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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iperf3 download and upload test simultaniously giving abnormal results

I have a server (Lenovo using Ubuntu) and 2 clients (both Mac). The server is connected with a Wi-Fi router over Eth interface. The two clients are connected with Wi-Fi router over WLAN interface. All ...
SAM's user avatar
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beacon interval & number of APs benefits/downsides/

As far as I understand, A beacon announces an AP's availability & capability, to allow clients to make decisions about which AP to connect to, does this mean it matters less the less APs are ...
Peter's user avatar
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DHCP packets in a Wi-Fi network (WEP2-Personal)

The DHCP packets with the message type Discover, Offer, Request and Acknowledge use the L2 broadcast address for communication (even in the Acknowledge packet which has an IP destination of the newly ...
Strategist's user avatar
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What device to use as an intermediary " Wifi Router" for a subnet, plug-and-play architecture?

I am new to network architecture so I apologize in advance for any nomenclature errors. I have 50 IoT devices (running Ubuntu) that I want to stream significant data from. These devices are only ...
Michael Kaca's user avatar
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Cisco 3650 and wifi hotspot

I have to connect wifi hotspots on cisco catalyst ports of cisco 3650. The wifi controller is connected on 2 ports, because it delivers 2 wifi vlans (6 and 40). The hotspots must receive an IP from ...
AnthonyS's user avatar
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CISCO 9800-L Controller internal dhcp not working - GUEST WIFI

I have been trying to configure a guest network for my Cisco Catalyst 9800-L Wireless Controller for some days now. For the guest network, i want it to use an internal dhcp on the controller. I have ...
Amarnauth Persaud's user avatar
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Can a WPA2 network be handled by not encrypted Wifi devices?

I have here some wifi hardware whose wifi encryption does not work et al (but as a not encrypted 802.11, it works well). I am thinking on to utilize it on way, where it does not need to encrypt/...
peterh's user avatar
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Could a frame have different vendor specific fields?

I was analyzing a database of probe requests until I found the following packet which has 3 different vendor specific fields. How to interpret that ? Is it just a wrong packet ? RadioTap version=0 ...
Mohamed Chaaben's user avatar
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Wifi air encription

I have a scenario where a Network Access Control (NAC) controlls the acces to a SSID (username and password), so the wifi controller doesnt have a password for it. Obviously the mobile devices ...
elysch's user avatar
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SSID password vs pre shared key

Can someone please explain in very straight forward terms the difference in the SSID password vs a pre shared key?
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802.11ah Wi-Fi HaLow theoretical network throughput with 100s of clients

What is the theoretical network throughput of a 802.11ah WiFi HaLow network with lets say 300 clients connected to a single AP? The networking overhead is supposed to grow with the number of stations ...
Kozuch's user avatar
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802.11ax and non 802.11ax AP on the same channel

What issues can cause 802.11ax AP that work on the same 2.4GHz channel with, for example, 802.11n AP with different BSSID? Is it worse than two 802.11n APs on the same channel with different BSSID?
Kamil Zaripov's user avatar
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Network connection into a Faraday cage

I have a situation where I need to put a WiFi-only IoT device inside a radiation-shielded space in which the facility WiFi doesn't work. (Even outside the shielded space the WiFi barely works, due, I ...
Chris Moller's user avatar
3 votes
3 answers
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Wifi solution to connect two warehouses on to same network

I’ve just acquired a second warehouse however it’s approx 100m from my current one. To save me the headache of having two wifi systems what’s the best solution to bring my current wifi network into my ...
Lewis's user avatar
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Access Point with Dual Network support

I am looking to combine 2 access points into a single one. At my company we have 2 separate networks. One is used for guests and the other for our internal network. At the moment, we have 6 APs ...
Mitja Kmetic's user avatar
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Active vs Passive scanning in Wireless Networks

I read that there are two ways a wireless client can scan for a wireless network. By sending probe requests and listening for a response by APs within range (Active Scanning) By waiting and listening ...
Mitrixsen's user avatar
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Can 2 devices communicate on the Internet at the same time using WiFi?

I am currently learning about Wireless networks and I have read that Wireless Networks are Half-Duplex and all devices receive the frames sent by other devices just like with Ethernet hubs. Does this ...
Mitrixsen's user avatar
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WiFi versus Wireless LANs

I've just started learning about Wireless networks and I have a question about the terms "WiFi" and "Wireless LAN". Whenever I think of WiFi, I think of connecting wirelessly to ...
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Is guard band used when bonding 20MHz channels together to form a 40+ MHz channels?

