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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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3
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1answer
124 views

Does the theoretical limit of 54 Mbps apply to any WiFi protocol limited to 20 MHz wide channel, even on a 5 Ghz channel?

I'm wondering if I limit my channel width on a really nice (Meraki WAPs capable of 802.11ac) WAPs, to 20 MHz to stop them from overlapping, or if the Auto Width channel setting is making that change. ...
5
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4answers
742 views

How risky is a personal-use-only wireless subnet inside the corporate subnet?

My company's security policy with respect to wireless routers is to not use them at all -- everyone's wired in. Devices for personal use, such as laptops or cell phones, have to use their phone's data ...
-2
votes
1answer
97 views

What type of IEEE 802.11 standard (a, b, g, n, ac….) implemented in today's smartphones? [closed]

IEEE 802.11 standard has several versions as a, b, g, n, ac... etc; since which standard is accommodated for smartphone's wifi feature?
2
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3answers
267 views

Really Invisible WiFi (not just hidden)

I want my WiFi to be invisible to anyone, and I don't mean hidden. I know about the hidden SSID method, but in this method the network is visible like "hidden network". I would like to create a really ...
10
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2answers
27k views

Can I truly multicast over WIFI?

Am streaming UDP over wifi (5ghz) - approx 1.5k/packet... trying to stream to ~10 devices simultaneously, with extremely low latency.. As I understand Wifi, it can never true multicast, as each ...
1
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1answer
1k views

Can I truly multicast over Wifi AP

I have a small dedicated wifi network setup specifically to carry a multicast multimedia package.. no other use (no web or other data on this network, due to the arrangement).. The issue I've found ...
1
vote
1answer
63 views

Recieving a packet multiple times in a wireless LAN Network using multicast

I need to send a packet to more than one reciever (lets say 30). Assume I don't care that some of them do not receive it now (Application Layer will handle this). Now my solution is to use multicast, ...
1
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2answers
2k views

Does a network switch broadcast local IP Addresses?

Please consider the following scenario The router (Linksys E2000) has an INTERNET port where the main network is plugged in. The router has some ETHERNET/OUT ports where a switch, laptop or PC can ...
4
votes
1answer
357 views

802.11 multicast buffering due to random back-off mechanism

I am trying to achieve periodic multicast with WAP (Wireless Access Point) [basically trying to stream real time audio data to multiple devices]. The regularity in the interval between successive UDP ...
4
votes
2answers
2k views

Decoding wpa-psk traffic with Wireshark

I want to plot how much data each client is using from a wpa-psk protected access point (that I control). For that I intend to monitor all traffic for a couple of days. However I can't decode the TCP ...
8
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4answers
3k views

Cisco 1260 AP no longer responds to ping, ssh after upgrade to latest 15.x firmware

I have a 1260 AP that I upgraded this morning. Prior to the upgrade, the system permitted ssh and would respond to pings on the network, however now it does not respond. I hooked up a serial cable ...
2
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2answers
512 views

What is 802.11 in the IEEE 802.11?

What is the number 802.11 in IEEE 802.11 representing? I mean, if you break it down, what exactly are 802 and 11?
2
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2answers
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 ...
3
votes
4answers
320 views

Is there any downside in broadcasting multiple wireless networks from the same router?

Is there any downside in broadcasting multiple wireless networks from the same router? Is there an upper limit? EDIT: I am mainly concerned with signal interference. I might be misunderstanding. ...
2
votes
2answers
95 views

How to design a wireless network for efficient multicast or broadcast communications?

First, a little bit of background information: I'm working on some custom software that allows a group of computers on the same LAN to co-operate on a real-time task in a distributed, fault-tolerant ...
2
votes
1answer
535 views

Comparison between WDS and Wired Router [closed]

I'm considering to set-up a hotspot(With Mikrotik RB951) in a place that has 4 floors so I should extend the wireless signal. I bought 4 wireless Routers (TP-Link WR841HP) That I want to put in each ...
1
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2answers
177 views

Understanding how a Wi-Fi transmitter chooses a BSSID for Virtual Access Points

I'm trying to understand if there is a certain protocol that a Wi-Fi transmitter must follow when creating a BSSID for virtual access points. In my university building, there are a bunch of CISCO ...
2
votes
1answer
1k views

Is there a minimum signal level required for co-channel interference?

