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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16 views

How to combine ethernet & wlan [closed]

I've an ethernet connection (8Mbps), and I'm using a mobile hotspot (1Mbps Wifi). On my laptop (Thinkpad - windows 10) I've connected ethernet & connected to mobile hotspot as well. My laptop ...
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10 views

Solution to get a cable connection without passing cables throw the wall [closed]

I have a fiber link comming to my apartment, connecting to the "fiber reader" (i didnt really know the name of that) and connecting to a wifi router. Problem is, my laptop had a crap wifi receiver, ...
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Cannot resolve ARP for device on same wifi network [closed]

Here's a simplified network diagram: +--------------+ | Router | | 192.168.10.1 | | 192.168.5.1 | +-------+------+ | | +-------v--------+ +---------------+ | Switch ...
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So I'm confused on this question for CompTIA A+ [closed]

The website says the answer is "C.", But why would you ever pick WPA over WPA2 for anything like this? Isn't WPA2 more secure? Question 3 A human resources manager requests wireless APs to be set up ...
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1answer
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I can't decide what to buy for fixing my wifi signal [closed]

I have a broadband 2.4Ghz modem, and I'm facing signal issues. Will it be sorted out if I buy a 5Ghz wifi repeater and connect it to the 2.4Ghz modem? Or do I need to buy something different? I ...
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30 views

Reccomended set up for wifi in dense apartment block?

I live in an apartment block of 87 units & one thing most people in it complain about is the poor cellular data reception. I have an idea of installing a fast wifi internet connection ...
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1answer
18 views

Does the Duration Field in 802.11 Depend on SNR

I am trying to understand the behavior of the Duration/ID field in 802.11 specs. Its role and behavior are outlined in the standard. This field tells other stations how long the transmitter is going ...
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1answer
59 views

Wireshark not showing Frequency/Channel

I am using Ubuntu 18, and wireshark-gtk. I followed this and this tutorials to create a column named/showing frequency/channel. But all the packets I captured have no frequency/channel showing.I tried ...
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1answer
93 views

Are there other protocols for enforcing AAA besides RADIUS?

I know this is not the ideal question format but I need to lean upon the expertise in this community. I am looking for a simpler method of implementing AAA (Authentication, Authorization and ...
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1answer
38 views

IPv4 Subnetting for 1200 or more devices for WiFi

I am currently looking over my schools existing Subnets and their usage. Some seem to be sufficent, others not so much. What is the best practice when you need to support 1200 or more devices on a ...
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20 views

How can I block the Internet and mobile data fallback? [closed]

Hoping to block outgoing WAN access from my network during certain periods as well as stopping mobile devices from auto-failing-over to their mobile data. Of course this won't be perfect since devices ...
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1answer
49 views

in 802.11, when must a station go to the “random fall back slot” mechanism?

i've been reading Michael Gast's 2005 book on 802.11, and he talks about how each station, after it has seized a channel and finished transmitting, will then have its NAV timer expire (along with all ...
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42 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 ...
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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?
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4answers
83 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 ...
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1answer
43 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 ...
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26 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 ...
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1answer
60 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 ...
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1answer
49 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 ...
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35 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 ...
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1answer
168 views

meraki bridge mode: dhcp is untagged

We have the following set-up: +------+ +--------+ +--------+ |Router|-----| switch |-----| Meraki | +------+ +--------+ +--------+ | +---------+ ...
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1answer
118 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 ...
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1answer
149 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 ?
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60 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 ...
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1answer
57 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 ...
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53 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?
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63 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 ...
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136 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 ...
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144 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 ...
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1answer
184 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 ...
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2answers
65 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 ...
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62 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
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171 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 ...
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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 ...
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25 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 ...
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2answers
79 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?
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45 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....
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62 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 ...
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1answer
107 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 ...
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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 ...
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3answers
45 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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4answers
94 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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125 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
90 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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2answers
150 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
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 ...
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1answer
88 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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0answers
47 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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76 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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1answer
75 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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