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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13 views

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 ...
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I have 2 WiFi adapters but only ONE pings all IPs [closed]

I have two WiFi adapters : WiFi 1 (default, internal adapter for my desktop) WiFi 2 (USB WiFi adapater) On WiFi 1, I get request timeout when trying to ping some IP addresses but WiFi 2 successfully ...
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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 ...
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37 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 ...
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2answers
41 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 ...
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1answer
32 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 ...
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1answer
38 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 ...
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2answers
105 views

Is knowing MAC needed for talking to another device in same wifi network?

I have heard about ARP protocol for learning MAC address of other devices in a LAN for communicating with each other. However, I am bit confused about how it works in a typical infrastructure mode, ...
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1answer
39 views

how ieee 802.11s does channel switching? is it supported?

I'm studying about IEEE 802.11s wireless mesh networks every where on documents i read is pointed that all Mesh Point must be on same channel for discovery and peering. But i can't find anything about ...
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90 views

Using 40 MHz wide channels in a 2.4 GHz wireless network deployment

We have a site (a secondary school) where all WiFi networks are managed by us. The building should in theory have no rogue APs that introduce interference, however, other RF emitters such as ...
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2answers
37 views

How to tell if a device on the network is an access point?

Let's say we have a network with multiple access points. The command arp -a can be used to list the IP addresses and physical addresses of the devices that are on the same network. Now, is there a way ...
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For DCF (Distributed coordination function) based WLANs, in what scenario can cause frame collisions?

I am studying network communication and get confused about this concept. Since I know DCF has the backoff scheme for frame transmission and will sense the channel status before start transmit data. So ...
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Why are there 11 channels in WiFi communication instead of 3?

I'm a little confused about subdividing the WiFi radio band into 11 channels in the USA, 14 in Japan, and 13 in Europe, and to then use just 3 of them because of the overlapping problem. Why didn't ...
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How to determine which Wifi channel offers the least interference?

I'm trying to set up a roaming wireless network. For this, I have tried to analyze the area of coverage for any external network interference. I do know that networks can change over time and Wifi ...
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19 views

How is it possible that CSMA/CA works in areas with a lot of users within a small radius (e.g. rallies, concerts, etc.)?

My understanding of CSMA/CA is that devices listen until a Wi-Fi channel is idle before sending packets. If a collision still happens, then the devices waits a random interval before attempting to ...
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1answer
38 views

UniFi Network Controller WLAN channel display meaning

I don't quite understand the WLAN channel display. Elsewhere in the UniFi Network Controller, the channel is set to 1. But what does the number 3 in the display below mean? To clearify the situation ...
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1answer
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Is wifi power consumption related to password length

For wifi the Max password length is 63 characters. When I choose such a long password will this lead to notably higher power consumption of the network device (router, smartphone, ...)? I would guess ...
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113 views

802.11s versus IBSS mesh (with layer 3 routing protocol)

I just learned that you can create a Wi-Fi mesh network either with the "native Wi-Fi mesh standard" 802.11s, or by putting all devices of the network in the IBSS mode and run a layer-3 mesh ...
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43 views

Where does the 4way handshake fit in with the 802.11 Authentication Frame

In an open network you have the authentication frame on just the 802.11 level: but if the network has WEP or WPA(2/3) there will also be a four way handshake: My question is, where does the 4 way ...
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1answer
73 views

Difference between standards, protocols and working groups?

I am trying to understand the meaning of standards, protocols and working groups. I read that the 802.11 of the IEEE organization is a working group, trying to implement some standards. I think that I ...
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3answers
45 views

How does the network client pick a wifi signal, given two available frequencies?

This might be basic, but I don't know the answer... Given a router and a client, both having 2.4G (slower, more range) and 5.XG (faster, less range) frequency radios (and both named with the same SSID ...
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1answer
40 views

Mesh network 802.11d vs adhoc

What is the difference between 802.11s and adhoc? Is it compulsory to have same channel for wireless mesh node or it can have created using different channels where neighbouring nodes on on 2 non ...
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Mixing 802.11 channel widths

I don't want to dive too deep into Apple's approach to 802.11 other than to say it's what sparked this question. Apple's CoreWLAN setWLANChannel() method allows macOS application to set the NIC wifi ...
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2answers
511 views

What's the relation between IEEE 802.11s Mesh and the Wi-Fi Certified EasyMesh?

We know there's the the IEEE 802.11s mesh amendment that operates on the L2 MAC layer There's also the Wi-Fi Alliance's "Wi-Fi CERTIFIED EasyMesh™" thingy for bringing mesh interpretability ...
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Does a low WIFI signal affects how many clients can connect?

We have a room which is not very close to the AP and the signal is low. But a laptop with a quality radio connects perfectly. I am wondering if this will change when the number of clients grows? Such ...
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WiFi AP mode. Is AP bradcasting SSID all the time or when it receives the request from the station

WiFi AP mode. Is AP bradcasting SSID all the time or only when it receives the request from the station? I cant find the answer and maybe someone of you guys know the answer.
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Does each node in a Wi-Fi mesh system broadcast its own separate SSID?

From previous experience of both setting up and managing Wi-Fi extenders, my understanding from carrying out scans of the 2.4/5GHz bands is that each extender broadcasts its own SSID - however, I'm ...
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653 views

WLC <-> AP CAPWAP communications and ports

According to this document, you need to open UDP 1024 - 65535 between WLC (source) and APs (dest). And it's correct - I can see these sessions getting dropped on my firewall since I didn't open those ...
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Implementation of CSMA/CA between orthogonal channels?

