WiFi is a layer 1 and 2 networking protocol for wireless communication between devices. It is typically used in local networks for client access, but can also be used in point-to-point network links. WPA is used to encrypt traffic.

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45answers
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Why is Internet access and Wi-Fi always so terrible at large tech conferences? [closed]

Every tech conference I've ever been to, and I've been to a lot, has had absolutely abysmal Wi-Fi and Internet access. Sometimes it's the DHCP server running out of addresses. Sometimes the backhaul ...
20
votes
22answers
3k views

Leaving my wifi open for the world

For my home I want to be a nice neighbor actually I have let my wifi open for the past maybe 6 or 7 years. I know that WEP, etc can be cracked within a couple of minutes but my neighbors son who works ...
20
votes
3answers
1k views

Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, ...
19
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4answers
1k views

Do wifi packets go directly node to node?

I have two nodes on a wireless network. Node A is streaming data to node B. Most of the time it works fine, but sometimes there is packet loss and the stream is interrupted. To improve performance ...
18
votes
4answers
521 views

Long Distance Networking Options

What would be the best way to connect two freestanding farm buildings onto the same network? The total cable length would be less than 1000 feet. Cat6 is listed as having a max length of about 330', ...
15
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9answers
7k views

Who's using our bandwidth?

I can see from our ISP stats that a large amount of bandwidth is being used throughout the day, I suspect it's someone using our wireless router although I'm not definite. Our PC's all run various ...
15
votes
8answers
577 views

Building a LAN on in the woods

A very long time ago, I had to build a LAN for a bunch of laptops, in a couple of tents. We ended up bringing a bunch of generators, stringing about 2 miles of networking and power cables, and ...
14
votes
12answers
1k views

corporate network: wireless vs wired

Our office is getting a serious make over and we are looking into updating our network infrastructure. My idea was to just update our current cat5e cables to cat6 but my boss (not an IT guy) doesn't ...
14
votes
2answers
1k views

Serving 10,000 simultaneous users over Wifi

I'm looking to offer a wifi service at a public event. The traffic will be very minimal, 10KBps should be adequate. Users don't necessarily need to connect to anything other than the private intranet. ...
14
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3answers
2k views

Slowest wireless client dictates the connection quality of all others?

Not sure if this is the place to ask this, but I couldn't find a more appropriate StackExchange site. I heard that the quality of wireless connection follows the law of the lowest common denominator - ...
14
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1answer
8k views

WEP/WPA/WPA2 and wifi sniffing

I know that WEP traffic can be "sniffed" by any user of the WIFI. I know that WPA/WPA2 traffic is encrypted using a different link key for each user, so they can't sniff traffic... unless they ...
13
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5answers
1k views

How can I split my personal network (with WIFI) from my office network?

I work from my home home office and have a VPN router to my company. I share the same network for my personal and office use. I have a WiFi Access Point, I don't want access to any of my company ...
12
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2answers
20k views

Setting up multiple wireless access points on same network

I'd like to add wireless to my network, and I need multiple access points to cover the whole area. I'd like to set them up so that there's only one "wireless network" that the clients see, and it ...
12
votes
2answers
620 views

Wireless link frequency choice (900Mhz vs 5.8Ghz) for 2-3km distance

I have recently been contracted by a client of mine to facilitate the wireless communication of his "home" offices and a secondary site. The primary site is the top two floors of a 5-story office ...
12
votes
4answers
306 views

How do you troubleshoot wireless woes?

Sometimes I have to troubleshoot machines on my LAN which have flaky wireless connections without any seemingly logical reason. Contrary to "normal" network connections in most cases I don't know ...
12
votes
2answers
923 views

arp-requests cannot be seen by specific nodes

I create an open ad-hoc wlan by using iwconfig (I have the same issue with wpa_supplicant as well). there are 4 nodes on the network as seen on the figure below. The nodes run ubuntu 12.04 and debian ...
11
votes
13answers
7k views

Why would wireless routers become less reliable over time?

