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Questions tagged [wireless]

For questions about wireless networking (802.11), including any licensed or unlicensed RF medium used to provide point-to-point or point-to-multipoint network links.

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How can 802.11be avoid the Shannon-Hartley theorem?

I read that 802.11be is expected to have a max speed of 40,000Mbps, but only a bandwidth of 320MHz. How is that possible? My (new) understanding of the Shannon-Hartley theorem says this would ...
Erhannis's user avatar
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Do wifi adapters do switching internally or do the packets go through the OS networking stack?

According to Does wireless traffic in a network still have to go through a switch?, packets sent between devices connected to the same AP still goes through the AP. My question is how exactly does the ...
Poscat's user avatar
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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 ...
allexj's user avatar
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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 ...
Sgg8's user avatar
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Communicating Between Two Devices When One Lacks Internet Access

I am currently developing a software that needs to establish communication between two devices. Device 1 has internet capabilities, while device 2 may not always have internet access. I am ...
FledDev'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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Can MAC fragmentation improve throughput fairness in 802.11?

If I fragment data on the MAC layer, can I improve the throughput fairness in 802.11? Initially, I thought so, because if a client always sends very long frames and another client always sends short ...
leonboe1's user avatar
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Why mobile communication protocols have *G umbrella names?

Why mobile communication protocols have *G umbrella names, like 1G, 2G, 3G, 4G and 5G? Who order them? And most inportantly, have them any technically defitions? I mean, actually protocols are GSM, ...
worner's user avatar
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Setting up a local network with access to the internet through a wireless access point

Intro At work we want to setup an 8 node raspberry pi cluster. The purpose of the cluster is to test different technologies and have a good time. We cant manage the wifi at work and the only way we ...
Christopher Brøndholt's user avatar
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Recover Aironet AP-ESC doesn’t seem to break c2602 boot sequence

I am trying to reuse an old Cisco Aironet c2602 Autonomous AP; I need to reset the password. CCO instructions say that I need to hit ESC repeatedly while I am on the console during the AP boot ...
Mike Pennington's user avatar
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Cisco WDS, FreeRadius and LEAP

Freeradius got rid of LEAP since some pointrelease of 3.2.x, and I'm stuck configuring Cisco WDS on their Aironet series. Since forever there was a tweak with LEAP in Cisco configuration like this: ...
drookie's user avatar
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aruba access point join uptime and device uptime

just a question how do you determine from the controller the AP device uptime and join uptime to the controller? I'm confused when I run "show ap database". I can see the AP uptime, was that ...
dlareg28's user avatar
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173 views

Sanity Check: Changing MTU on Wifi Endpoints (computers) should be a LAST resort, right?

A client of mine has an organizational network that is comprised of a lot of Ubiquity gear, primarily switches and wireless routers to power their network, with a Sophos XG firewall at the border. ...
Thomas Ward's user avatar
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Router to Wireless router (Packet Tracer)

Hi, Can anyone help why I can't ping from my pc in office network to my laptop in guest network or wireless network. It is possible to ping from guest network to office but failed vice versa. Main ...
eccentric learner's user avatar
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1 answer
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Internet speed over wifi through walls

I understand that my internet speed over Wi-Fi will deteriorate over distance , especially through walls. My question is, will speeds drop to a set value, or will it drop as a percentage of the ...
Crudler's user avatar
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Was Bluetooth AMP actually used?

Bluetooth AMP (Alternative MAC/PHY) is a way for bluetooth of using the 802.11 MAC/PHY, e.g. Wi-Fi, as a transport to send "High Speed" data, hence the "HS" in the "Bluetooth ...
user87470'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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Authenticating APs and WLCs

I am currently learning about WLCs and Lightweight APs. My book mentions that every AP and WLC must authenticate each other with digital certificates, and that a X.509 certificate is preinstalled in ...
Mitrixsen's user avatar
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What datalink protocol is used in aircraft to ground station communication? [closed]

Laptops, mobile devices, and smart TVs communicate to access point via WiFi. Wireless peripherals (mouse / keyboard) communicate to workstations via Bluetooth. Mobile phones communicate to base ...
Noob_Guy's user avatar
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5 votes
2 answers
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Stretching VLANS across a network infrastructure

I am learning about Autonomous and Lightweight APs at the moment and I came across this slide from a course that I follow. This specific line I know that this problem can be solved by using ...
Mitrixsen's user avatar
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Extended Service Set in Wireless Networks

I am learning about the different kinds of service sets in Wireless networks and I have a few questions about the ESS. If the BSSs had the same settings but different SSIDs, would this still be ...
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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6 votes
3 answers
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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 ...
Mitrixsen's user avatar
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Inability to access wireless printer on same wireless LAN from a wireless device on another frequency

I am not sure whether this question should be on Server Fault or on Network Engineering. In order to ask my question, I first need to describe the problem I am facing: Say I have a LAN 10.0.0.0/24 and ...
Robin Hood's user avatar
2 votes
3 answers
92 views

