A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

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.

Filter by
Sorted by
Tagged with
0
votes
0answers
12 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 ...
1
vote
0answers
41 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?
1
vote
4answers
66 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 ...
0
votes
1answer
35 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 ...
1
vote
0answers
20 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 ...
0
votes
1answer
57 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 ...
1
vote
1answer
33 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 ...
0
votes
0answers
29 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
votes
1answer
103 views

meraki bridge mode: dhcp is untagged

We have the following set-up: +------+ +--------+ +--------+ |Router|-----| switch |-----| Meraki | +------+ +--------+ +--------+ | +---------+ ...
2
votes
1answer
111 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 ...
1
vote
1answer
77 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 ?
0
votes
2answers
54 views

Do all computers on a wifi network have the same Network ID in their IP address?

I'm trying to clear something up that I haven't been able to get a simple answer to. If I have multiple computers on the same wifi network, is it correct that they will have the same network ID, but ...
2
votes
1answer
51 views

Why do wifi devices slow down as other devices start doing work?

I've been doing some testing lately on 802.11g and I'm very confused by the results. I'll go into the details below. First please understand I'm a software developer, but not a network engineer. I ...
1
vote
1answer
41 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?
0
votes
1answer
59 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 ...
0
votes
2answers
59 views

Can / Is CSMA/CA used in wired network?

I learnt why CSMA/CD cannot be used in wireless protocols here. Here is what the answer says: Wireless transceivers can't send and receive on the same channel at the same time, so they can't detect ...
0
votes
1answer
122 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 ...
0
votes
1answer
94 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
vote
2answers
63 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 ...
1
vote
2answers
48 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
1
vote
2answers
103 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
votes
1answer
43 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 ...
0
votes
1answer
24 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
vote
2answers
73 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?
1
vote
1answer
39 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....
0
votes
0answers
54 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
votes
1answer
87 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
votes
0answers
40 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
votes
3answers
43 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 ...
0
votes
4answers
90 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 ...
3
votes
2answers
122 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
votes
1answer
89 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 ...
3
votes
2answers
75 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
votes
1answer
25 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
67 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
votes
0answers
41 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
votes
0answers
68 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 ...
2
votes
1answer
63 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
votes
1answer
176 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
vote
1answer
56 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 ...
1
vote
1answer
89 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?
3
votes
1answer
112 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
201 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?
2
votes
0answers
130 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 ...
0
votes
1answer
56 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 ...
3
votes
1answer
423 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 ...
4
votes
1answer
40 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 ...
0
votes
1answer
311 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
votes
3answers
97 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
votes
1answer
141 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 ...