answers
168 views

Detecting same local area network

Would it be possible from a central server, communicating with two clients {A, B}, to determine if A and B are physically located on the same local network? 1) Local/Home Networks I'd say sure. The ...
2
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2answers
191 views

Building New Network and Need fast connection to central database between 20 wired and 20 wireless devices

I'm planning the network for my company's new office space. I'm not an expert so I'd like to present my plan and ask y'all nice folk to tell me if and where I'm making mistakes. Assumptions: Office ...
1
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2answers
2k views

How do devices communicate over a WiFi network?

What "protocol" services like Sonos or Chromecast use to communicate between devices over the same WiFi? In particualr, how do those devices make themselves discoverable and how do they "fish" for ...
5
votes
3answers
651 views

Is it possible to build a LAN with just Access Points?

I am just learning the differences between routers and AP. Based on what I have understood, AP just acts like a wireless switch enabling multiple devices to connect to a single router. Since it is ...
2
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1answer
50 views

How does a wireless adapter know which signals are intended for it, rather than another nearby device?

(Let me know if you think this question fits the EE site better.) If I'm on a Wi-Fi network using my laptop, and someone else is nearby on a laptop, also using the Wi-Fi, how do our respective ...
3
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1answer
102 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 ...
7
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2answers
136 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
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1answer
130 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. ...
1
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2answers
4k views

How can wind affect my Wi Fi signal?

I live next to a university campus. Sometimes I get a nice strong Wi Fi signal. Sometimes I don't get anything. It all depends on the wind direction. How is it possible for wind to affect electro ...
2
votes
2answers
150 views

How does the encrypted Wi-Fi protocols relate to ethernet?

More exactly: Which protocol is embedded into which? The relevant Wiki page describes only the protocol, but not its relation to the ethernet. It isn't even made clear if it uses embedded ethernet ...
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4answers
3k views

Raw-Ethernet Frames

Recently I was puzzled by the following articles about Raw-Ethernet frames: RAW ethernet vs. UDP Message Passing Using Raw Ethernet Frames Briefly, both of them discusses that it is possible to ...
7
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2answers
608 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
1k 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 ...
0
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1answer
126 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 ...
1
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3answers
89 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-...
0
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1answer
990 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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2answers
977 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?
14
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5answers
9k 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
444 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 ...
1
vote
1answer
122 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 ...
1
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1answer
112 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
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1answer
58 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
votes
2answers
1k 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 ...
3
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1answer
2k 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 ...
6
votes
1answer
6k views

Why doesnt Bluetooth Low Energy interfere with Wifi

so the BLE advertising channels are located at 2402Mhz, 2426Mhz and 2480Mhz. That is so it does not interfere with the 3 wifi channels in the 2.4Ghz band. My question is especially about the 2426Mhz ...
2
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1answer
270 views

802.11 Power Save (Doze mode) ~~ AssociationID in TIM field triggers STA wake up?

I have been reading multiple sources regarding STAs PS mode and they all end up saying that the STA is responsible to wake up at preconfigured (during association) Listen Intervals to check the AP's ...
2
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1answer
395 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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1answer
319 views

Why wait DIFS time before sending in CSMA/CA?

Why wait DIFS time before sending in CSMA/CA
2
votes
2answers
239 views

How to create a network with many access points or repeaters and guest access

I have an existing simple network with internet connectivity. We have four access points that do not offer true guest access. We would like to have four access points that offer wireless for the ...
1
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1answer
195 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 ...
2
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1answer
55 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
32 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 ...
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0answers
26 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 ...
3
votes
1answer
87 views

Total data length transfered in 802.11 using Wireshark

How could I get the total size of a some data that has been transfered using UDP over a wireless channel from a Wireshark capture trace ? I have read somewhere that the sender advertise the total size ...
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2answers
3k 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 ...
2
votes
1answer
70 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.
1
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1answer
2k views

(Cisco/Apple) 802.11r Handoffs Failing: 802.11r Key Cache look up failed in (re)-assoc req

I am trying to set up a wireless LAN using two Cisco 3602i APs on a Virtual WLC running software version 8.2.160.0. My goal is to have an iPhone 6s using Voice-over-WiFi be able to fast-roam between ...
1
vote
1answer
274 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
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1answer
55 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
2answers
704 views

Antenna orientation on a 4x4 MIMO capable access point

A general rule of thumb for a 3x3 MIMO system antenna orientation is: Keep the center antenna upright at 90 degrees Keep the outward antennas leaned outwards at 45 degrees I was wondering what ...
1
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2answers
236 views

Method in wireshark to filter for any in a set of mac addresses but no others

I am sniffing for several devices in a congested environment. I'm wondering if there is an easy way to accomplish filtering that I don't know of. I have two APs that things are connecting to so I ...
3
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1answer
192 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 "...
3
votes
2answers
350 views

Guest WI-FI implementation - HP switch (comware) and Brocade/Motorola AP 7131

I have been asked to add a guest Wi-Fi network to our existing Wi-Fi network. We have an HP switch (Comware) v1910 and Brocade/Motorola AP 7131. We have created an untrusted interface on the ...
2
votes
1answer
514 views

Probe Request Channel Information

I have used wireshark to capture Wi-fi frames, and have configured my AP to operate on Channel 1. Now in one of the transactions that occur, I find my mobile device sending a probe request in the ...
1
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1answer
101 views

Testing MCS Index Rates

my question might be a little too "newbie" style, but.. How can MCS index rates be set/restricted? For example, is it possible to set the MCS index to 5 at 20 Mhz bandwidth with 64-QAM Modulation and ...
2
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1answer
3k views

How does an AP acquire channel via RTS/CTS in IEEE80211ac?

There is one thing I do not understand in this IEEE 80211ac MU-MIMO specification and it concerns the way an Access Point can safely acquire channel via RTS/CTS mechanism before sending multiple ...

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