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.
441
questions
0
votes
0
answers
15
views
why WEP isnt secure [closed]
i just want to make sure what i know is correct about why WEP isnt secure. when a client wants to send data to AP using WEP, the WEP key(which is the password the user uses to connect to wifi-so this ...
0
votes
1
answer
44
views
frequency channels and wifi
i always hear that when i want to use multiple access points, i have to make them use different channels to avoid the interference of the radio waves. supposing that i have a router with built in AP(...
0
votes
0
answers
34
views
IEEE 802.11s Mesh: IP Address to MAC Correlation?
I'm attempting to better understand IEEE 802.11s wireless mesh networks and I don't understand how IP addresses are correlated to MAC addresses if the mesh channel has a different MAC address than the ...
- 1
0
votes
0
answers
53
views
Single 4x4:4 MU-MIMO vs Two 2x2:2 MU-MIMO APs
Just out of curiosity, in general, what would be the pros and cons of having a single 4x4:4 MU-MIMO AP vs having two 2x2:2 MU-MIMO APs in the same network? (Assume that they are the same brand with ...
- 101
0
votes
0
answers
38
views
Enhancing 802.11ac MU-MIMO Efficiency: Simultaneous STA-AP and AP-STA Transmission Impact on Goodput Prediction
In 802.11ac' MU-MIMO two things (it's a XOR) can happen since wireless is half duplex: 1)at the same time more STAs transmit to AP 2)at the same time AP transmits to more STAs. Is this true? If so, if ...
- 1
1
vote
0
answers
46
views
Why isn't my computer flooded with Beacon frames?
I used Wireshark to capture IEEE 802.11 Beacon frames in promiscuous mode. I see frames from about a dozen of AP's around me.
But I receive them only once in a few seconds, despite AP's having beacon ...
- 111
1
vote
1
answer
235
views
Exact difference between EAP and EAPoL
In the PSK authentication method, I see only 4 way handshake packets between supplicant and authenticator. They are called EAPoL in the Wireshark
What I know that when EAP is carried over LAN (...
- 123
0
votes
1
answer
166
views
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 ...
- 3
0
votes
0
answers
35
views
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 ...
- 1
1
vote
1
answer
335
views
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 ...
- 47
0
votes
1
answer
60
views
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 ...
0
votes
1
answer
52
views
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 ...
- 11
0
votes
1
answer
1k
views
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 ...
0
votes
1
answer
55
views
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/...
- 334
0
votes
1
answer
105
views
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 ...
0
votes
1
answer
27
views
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 ...
- 101
0
votes
1
answer
324
views
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?
- 3
1
vote
0
answers
90
views
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 ...
- 121
1
vote
1
answer
78
views
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?
- 125
0
votes
1
answer
475
views
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 ...
- 101
3
votes
3
answers
151
views
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 ...
- 31
2
votes
4
answers
140
views
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 ...
- 21
0
votes
1
answer
441
views
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 ...
- 877
0
votes
2
answers
217
views
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 ...
- 877
6
votes
3
answers
2k
views
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 ...
- 877
1
vote
1
answer
76
views
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 ...
- 113
1
vote
1
answer
95
views
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 ...
- 13
0
votes
1
answer
30
views
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 ...
1
vote
2
answers
753
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 ...
- 113
0
votes
2
answers
35
views
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 ...
0
votes
1
answer
73
views
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 ...
- 103
1
vote
2
answers
86
views
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 ...
- 111
1
vote
1
answer
103
views
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 ...
user85401
0
votes
0
answers
111
views
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 ...
- 111
0
votes
1
answer
136
views
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, ...
- 21
0
votes
0
answers
126
views
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 ...
0
votes
1
answer
518
views
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-...
0
votes
1
answer
35
views
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 ...
4
votes
1
answer
1k
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 ...
- 243
0
votes
1
answer
117
views
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 ...
- 1
1
vote
1
answer
147
views
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 ...
user71928
0
votes
2
answers
384
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 ...
user71928
0
votes
1
answer
45
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,...
- 113
-1
votes
1
answer
42
views
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 ...
4
votes
1
answer
682
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 ...
- 153
3
votes
2
answers
249
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 ...
- 132
0
votes
1
answer
524
views
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 ...
5
votes
1
answer
237
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 ...
- 53
0
votes
1
answer
147
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 (...
- 3
4
votes
1
answer
569
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?
- 97