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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12 views

I need help please [closed]

This is probably the stupidest question ever but I have to ask .... how can I get to the bottom of who owns this up address 169.234.229.230 ? I went thru some websites but couldn’t make sense of it ...
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1answer
25 views

How can i set up a Wireless LAN to serve 20,000 concurrent devices [closed]

How can i setup a wireless LAN that can serve up to 20,000 concurrent devices. I am having a problem in figuring out if i need one router or several routers. A topology diagram with explanation would ...
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19 views

Sophos AV: suspicious [closed]

Hello I don't really don't know where to ask this question and I'am new in here. My problem was that I tried to get a link into VirusTotal to try to see if it has some virus, the problem is that when ...
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39 views

Routing between two sites using FTTC Broadband and E-Band Wireless

I have two sites, both with 80/20 FTTC broadband connections that terminate at the standard white box BT modem. The connections both have fixed IP. I’d like to connect these up to each other and form ...
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Cannot Ping Devices connected to powerline when RE200 is on the powerline network [closed]

I am a proud owner of TP-Link Products and things are going well regarding everything except with something regarding this configuration. When the RE200 is connected to the network, Devices connected ...
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When I turnoff wifi in my phone what exactly happens deauthentication or diassocation? [closed]

I am a beginner in wifi and have started reading it.. I have a question When I turnoff wifi in my phone what exactly happens deauthentication or diassocation? I am unable to differentiate..Plz help
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Only one WIFI mesh network node can apparently see the other node(?). How might i troubleshoot it? [closed]

I'm trying to set up a wifi mesh network on/between a PC and a Rasberry Pi 4b (not using the onboard wifi). But seem to have hit a snag on the PC node side. For some reason, apparently only the ...
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1answer
251 views

ARP spoofing over WLAN

As I understand, in ARP spoofing (of any kind), there's a man in the middle that intercepts frames from a sender (Alice) by masquerading as a receiver (Bob) and passes this frame to the server by ...
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3answers
99 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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1answer
36 views

Some mobile clients are unable to connect to UniFi AP mysteriously

We have two UniFi Controllers, one contains the main internet its directly connected to the fibre and then we give internet to the second controller using LAN connection, internet works fine in main ...
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1answer
31 views

How a wifi AP handle packets

Computers are connected to a wifi AP. The wifi AP is connected to a L2 switch. A server is also conected to this switch. When computers sends packets to the server, how the wifi AP manages the paquets?...
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30 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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34 views

How does mesh network handles seamless roaming?

When extending a WMN to a city-wide scale one of the problem it faces is seamless handoff. So, do I need to implement one of the ticket based authentication for it to work seamlessly or will IEEE 802....
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49 views

How can I consider the noise from my neighbor in V2X? [closed]

I'm working in v2x and I'm trying to calculate the date rate for specific vehicles in the road. How can I consider the other neighbor's vehicle's interference when calculating the date rate for my ...
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1answer
19 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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1answer
70 views

Do mobile phones continuously broadcast their IMEI number so that cell towers can find them?

Edward Snowden said that in an interview. Is it exactly true? Does it have to do with SSN (sim serial number)? Is the SSN broadcasted with encryption and modulation done to it or is the IMEI number?
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18 views

Zigbee authentication protocol [closed]

I'm writing a Thesis on IoT networks and authentication protocols, I've found this technology called Zigbee that seems to be really interesting but i can't find anything about which authentication ...
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1answer
74 views

link asa with core switch to wlc

have 4 switch 3560 POE-8 , 2 of them have been RESET, AND w l c 2100 RESET too, but there are firewall AND ONE switch. Keeps the OLD CONFIG. I try to restore the network to the same old ...
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2answers
42 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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11answers
36k views

How do you prevent rogue wireless access points on a network?

Depending on what type of traffic is going over the network, it's often not feasible that an employee brings a wireless router and sets it up into your network. This is because often, they are not or ...
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1answer
42 views

What kind of devices can be used to connect fiber optic segments via radio?

Say you want to connect building A to building B through a fiber optic cable, but at a given point, you are required to use a wireless connection (short range such as 10/20mt, where antennas are in ...
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1answer
31 views

How to save authorization infos on UniFi Network Controller?

We have two "Ubiquiti UniFi UAP AC LITE Router". They are great! But ex.: annually, I want to upgrade the firmware on them. For this, I quickly install an Ubuntu LTS in a virtual machine, install ...
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1answer
48 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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1answer
342 views

How do I capture an 802.11 MPDU Delimiter field?

I would like to be able to capture an MPDU Delimiter that is part of an A-MPDU, and see the contents of those 4 bytes displayed on the image below. Is there a way to do this in, for example, ...
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3answers
13k 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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1answer
48 views

Trying to setup 5Gbps setup with APC and AP

I currently have a 5Gbps line being provided and want to set up an Access Point Controller (WEC-8050) with Access Points (WEA512i) and Cisco Catalyst 2960-x 48 port, is this possible? The APC and ...
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1answer
35 views

Cisco packer tracer training - exercise 2.1.1.5 [closed]

I’m currently starting Cisco and using the packet tracer course, but I’m having an issue with a section creating a simply topology. Everything good apart from one thing which is from wireless router ...
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1answer
25 views

How to connect two routers to the same network via an F-connector? [closed]

To clarify the situation, my ISP gave me a Cisco EPC3928S router which has F-connector input like shown in the picture below. On the second floor they set an additional coax cable for the television. ...
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1answer
38 views

How does SISO and SU-MIMO serve multiple clients?