I've been curious about this for awhile now. I don't know if I'm seeing a real pattern or not, but having worked with many home office/small office wireless routers for a few years now, I've noticed ...
11
votes
5answers
12k views

What is the maximum length of a wifi access point's SSID?

I was wondering if anybody knew what the maximum string length of a browser's SSID is or where I could go to look for that sort of information. (From a spec of some sort)
11
votes
2answers
3k views

Connecting two laptops through wireless adapters without wireless router

I want to connect two laptops through their wireless network adapters. I dont want to use any wireless router or access point. How can I do that. Both are running windows xp, where one has sp2 and ...
11
votes
3answers
14k views

What happens when wifi channels overlap?

There are many pages on the web advising the use of wifi channels 1, 6 and 11 only, so that your wifi channels don't overlap. Obviously this makes sense when you only have your network do deal with, ...
10
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3answers
1k views

Security considerations of WPA versus WPA2?

As we replacing our existing WEP infrastructure across multiple offices, we are weighing the value of upgrading to WPA versus WPA2 (both PSK). We have several different types of devices that do not ...
10
votes
4answers
45k views

What's the maximum number of wifi connections for a single WiFi router?

We've got a Draytek 2829VN Wifi router and I'm wondering how many concurrent connections I should expect a router of this kind to cope with? We are looking to connect 60 iPads! I'd also be ...
10
votes
2answers
353 views

Wireless Backhaul - How to plan and test Point-to-Point feasability in potential antenna locations?

Our organization has begun to seriously consider replacing many of our interconnects with wireless backhauls, meshes or generic point-to-point links as the situation warrants. Our current method of ...
10
votes
4answers
668 views

What to filter when providing very limited open WiFi to a small conference or meeting?

Executive Summary The basic question is: if you have a very limited bandwidth WiFi to provide Internet for a small meeting of only a day or two, how do you set the filters on the router to avoid one ...
9
votes
4answers
373 views

Wireless Signal Strength + Performance

We have two access points on the shop floor. One of the AP's is not performing correctly with erratic signal strength and connectivity. Are there any open source tools available to measure performance ...
9
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4answers
10k views

Questions about overlapping wifi access points

I have a few questions about wifi. Say we have a small campus with a set of wifi access points in most buildings, one each for channels 1, 6, and 11. It's not exactly that clean, but that's the ...
9
votes
1answer
949 views

Configuring WPA2-Enterprise with Freeradius

I'm trying to set up an authenticated wifi network with Freeradius. I've managed to get things working using self-signed certs etc. The problem is Windows clients need to uncheck the "Automatically ...
8
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2answers
1k views

Industry standard for minimum Wifi signal strength?

Is there an industry standard for how strong a Wifi signal needs to be in order to have a reliable connection? For example, maybe Wifi endpoints are designed to the specification that they connect ...
8
votes
2answers
7k views

Beginners questions on how RADIUS and WiFi authentication works

I am a network admin at a high school in South Africa, running on a Microsoft network. We have approximately 150 PCs around the campus, of which at least 130 are wired to the network. The remaining ...
8
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3answers
658 views

Load testing wireless LANs

Anyone have any suggestions for methods of load-testing wireless networks for enterprise network deployments? We've got a wide array of different wireless worst-case scenarios to support. rooms ...
7
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9answers
2k views

LAN Between Buildings

Right now I have two buildings across the street from one another that both have typical consumer aDSL connections (something like 12 Mbs down/1 Mbs up). When I need to access resources on the other ...
7
votes
5answers
1k views

How can I set up a single wireless network through a number of WIFI routers?

I need to set up wireless access for my company headquarters. We live in a 4 story building and all 4 floors need to be covered. Currently I have 4 WIFI routers (Checkpoint SBOX, combined FW+router), ...
7
votes
2answers
14k views

RTS threshold, fragmentation, and other advanced WiFi settings

Background: I'm in a noisy environment, and I'm trying to optimize my WiFi network to have a more stable connection for the somewhat high volume of users (~50-75 on a busy day). There are 4 APs, and ...
6
votes
9answers
9k views

WEP or WPA what should I use for my WiFi networks connection

Which protocol should I use and why?
6
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4answers
338 views

Wireless technology - which is better: more single radio APs or less dual radio APs?

