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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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2
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1answer
120 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 ...
0
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1answer
29 views

Does WIFI allow an AP to probe clients? Even ones not connected?

I am aware that clients can send probe requests to find hidden SSID APs. Also, I've seen that clients can send probe-any requests with NULL SSID lists, to see all APs within range. However, can APs ...
1
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1answer
116 views

Hide SSID to block probe requests from clients

According to this Answer clients are sending probe requests to discover wifi networks. If I hide the SSID the AP wouldn't need to handle these probe requests and therefore the workload would be lower....
7
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1answer
807 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 ...
0
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0answers
90 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 ...
2
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1answer
231 views

Restructuring office network advice and How to go about VLAN setup?

Wanted to get some advice and assurance that I’m on the right track for re-configuring our office network. Current setup: FortiGate100D with 2 physical network interfaces, network-1 used for regular ...
0
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0answers
67 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 ...
0
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3answers
51 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 ...
2
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0answers
73 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 ...
2
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0answers
255 views

Ad hoc vs Mesh, which one to use? [closed]

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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2answers
201 views

Why can't i see wireless traffic not addressed to my wireless interface with wireshark

I'm using Wireshark to capture traffic on my 2.4G wifi network. I'm set to promiscuous mode, but I only see traffic to or from me, or broadcast or multicast traffic. Unless I'm remembering ...
3
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2answers
129 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 ...
0
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1answer
93 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 ...
4
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5answers
34k views

Finding out which wifi AP the device used to access the network

Is it possible to find out the MAC Addr of AP the device used to connect the network? I can get the MAC address and IP address of the device(maybe notebook or smartphone), and I have to check the MAC ...
3
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2answers
1k 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 ...
2
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1answer
29 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 ...
2
votes
1answer
133 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 ...
2
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0answers
126 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 ...
1
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1answer
642 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 ...
1
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1answer
66 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 ...
5
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2answers
2k 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 ...
1
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1answer
162 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?
19
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2answers
6k views

Can a probe request be answered on a different channel?

I am monitoring the 802.11 traffic in my network, and especially the active probing from my smartphone. I am sending Probe Requests for certain hidden SSIDs, but also an Undirected Probe Request, ...
3
votes
1answer
290 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-...
2
votes
1answer
534 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?
0
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1answer
84 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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5answers
3k views

Difference between Frame and packets in IEEE 802.11

I am new here and hope I can get some help! Recently I have been learning the Physical Layer PHY specifications of IEEE.802.11 i.e the WLAN standards. A tutorial I have used defines the general PHY ...
3
votes
1answer
556 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 ...
1
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1answer
516 views

wifi access points in a noisy environment

I have a bunch of Cisco AIR AP 1602e, which I have configured. These are dual-band a/b/g/n access points. Sometimes my users do expirience lags and spikes, even the associations start to break (for ...
4
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1answer
50 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 ...
4
votes
1answer
1k views

Is Wifi a broadcast medium?

If wifi/wlan is broadcast medium, can we tap the wifi traffic by just placing our wlan0 into promiscuous mode?. In this way, can we get the source ip and destination ip of the traffic generated by ...
1
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1answer
541 views

How can i learn uptime of Access Point?

I have a pcap file containing 802.11 traffic. How can i learn from this pcap file what is the uptime of any Access Point? There is a field named TimeStamp, is this field important for me?
0
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1answer
624 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 ...
4
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3answers
104 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
165 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 ...
2
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2answers
88 views

Strengthening Wi-Fi signal

The company has a Wi-Fi network, and the company area is quite large. There is a dead zone in which the Internet is not available by client devices (about 30% of the total area). There were attempts ...
1
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1answer
848 views

How data flow via APs with a controller?

Network topology: I saw a tutorial video which teaches me to build a wireless network like the image above. And he said he used two VLANs: One is for APs and controller and management. The other is ...
2
votes
3answers
1k views

Max bandwidth of wireless access point with gigabit backhaul

I'm looking at setting up a network with full WiFi coverage. Right now I'm still comparing access points to mesh. I see the options for AC access points offer wireless bandwidth in excess of 1Gbps. ...
1
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1answer
105 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 ...
2
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2answers
292 views

Why do the majority of probe requests captured have an invalid OUI in their MAC address?

I'm working on replicating some research wherein users were profiled based on the SSIDs they asked for when sending out 802.11 probe requests. I only captured probe requests, so information from ...
2
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1answer
3k views

Relation between Ethernet and 802.11 headers

I would like to ask about the relation between 802.11 and Ethernet L2 Link layer. Are they dependent of each other? Or can they be seen as independent L2 link layers (with only similarities in ...
2
votes
1answer
523 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?
1
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1answer
67 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 ...
1
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1answer
155 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.
3
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1answer
3k views

802.11 how do i find out if packet is encrypted with WEP or WPA

i am playing with the 802.11 header, trying to figure out the encryption type of incoming 0x08(DATA) packets. 1) I capture the 0x08 type packet (DATA). 2) I find out that a WEP bit is set (2nd byte ...
2
votes
1answer
3k views

Is it possible to setup multiple Networks on a single Access Point?

On my quest to understand what AP is and how it works, I came across article that says this: Most often, there are different BSSIDs on an access point for each WLAN configured on a radio. If you ...
2
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1answer
50 views

Question on using random channels for wireless networks

I work at a corporation and we have engineer's who test "in home" settings which requires a wireless router. Such testing doesn't need to extend beyond the desk of the user. Currently we keep track ...
2
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2answers
664 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 ...
3
votes
2answers
300 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? ...
2
votes
1answer
783 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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