In CSMA/CA, it is well known that hosts are not transmitting if they are detecting a signal. However, is it true that in 802.11ac, a host won't wait even if it detects a signal of an orthogonal ...
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21 views

How many time can a Block Acknowledgement Request can be sent if no BA is received, in 802.11 networks?

If we consider a 802.11 ac network, how many time, at most, can a Block Acknowledgement Request be retransmitted if it is not received at first? I'm running simulations in the ns-3 simulator, and I ...
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1answer
87 views

Wireless, powerline or ethernet right next to electric cable

I need a new point of access to our existing network. We have power sockets but no Ethernet cable on the spot. I see three possible solutions to achieve this: Add a new WiFi6 router and connect it to ...
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1answer
110 views

wireless network with seamless roaming with APs from different vendors

I've been reading about seamless roaming and IEEE 802.11k/v/r standards, but from a practical point of view it is not clear to me. I want to deploy a set of access points, all connected between ...
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69 views

If two Wi-Fi access points share the same BSSID, does it mean that they work on the same channel?

It is my understanding that if an ESSID is used by several sets of APs on several channels (let's say one AP = one channel only), then two APs sharing a BSSID should also share their radio ...
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1answer
98 views

Do all devices which use Wi-Fi (802.11) use CSMA/CA?

I know this is quite trivial, but I just want to know if all devices which support Wi-Fi through interface cards/hardware (like laptops/PCs/phones..etc) use CSMA/CA irrespective of their router/...
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1answer
67 views

How is a video calls bandwidth reserved on a wifi network?

All the older versions of Wifi, except for Wifi-6, give each device on the network the entire bandwidth /highway no matter how small the amount of data it needs to transfer. Can someone explain how ...
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34 views

CAPWAP encryption

I'm new to wireless networking and I have a question that might be dumb. Regular 802.11 uses AES/TKIP encryption. CAPWAP uses DTLS encryption, but CAPWAP is also 802.11 spec. Can you please explain ...
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2answers
92 views

List of frequencies that a device can connect to over 2.4 and 5 GHz channels

When connecting to a Wifi on 2.4GHz or 5GHz channel, a device connects on a certain frequency. Is there a somewhere list of all possible frequencies that a device can connect to on a 2.4GHz/5GHz ...
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96 views

How should OSPF work over WiFi? [closed]

I've had problems running OSPF over my WiFi network, and it seems to be related to multicast. The routers can't maintain a neighbor relationship, and when I watch the packet traffic I see one router ...
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1k views

Do I need to re-authenticate every time I switch a access point?

I have multiple Access Points on the same network with a Radius server for authentication. When I switch from one AP to another, do I have to go through the complete re-authentication processes each ...
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1answer
70 views

Does tcpdump work differently from Omnipeek?

I have been trying to analyze packets using tcpdump. I am trying to use a wireless card and capture packets through monitor mode, instead of promiscuous mode, since I want to see what kind of traffic ...
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1answer
60 views

i am so curious about naming IEEE standard network,like why do we use "802" these three numbers? [duplicate]

I learnt some information about networks in Wiki,and I am so curious about naming IEEE standard networks. As far as I know: The standard name of Wifi is 802 The standard name of Ethernet is 802.3 The ...
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1answer
42 views

Range of router and device in WiFi [closed]

Is range of the wifi network depend on Router only? Or does it depend on the connection device also? I believe that the device need to transmit packet to router, so the range till which the device can ...
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3answers
113 views

Have we failed a wireless survey for something that couldnt have been offered?

On a large campus wireless network (approx. 500 APs, 4-5000 connected devices) we have been asked to create an SSID for some specific equipment that can only work on the 2.4Ghz range. No problems with ...
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58 views

Reconciling multiple definitions of Bandwidth

I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could find are: difference between the upper and lower frequencies in ...
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1answer
101 views

How many 160Mhz channels can 801.11ax support? [closed]

With an 801.11ax WLAN, how many simultaneous connections could be made using 160Mhz wide channels?
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1answer
93 views

Is MIMO equivalent to link aggregation?

Is MIMO the wireless version of link aggregation in wired networks? I'm not asking if MIMO is a similar link aggregation protocol like LACP or PAgP, what I'm asking is if it is the same concept as ...
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2answers
48 views

Can computers connected within a Network via Ethernet monitor access the information uploaded/downloaded on a different computer

Suppose there are many computers connected within a Network. Let's take 2 examples. Computer A and Computer B, connected within the same network. Suppose, At the start of the day, say myself as an ...
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229 views

Meraki AP reboot?

Does Meraki WiFi Access Points reboot after 4 Hours of not getting reach-ability with Cloud Controller?
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2answers
114 views

Add access point to wireless network [closed]

I've got an existing wireless network with two access points on it: A TP-Link Archer C2600 on 2.4GHz (802.11b/g/n mixed) and 5GHz (802.11a/n/ac mixed), with WPA/WPA2-Personal security; A UniFi AP-AC-...
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1answer
37 views

Could 802.11ax devices still get benefits from OFDMA if there is unsupported 802.11ax devices?

As far as I know, 802.11ax supported OFDMA modulation, which can separate different amount of sub-carriers to each device in each time slot. I want to figure out if there is unsupported 802.11ax ...

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