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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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 ...
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UDP Broadcast Packets Lag On Receiving End ESP8266 and Raspberry Pi [closed]

I'm working on a cool lighting project where each person in a group will be wearing string lights that are controlled using an ESP8266 WiFi microcontroller. All of the ESPs connect to an AP created by ...
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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 ...
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1answer
20 views

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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1answer
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
44 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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2answers
106 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
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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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
2k views

How transparent bridging Wi-Fi with Ethernet works?

The way I understand (two-port) transparent bridging is that the bridge simply forwards packets to another segment on the network. But since the MAC address of the ethernet interface is different to ...
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2answers
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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
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How does an AP acquire a channel via RTS/CTS in IEEE802.11ac?

There is one thing I do not understand in this IEEE 80211ac MU-MIMO specification and it concerns the way an Access Point can safely acquire a channel via the RTS/CTS mechanism before sending multiple ...
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3answers
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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
863 views

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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62 views

Wifi antenna to detect clients

I would like to know if it is technically possible to detect and recognize a client (PC/smartphone) during its wifi scan. My goal is to get the list with identifiers like mac address or other unique ...
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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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38 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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1answer
124 views

In 802.11 Wi-Fi, Is it better to be on the same channel as other networks instead of being in an overlapping channel?

While being on the same channel as another network is not ideal, is it better than being on a neighboring overlapping channel because 802.11 specification has methods for dealing with co-channel ...
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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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3answers
1k views

Received Signal Strength Indication RSSI

This question is regarding RSSI. In particular, my understanding is that the RSSI is measured after reception at the antenna and after the ADC (analog to digital converter) and after the Low Noise ...
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0answers
26 views

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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20 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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2answers
520 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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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
3k views

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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1answer
1k views

meraki bridge mode: dhcp is untagged

We have the following set-up: +------+ +--------+ +--------+ |Router|-----| switch |-----| Meraki | +------+ +--------+ +--------+ | +---------+ ...
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115 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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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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2answers
2k views

Wireless access point to switch connection

I am a newbie to networking. I think I have a good grasp on Switching, routing and VLANs. I am trying to extend my knowledge to wireless networks. Looking for answers on a few questions Should I ...
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3answers
22k views

Is it better to use channel 13 than channel 11 on 2.4GHz band

When I analyzed the wifi networks in my area, most of them are set on channel 1 and channel 6, so it would be most wise for me to set it on channel 11. My router however, provides the option to set ...
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3answers
1k 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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3answers
524 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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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
43 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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0answers
28 views

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
409 views

The difference between routing and path selection

I am having difficulty in understanding the difference between the routing and path selection. I am working on IEEE 802.11s-based mesh networks and reading about the default routing protocol HWMP. In ...
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2answers
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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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4k views

Why is my UDP broadcast wireless communication capped at 1 MB/s?

I am trying to implement Network Coding over a meshed network. Therefore I need to send packets to several destinations, this is way I am using Broadcast packets. But I can not understand why this is ...
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1answer
17 views

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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43 views

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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2answers
661 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
111 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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70 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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24k views

Cisco APs ignore DHCP Option 43 and use CAPWAP UDP broadcasts

Background I am trying to redeploy Cisco 1242 LWAPs on new Cat4507R+E switches, which means the IP address of the WLC is changing for that LWAP. For some reason, I have to configure ip helper-...
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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
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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