We are currently talking to vendors of wireless solutions for a wireless deployment in a university campus with some 5000 students. One vendor is offering us a Cisco solution with a WLC 5508 ...
6
votes
4answers
359 views

How secure are wireless networks?

If I'm on an open wireless network, can a 3rd party capture packets and see all the internet traffic to and from my computer? What if WPA encryption is used, but someone has the key already? If I use ...
6
votes
1answer
345 views

Small WiFi Network In a Noisy Environment

My company is demoing our network enabled products at big conferences. For this purpose, we would like to be able to set up a small WiFi network in our booth with a range of less than 10 meters. We ...
6
votes
4answers
13k views

Is there an equivalent command for 'init.d/networking restart' in OS X

From time to time, I've encountered issues with OS X clients' network connections (Wired and Wireless, Leopard/Snow Leopard) where nothing will fix the issue, until you reboot. Is there a ...
6
votes
2answers
162 views

wireless between 2 buildings

I am setting up a wireless LAN between two buildings -- one with Internet and one without. The distance between the buildings is about 900 feet. This goes across a 4 lane street and up/down a hill. ...
6
votes
4answers
5k views

How is it possible that I can do a host lookup but not a curl?

Has anyone ever seen this before? Note that this happens not only with google.com, but with every domain I try. It's a wireless connection (WEP), but I'm not sure how that would be relevant: $ curl ...
6
votes
1answer
596 views

WPA2 Enterprise without a Client-End Certificate

This question is practically identical to this question, but the difference being that the authentication server is freeRADIUS on Ubuntu and the access-points are DD-WRT. Additionally, I would like ...
6
votes
1answer
4k views

Connect to multiple AP with one Wifi adapter under Linux/FreeBSD?

How can I connect to more than one Wifi access point simultaneously using a single wireless adapter? I'm currently using pfSense as my home router and I want it to connect to multiple APs wirelessly. ...
6
votes
2answers
2k views

VLAN for WiFi traffic separation (new to VLANing)

I run a school network with switches in different departments. All is routed through to a central switch to access the servers. I would like to install WiFi access points in the different departments ...
6
votes
2answers
4k views

How to achieve automatic roaming between two Cisco Aironet access points?

I have two Cisco Aironet 1141 access points covering an office; the access points are configured identically (each of them with two SIDs) and are fully working; they are standalone access points, not ...
6
votes
3answers
427 views

Corporate Wireless policies

Our corporate laptops are restricted to only allow internet access through our proxy (connection profile in Internet Explorer pushed through a GPO). On a remote/3rd party connection this is allowed by ...
5
votes
5answers
866 views

Wireless health risks: any proof of it being a threat? Do you take it into account?

The Internet is full of "Tin foil hat" kind of people who would not dare to use a wireless setup, but as the amount of wireless networks grows, I am interested in good and objective case studies and ...
5
votes
10answers
1k views

Very strange home router problem [closed]

For a long time now I've had a very strange problem with my wi-fi network at home. I have a BT Voyager 2100 ADSL modem and an iMac, ageing PowerBook and a PC that connect to it wirelessly. The problem ...
5
votes
8answers
20k views

Is it possible to find the physical location of a wireless router based upon the broadcast signal?

Say for instance, a longitude and latitude? The only information available would be that it is an available wireless network in range (secured or unsecured).
5
votes
4answers
958 views

Why do some Wireless Access Points cost so much more than others?

Here are three different Wireless Access Points with similar specs: $875 CISCO AIR-AP1252AG-A-K9 Wireless Access Point $150 NETGEAR WNAP210-100NAS Prosafe Wireless Access Point $49 TP-LINK ...
5
votes
2answers
3k views

Why my laptop sends ARP request to itself?

I have just started to learn about protocols. While studying the packets in wireshark, I came across a ARP request sent by my machine to my own IP. Here is the details of the packet : No. Time ...