Network Oversubscription

I am just joining my firm, and there is already an issue I am taking a look at. I am not part of the networking team but want to contribute as much as I am able. Our firm is experiencing a drastic ...
user86216's user avatar
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 ...
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157 views

Packet tracer help with routing between multiple company routers with vlans and wireless routers

Im still quite a novice to packet tracer (so im sorry if this has been answered) and I'm trying to ping both vlans at company1 router to both Lans at company2 router but for some reason when the ...
Lykadios's user avatar
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1 answer
72 views

Why is ICMP placed in transport layer in 6TSCH protocol stack?

my whole college education I was sure that ICMP protocol is a Network Layer protocol. I am now working with 6TSCH protocol and it's stack contains ICMPv6 in a Transport Layer, for example in this RFC: ...
Artur's user avatar
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125 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 ...
Suttwells's user avatar
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1 answer
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Relation between mean delay and network size

I am studying the effect of network size on the mean delay per received packet of a wireless sensor network. I am using a duty-cycled asynchronous MAC protocol.The topology is all sources directly ...
1118716's user avatar
1 vote
3 answers
269 views

Do telephone calls work at Layer2?

We know that Wi-Fi works in both layer1 and layer2 and travel through air in layer1. My question is when we create mobile phone call during connection establishment phase sender Mac address and ...
S. M.'s user avatar
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3 votes
4 answers
3k views

Why is microwave faster than infrared as a transmission medium?

I've read¹ that microwave is a faster medium of transmission of data than infrared. But considering that infrared waves have higher frequencies (and a little bigger frequency range too) than microwave,...
Balu's user avatar
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1 answer
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WAP configuration consistency

Simple question, are WAPs always configured from the default gateway's web interface? Do you ever have to go somewhere else?
Meester Moo's user avatar
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1 answer
115 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 ...
Ewan's user avatar
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1 vote
1 answer
142 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 ...
user avatar
4 votes
1 answer
653 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
241 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
2 votes
0 answers
217 views

Overlapping IP addressing on dynamically assigned wireless VLANs (can Fortigate do this?) [closed]

Broad question touching many vendors. CONTEXT DESCRIPTION For a project of a client of mine (I'm giving the context to make things clearer, please don't reply with "get a professional", I'm ...
user2984629's user avatar
0 votes
1 answer
1k views

Why use subnet mask /30 for the internet port of the edge router? [closed]

In the following network, why should we pick the subnet mask /30 for the internet port of Edge Router 1? Since the wireless access point Edge Router 1 needs to connect to 3 hosts in LAN 1, a subnet ...
user avatar
0 votes
1 answer
211 views

How do wireless access points work? [closed]

I understand what the intent of wireless access points are but I am struggling to understand them fully on a deeper level. So, do wireless access points have their own network with their own IP ...
Cole's user avatar
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0 votes
1 answer
40 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 ...
Yan King Yin's user avatar
3 votes
4 answers
451 views

How to add two VLANs for DHCP Pool

Currently one of my customer has DHCP pool created in Cisco Switch and ip address range is 192.168.25.0/24 (This is a VLAN). Now they have 230 devices and They are going to increase device count by ...
infra's user avatar
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A possible solution to offloading clients on an existing network

I am working with an existing network that services approximately 1500 rural wireless clients [diagram: Customer], and it uses a single core Arista 7050T layer3 switch [diagram: Main Router] hooked up ...
Escape75's user avatar
1 vote
1 answer
227 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 ...
Ariyan's user avatar
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0 votes
1 answer
396 views

High RX Pause Frame on Cisco 2960X

I have a Ruckus R310 that connected to Cisco 2960X and I saw a high RX pause frame. show flowcontrol interface gi1/0/1 Port Send FlowControl Receive FlowControl RxPause TxPause ...
sandy blaza's user avatar
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1 answer
177 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 ...
Prototype700's user avatar
0 votes
1 answer
26 views

Possible to denylist individual WiFi AP device, but not SSID? [closed]

In a situation where a network of WiFi access points all serve the same SSID, is there a mechanism to configure WiFi client devices to connect to the SSID but ignore an individual AP? Specifically, I'...
Mu Mind's user avatar
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0 votes
1 answer
781 views

Loop detection in Extreme switch

I am facing problem since a month in my wireless network. I have extreme switch in my office and with switchport 22 i have given to backhaul with wireless vlan to it, the problem is that my switchport ...
Anjil Khadka's user avatar
2 votes
1 answer
847 views

pFsense, Unifi AP, HP switch and VLANS

I have a Unifi AP with a single MYNET SSID connected to my HP 2520 switch on port 23. I have a pfSense LAN interface connected on port 1. AP clients get DHCP (192.168.1.0/24) from pfSense and can ...
Nstevens's user avatar
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0 answers
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In wireless networks, how do Service Sets and Basic Service Sets relate to each other, if they do?

I am beginning to learn about networks and wireless networks, specifically, and am having trouble grasping how do Service Sets and Basic Service Sets relate to each other, if they do. Are Basic ...
Veverke's user avatar
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