I recently worked through a series of wifi issues and had to learn a bit in the process. While I've fixed my specific problems, I still have a lingering question about co-channel interference. ...
0
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2answers
181 views

Do Wi-Fi radio-waves interact with multiple devices simuntaneously or sequentially?

By the question above I am referring to how a Wi-Fi radio-wave works in terms of the data that it carries. For example, I know that routers use CSMA/CA (Carrier Sense Multiple Access with Collision ...
1
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1answer
1k views

What exactly is a 'virtual WiFi access point'?

Recently I've come across the notion of 'virtual WiFi AP'. For concrete examples of references to this notion, refer to these pointers: 1,2,3. I'm a bit confused about what virtual APs actually are. ...
4
votes
2answers
215 views

One ethernet plug, one floor ( 30 workstations )

Got a question about ethernet capacity that I'm unsure of. Moving into a new office, and a problem I phase is that there is only 1 ethernet wall plug on the complete floor. So only way would be to ...
-1
votes
2answers
54 views

Can the data usage be Oriented by Consume of Demand?

Let's imagine that a LAN house, solve to charge financially your users, through of data usage consumption and not by time of use. It Is possible do control individually of assignment of data usage for ...
1
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2answers
1k views

150 Mbps access point with 100 Mbps LAN port

If the LAN port of a wireless access point is 100 Mbps, then what is the need of 150 Mbps wireless speed? Why do they give 150 Mbps wireless speed?
0
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2answers
19 views

What kind of device do I need [closed]

I have two devices that need to be connected over wifi and get DHCP ip addresses both of them have ethenet ports so a figured I could save some money and get a external device that receives dhcp over ...
0
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1answer
30 views

Do high powered wifi adapters exist for point to point wifi networks? [closed]

I've been looking for a more powerful card but non seem to exist. It's necessary for me to use a high powered adapter as I have a point to point network setup between 2 buildings using TP-Link bi-...
0
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1answer
48 views

Is the auto-correlation of a frame transient based on the physical characteristics of a device?

I am currently studying ways to fingerprint Wi-Fi devices based on their physical characteristics and I was struck by a question after reading Section B of this paper http://www.ccs-labs.org/bib/...
5
votes
3answers
672 views

Will port scanning affect my networks stability?

My company has 2 separated networking systems: wired and wireless. The R&D department is now developing an application that runs on a PC to scan the devices on the wireless network (smartphones ...
1
vote
1answer
177 views

How does data send in DSSS with different range of frequencies?

I'm newbie in wireless communication and have many questions with spread spectrum. I've learned that spread spectrum method for transmission RF signal is less susceptible to intentional jamming or ...
1
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3answers
1k views

How to minimize broadcast-traffic in a multi-ap wireless network?

For example let's take a University's wireless network for the students or a Wifi in a Hotel: There are many wirelss devices that are causing broadcast traffic. In theory: Is there any way to ...
1
vote
1answer
1k views

Is PMKID same for a specific client when it is roaming from AP1 to AP2 using WPA2-Enterprise?

I have two access points (APs) setup with the same SSID name and using the same freeRADIUS server for station authentication. I have read Cisco documentation about fast roaming. So I have this doubt ...
3
votes
1answer
2k views

Packet injection in a Wi-Fi network

I have read some articles describing that one can use the monitor mode on a NIC to do packet injection. I really don't understand why I cannot just use the managed mode to forge the packets, and I ...
2
votes
2answers
966 views

Can't capture WLAN Probe Request

I am currently digging into WLAN management frames. For this, I wanted to capture management frames using few Linux utilities. So what I did so far is: Put my interface (wlp2s0) in managed mode ...
0
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1answer
42 views

Can I create my own Wi-Fi network on a pre-existing router? [closed]

I am a student, and the Wi-Fi at my school is very spotty. My laptop is connected to the Ethernet so that's no problem but my phone cannot connect to any of three Wi-Fi networks. Lots of people have ...
1
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4answers
224 views

Is Wifi security encriyption WEP separate from TKIP encryption?

Is Wifi security encryption WEP separate from TKIP encryption? Or do they both have to exist in order to work? WPA (WiFi Protected Access) is a protocol or encryption?
0
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2answers
330 views

Is the MAC address pool from which Bluetooth, Wi-Fi, GSM cards etc take their addresses from the same address pool as the ethernet MAC address pool?