I am new to wireless. From what I read, SISO serves only 1 client at a time and SU-MIMO can serve multiple clients but at different times. So does SISO and SU-MIMO serve 1 client and then wait until ...
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2answers
70 views

Is there packet loss in WLAN?

What happens if 2 end devices connect to the same AP and they wanted to exchange data (without connecting to the internet), but 1 device has a strong signal and the other has a weak signal? Is there ...
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1answer
22 views

Does the Duration Field in 802.11 Depend on SNR

I am trying to understand the behavior of the Duration/ID field in 802.11 specs. Its role and behavior are outlined in the standard. This field tells other stations how long the transmitter is going ...
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19 views

What should I be looking out for in a wireless router to support a large number of users?

I hope this is the correct place to ask this. I was placed in charge of the network of a small business. Previously, the number of wireless devices connected to the wireless router was under 20, and ...
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3answers
2k views

How to find the client who downloads a big file?

today I found out that somebody in our organization utilized our uplink for 100%. We have Cisco WLC 2500 where I could see in application monitoring that 80% traffic of the last 90 sec was a file ...
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23 views

How does direct sequence n-bit chipping code recover bit in the event of interference?

Say for example my data stream was 1010.Using 4-bit chipping code, with a random sequence of 0100101101011001. The XOR'd data which the receiver receives is 1011101110101001. I understand that ...
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1answer
76 views

Is WIFI like a hub, switch or router?

A wireless router; the wireless part of it, is that a layer 2 or layer 3 device? I have heard that a WiFi router is just a wired router with a built-in wireless AP, and since a wireless AP functions ...
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2answers
63 views

Point to point link with two Internet connections

Thank you in advance for reading this question. I have two buildings, let's say A and B, each connected to the Internet. Devices in A also need to access devices in B and vice-versa. The Internet ...
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0answers
58 views

Cisco Prime: Accurate Wi-Fi association history?

I'm running Prime 3.7 with a 2504 WLC (8.5.151.0) and am finding that the client association history under Monitor -> Clients and Users -> [select a client] does not show associations that last less ...
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1answer
42 views

How do hosts filter broadcast signals in wireless network?

In bus/hub network, hosts check the destination address of every broadcasted packet they receive and accept it if they are the destination, otherwise they ignore it. Do we use the same principle in ...
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1answer
246 views

Lightweight AP won't join with Wireless Lan Controller

I'm trying to set up a wireless network, and learn at the same time. I'm using a Cisco 5508 WLC and a AIR-CAP3702I-A-K9 lightweight AP. The problem I'm having is that the LAP won't joing with the WLC. ...
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1answer
41 views

How a wireless access point reads all the available SSIDs

When a wireless access point is broadcasting its SSID (beacon frame) I assume it sends it on specific selected channel (channel 1-14 for 2.4 GHz network). But how do all the other access point ...
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1answer
118 views

Has anyone successfully deployed WLC 8.3+ anchored wlan with PSK and CWA?

There seems to be something broken with Cisco WLC 8.3.140 and 143. 8.3 was the first AireOS release training to add MAC Filtering (CWA) and PSK. ISE is serving as the RADIUS server (v2.2). I can get ...
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2answers
142 views

Can I set up a WLAN with a WAP but without Internet?

I was able to set up a LAN with the following configuration : A main computer (Windows PC) with a DHCP and DNS server, who is configured to have a static IP address Three devices (embedded Linux) ...
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49 views

Does Wireshark capture all Wi-Fi traffic under the same access point even with WPA encryption?

I know that free unencrypted-Wi-Fi is dangerous since all the traffic in the same AP is visible. Does Wireshark capture all Wi-Fi traffic under the same access point even with WPA encryption?
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4answers
108 views

How 802.11 LAN will avoid packet collision in a wireless medium?

Say we have a router (capable of the 802.11 protocol standards) and some number of devices that are configured to communicate with this router. I have learnt about how devices/nodes use CSMA/CA to ...
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2answers
92 views

What is the purpose of 802.11 authentication? [duplicate]

Why does client authenticate before associating with the AP. What does open system authentication even achieve. I fail get an accurate reason from my web searches.
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1answer
94 views

Passive parabolic 2.4 GHz WiFi antenna to directional antenna repeater

Please excuse my lack of proficiency in this subject. I am just begining my understanding of antennas, bridges, repeaters and the like. I have a somewhat standard situation of two buildings ...
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1answer
180 views

AP won't join WLC

I have a lightweight AP AIR-AP3802I-E-K9 that I'm trying to connect to my WLC, but it just won't. When I run a debug on the WLC, I can see the Join request from my AP, and I can see my WLC sending a ...
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2answers
71 views

Functionality differences between an Wireless Access Point and a Switch?

I have a WAP connected to a switch via a twisted pair cable. Aside from the communication medium to other nodes (electrical signal vs radio waves), do they operate the same way? Specifically: When ...
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7answers
14k views

Full-duplex with two antennas

It is said that wireless is a half-duplex medium. "Dual-band" stations are now common, with one antenna in the 2.4 GHz band, and the other in the 5GHz band. Suppose now we have stations with both ...
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1answer
58 views

Why do wifi devices slow down as other devices start doing work?

I've been doing some testing lately on 802.11g and I'm very confused by the results. I'll go into the details below. First please understand I'm a software developer, but not a network engineer. I ...

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