In IEEE 802.11n and above Wi-Fi channels occupy 20MHz bandwidth over the spectrum, and it is a good practice to skip some channels as they may fall inside another's band, thus creating a sort of guard ...
Danilo Fuchs's user avatar
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1 answer
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How can two or more devices connected to the same wireless network stream or download at the same time [duplicate]

After reading some introductory explanations about the 802.11 standard, i obviously still have some fundamental problems of understanding. When every device connected in the network, shares the ...
Reinmarius's user avatar
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Are multiple clients on a single AP limited to the same constellation

My question is quite simple. If I have multiple clients connected to the same radio on the same AP, is each client confined to the lowest modulation/carrier size of the weakest client? So if I have 12 ...
Devereux Gabriel's user avatar
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478 views

What is the loopback Ethertype?

IANA's list of IEEE 802 Ethertypes includes an entry for Loopback (0x9000). However, I cannot find any specification detailing exactly how this is implemented. Do frames sent with Ethertype 0x9000 ...
Ben Zelnick's user avatar
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Does sharing laptop Wi-Fi cause network noises or network slow down?

We have network (Wifi network) issues in our organization the network is slow and sometimes the access point throw out some connected users. We contacted ISP and they checked our network configuration ...
Asrar Ahmad Ehsan's user avatar
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Single SSID w/PSK to default VLAN, Secondary Auth EAP-TLS to a second VLAN

I'm wondering if the following is possible given the limitations/constraints of RADIUS, CoA, and fundamental limits of 802.11 authentication, etc. I would like a wireless configuration with a single ...
user3814483's user avatar
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WiFi password: What is the exposure? Is it only local or can WiFi password be used remotely somehow?

(As everyone does) I have a local WiFi password that is used for signing in and using the WiFi for local users. I have a separate & far stronger (64 char) admin password to gain access to my WiFi ...
raddevus's user avatar
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Does each computer/smart phone use electromagnetic wave with different frequency to communicate when they're connected to a WLAN?

I read some papers about WLAN and Wi-Fi. They say that modern WLAN/Wi-Fi uses a kind of technology called "OFDM(Orthogonal Frequency Division Multiplexing)". My understanding is: ODFM means ...
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What LLC type in wifi

I'm trying to understand how wifi (802.11) networks operates. I found that in 802.11, the 802.2 (LLC) layer is used and that this layer can follow different types. type 1 : no connection, no ack type ...
Romain Clair's user avatar
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Mechanism/purpose of the NAV and its relation to the exposed node problem in 802.11

802.11 uses csma/ca as the mac protocol. Every station senses the medium, if something is being sent, then they will set their NAV to the duration ID from the packet being sent weather RTS, CTS, DATA, ...
user062's user avatar
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Wifi 802.11ac dynamic channel width negotiation

Let's assume that AP1 is on channel 40 width 80mhz, AP2 is on channel 48 width 80mhz, It overlaps. As far as i understand 802.11ac has a functionality which detects width utilization per-frame and ...
Suttwells's user avatar
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Wireshark: Cannot find frame type of packets

I am getting used to Wireshark operation and currently, I am investigating different frames (control, management, data frame) and using filter in these links (https://mrncciew.com/2014/10/02/cwap-802-...
Nguyen Huy's user avatar
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mount a industrial network [closed]

my objective is mount a fault tolerance industrial network, in an already very populated factory. the factory has many production lines and i want to treat them as a separate islands... so i want to ...
oso_togari's user avatar
4 votes
1 answer
859 views

WiFi 2.4 Ghz vs microwave oven

I got lot of complains from colleagues on one of the sites where Cisco APs are installed, usually about poor quality and corrupted audio conferencing. But when I'm on site, everything is usually just ...
drookie's user avatar
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How to measure the SINR for channel bonding?

I use to have a set up of a WiFi environment where I assume all devices operating over the same wireless channel, i.e., a single 20 MHz channel. A device would treat the transmission of all ...
Ewan's user avatar
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1 answer
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Is the EAP-Request/Identity and EAP-Response/Identity transmitted in the clear in a WPA2 entreprise Wi-Fi setup?

Looking at the WPA2 (Entreprise, let's say PEAP-MSCHAPv2) Wi-Fi protocol, I understand that since WPA2 uses Open System Authentication, and that 802.1X authentication takes place before the 4-way ...
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2 answers
269 views

What is the point of Wi-Fi Association?