I know that most wireless communication devices have a MAC address. I wonder if the pool from which their MAC addresses are assigned is the same address pool from which physical Ethernet devices also ...
2
votes
2answers
2k views

connect to wifi device with same SSID

I have an old wifi router which SSID is ASDF and password is 1234567890, I bought a new one when the old one broken and set the SSID and password to the old one's. Then I found that my Android phone ...
2
votes
0answers
96 views

802.11 Management Frame element decoding

An IEEE 802.11 Management Frame can contain multiple "Element" fields, which are effectively TLVs (a Type, a Length, and a Value). Other than Type 211 for "Vendor Specific", are there any Element IDs ...
2
votes
1answer
637 views

Code for broadcasting wifi packets without a network [closed]

Is it possible to send a packet over wifi without having joined any kind of network (ad-hoc or not)? I would like to be able to send packets in the air without joining a network. Another device in ...
3
votes
1answer
11k views

Difference Between Number of CPEs and Number of hosts

I have to extend the wifi range by using two wireless routers.First I will have to configure the DHCP settings in my primary router.But its setting mentions number of CPEs instead of Hosts.Do they ...
1
vote
2answers
425 views

What WIFI AP to broadcast 3 Mbps UDP stream?

CONTEXT: We are searching for WIFI AP able to broadcast UDP stream on a maximum number of connections: 10, 30, 50, 100, 150, 200 (guess the WIFI point is different in term of price and technology ...
1
vote
1answer
272 views

Probe Request frames in 802.11n

I have two questions about Probe Request frames in 802.11n: On which rate are Probe Request frames sent in 802.11n? Is it fixed in the standard, or can it be tuneable? Are Probe Request frames sent ...
1
vote
1answer
553 views

How to identify 100% eapol packet?

How can i 100% identify a eapol protocol packet? I saw a key descriptor type "EAPOL RSN Key" and many more. But how can i say 100% "okay this is eapol"? Is there one or two bytes in the packet to make ...
1
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1answer
2k views

Adding external omni directional antenna to Nanostation Loco M2

I bought a Nanostation Loco M2 which does not have an UFL to SMA(f) RP port for me to add an external antenna. I bought these UFL to SMA(f) RP cables and an external antenna but I am not sure where ...
0
votes
2answers
1k views

Clear Channel Assessment and sensitivity thresholds in WLAN 802.11ac

I have been learning about the WLAN technology and I couldn't understand the logic behind the choice of the Clear Channel Assessment thresholds protocol used in CSMA/CA: In 802.11ac for WLAN, a ...
0
votes
1answer
51 views

WiFi texting on a firewalled BGAN satellite link. How did this work? [closed]

I use an iSavi IsatHub for Internet connectivity when I'm in the backcountry out of cellular service. This device is a BGAN terminal and it works by establishing a data link with an Inmarsat satellite ...
1
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3answers
3k views

Why such a large discrepancy between theoretical and real Wifi speeds?

I am testing the actual speed of transferring a file from a network share. Over my 1 Gigabit Ethernet I get about 120 MB/s - that's 96% of the theoretical maximum. Over my old Wireless G I get about ...
2
votes
1answer
477 views

Decode promiscuous Wi-Fi Packets offline

I am using an embedded Wi-Fi module (ESP8266) to act as a logger to find devices that are using my LAN network. I can get this module to sniff Wi-Fi packets promiscuously, but now I need to decode the ...
1
vote
2answers
770 views

Is it a viable solution to increase Tx power of AP if network is crowded?

We are going to provide Wi-Fi (802.11b/g/n) to a small building with a dozen APs, one AP per room. The rooms are adjacent to each other. Each AP will independently have its own SSID protected by ...
2
votes
1answer
621 views

TCP MSS over WiFi

The MTU for 802.11 is 2296 bytes. Does this mean that if TCP is used over 802.11, the MSS can only be 2296 - 40 = 2256? Can't one use a higher MSS which would then get fragmented over 802.11? In ...
3
votes
1answer
890 views

What are the Korean DFS Radar Wi-Fi channels regulations? [closed]

I couldn't find the answer from Google search. The closest was: https://en.wikipedia.org/wiki/U-NII (The Unlicensed National Information Infrastructure (U-NII) radio band is part of the radio ...

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