In the 802.11-2020 standard, you can read, regarding 802.11 Association To deliver an MSDU within an ESS via the DS, the DS needs to know which AP within the ESS to deliver the MSDU, so that the MSDU ...
user avatar
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1 answer
42 views

What defines WI-FI?

I don’t quite understand what exactly WI-FI is (regarding to the computer network theory). There are many different definitions of this term. Somewhere it's written that it's a wireless LAN technology,...
Ivan's user avatar
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802.11 Protocol on Different Frequency [closed]

Wifi (and the 802.11 protocol) takes place on 2.4Ghz and 5Ghz frequencies. Is it possible to recreate this protocol on a different frequency (say 500Mhz) and create a functional network using a modded ...
matharpre's user avatar
4 votes
1 answer
597 views

CAPWAP traffic flow

when a client wants to send inter-VLAN traffic, does this mean that the traffic first goes from the AP to the Wireless Controller (WLC) through CAPWAP tunnel, and then the WLC sends it to the default ...
Quirik's user avatar
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3 votes
2 answers
181 views

How effective is CSMA/CA for WLAN and when do collisions still happen?

I understand why CSMA/CA in WLAN is required over CSMA/CD from this post here and was left with the question how effective CSMA/CA is. So I was wondering if there still might be collisions at all. I ...
OuttaSpaceTime's user avatar
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1 answer
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Probe Request getting\understanding Information Elements (IEs)

I'm trying to read Information Elements (IEs) from the probe request can't seem to understand the stracture of it as I undersatnd it size can be 0-2312 bytes but how do I know how many there are? I ...
Afik_Android's user avatar
5 votes
1 answer
217 views

MAC collisions in Probe Requests

To find nearby routers, mobile devices send probe requests to coax the routers into sending probe responses. Since modern devices don't use their actual MAC address anymore but instead rely on MAC ...
heddha's user avatar
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1 answer
131 views

WPA2 Enterprise with Radius and User Password authentication (via Active Directory) - Confidentiality

We are planning to setup WPA2 Enterprise in our Office. We have Ubiquity APs, a Unifi Controller and want to use Windows Credentials for authentication. We want to use a Linux Radius server (...
Teosch's user avatar
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4 votes
1 answer
554 views

Can a radio share a MAC address with the ethernet interface of an access point?

I have a situation where I have found the BSSID to have a MAC address congruent to the MAC address of the ethernet interface. Is this possible? Does this happen with all access points?
Caine Kiewit's user avatar
1 vote
0 answers
108 views

Optimize Network For UDP Broadcast Traffic?

I have a computer that creates an AP which multiple microcontrollers connect to. The computer sends out UDP Broadcast packets that tell the microcontrollers to do different things. I have an issue ...
Noah's user avatar
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Probe request from user devices broadcasting what frequency?

I have been researching whether a device with a wifi interface sends out signals in the RF spectrum. I have been a little here and there, and I understand that wifi devices uses active and passive ...
Mdnia's user avatar
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1 answer
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Does a WiFi client vary the strength of the signal it emits? [closed]

I am using a metal container to dampen my WiFi router in the hope of reducing its radiation health risks. I'm wondering if the client device might increase its own emitted signal strength to ...
Yan King Yin's user avatar
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1 answer
159 views

Destination address in wifi frame for a host in a different network

I have couple of questions/doubts which I would like to get some advise on. Question#1 Suppose a STA A in infrastructure mode wants to send data to an exterior host (STA B), residing in different ...
Network_starter's user avatar
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2 answers
335 views

How does a border router work

Supposing, we have following pieces in a theoretical network architecture Network A: A low power IPV6 wireless network Some low power hosts: Low power devices which are connected to the above low ...
Network_starter's user avatar
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1 answer
75 views

Unwanted Wireshark Optimizing Received 802.11 Channel for Frames

I am trying to run an experiment which involves monitoring 3 wireless channels simultaneously in Wireshark which would allow me to see a single frame captured 3 times on each channel. To do this, I ...
Taylor Artunian's user avatar
2 votes
1 answer
72 views

Can wifi clients in same subnet talk to each other without a WAP?

I understand that a L2 device like WAP is needed to forward packets from one client to another within the same network (based on MAC mostly like in 802.11) However my question is, if there is no WAP ...
Network_starter's user avatar

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