When it comes to helping you troubleshoot wireless networking problems, Mac OS X can't seem to make up its mind. The old Network Utility was appropriate primarily for network gurus. OS X 10.4 came with Network Diagnostics, which took a user-friendlier hand-holding approach. Lion added Wi-Fi Diagnostics, but hid it away; it was largely intended to be used by AppleCare technicians or Apple Store Geniuses, who’d use it to generate detailed log reports. Now Mountain Lion comes with a network tool—a revised version of Wi-Fi Diagnostics—that’s once again intended for regular end users, not just network experts.
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Wi-Fi Diagnostics can help you figure out why your Mac’s Wi-Fi adapter isn’t connecting to a network. It can also find nearby networks (which in turn can be useful for tracking down interference problems) and services broadcasting their availability via Bonjour. It also offers a graphical front end to some common Unix network tools, much as Network Utility did, but in a form that those without command-line experience can use.
To launch Wi-Fi Diagnostics, hold down the Option key as you click on the Wi-Fi icon in the menu bar. That’ll open the Wi-Fi menu with an Open Wi-Fi Diagnostics item at the bottom; click that item to open the utility. You can also launch the program directly from its hidey-hole: In the Finder, choose Go > Go to Folder, and enter
/System/Library/CoreServices/ . You’ll find the Wi-Fi Diagnostics app in there.
However you open it, you’ll see a welcome window with three options: Create Diagnostic Report, Turn on Debug Logs, and Capture Network Traffic. For your troubleshooting purposes, you can ignore all three and instead choose File > Network Utilities (or press Command-N).
The Network Utilities window provides four separate tabs that are each useful in their own way. Let’s go through them one at a time.
Performance
The Performance view tracks the wireless connection between your Mac and the base station to which it’s connected. The top chart, Signal Strength, shows the relative quality of the connection, while the bottom, Network Traffic, shows bytes passing back and forth. https://ameblo.jp/taulumertio1984/entry-12630952064.html. Together, these charts can help you figure out the optimum place to connect to a network or to troubleshoot dead spots in your home or office.
On the Signal Strength chart, the upper yellow line shows the power of the signal being received from the base station while the lower green line shows noise. The further these two lines are from each other, the greater the throughput you will receive. The higher the signal level, the stronger the signal.
Noise often remains constant; if you walk around your home or office with your laptop, that line may not change at all. The yellow signal line is more responsive, and you can watch it change as you move around (or walk between a computer and the direct path to a base station).
The Network Traffic chart below may be less useful than the Signal Strength chart, because it just shows the quantity of data being transferred over your Mac’s wireless connection. But it can tell you whether any data is getting through.
Wi-Fi Scan
The Wi-Fi Scan view shows the results of a scan of the surrounding networks, presenting as much detail about each as it can without actually connecting. The scan can be updated by selecting Active Scan or Passive Scan from the Scan pop-up menu in the lower left; it also updates periodically without intervention. (An active scan may find more networks that broadcast less or no information about themselves.)
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Bonjour
The Bonjour tab reveals the services that Bonjour-compatible devices around you are advertising. Each entry shows a particular service, such as iTunes Sharing, and the Bonjour-style address in URL form to reach it. Double-click one of those entries, and OS X will launch the corresponding program and attempt to open that URL.
The Bonjour view provides “negative” knowledge, as well as positive: You can see which devices are talking, but also, by inference, which ones aren’t on the network.
Tools
The Tools tab gives you a graphical interface to a bunch of common networking diagnostic tools; many of them are also found in Network Utility, but in a much less friendly form.
The tools include
ping and ping6 for checking whether a remote system is responsive; netstat which provides (exceedingly technical) details about connections in progress by a computer’s network adapter; and whois, which looks up domain registration information.
The gear menu changes contextually based on which of command is selected. With ping, for instance, you can pick the number of pings (attempts to test for a machine being alive) as well as the time-gap between them and the size of the packets used in those attempts. With lookup, which pulls down domain name system (DNS) records, you can type in a domain name and select Mail Exchanger (MX) to retrieve which mail servers handle messages for that domain.
While you may not spend a lot of time diagnosing wireless connectivity issues, it’s nice to know that there’s a tool that regular mortals—not just network nabobs—can understand. If nothing else, it’ll make it easier to get help when you can explain to someone else exactly what’s going—or not—on your wireless net.
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OS X: Want to know how good your Wi-Fi network really is? If you have OS X 10.7 or above (Lion or Mountain Lion), a handy but hidden built-in utility can monitor your network's performance and show your network's signal strength.
OS X Daily has posted the instructions for running the Wi-Fi Diagnostics tool. First, we have to find it. You can either go to the folder /System/Library/CoreServices—or, better yet, hold down the option key while clicking on the Wi-Fi icon in your menu bar and select 'Open Wi-Fi Diagnostics..'
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Open the tool (if you browsed for it by folder, you can copy the app to your Utilities folder or Dock first).
Update: For Mountain Lion users only: Ignore the first screen and hit Command+N to open the 'Network Utilities' window. Then Hit 'Wi-Fi Scan' and you'll be presented with a list of all the networks near you—even ones that are hidden, as well as their channel, security, and signal and noise levels.
For Lion users Use the Monitor Performance tool on the front screen and hit Continue. You'll also get a list of networks and the signal/noise info. (More screenshots at Technorati.)
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If you have competing networks on the same channel, you could possibly improve your reception by changing your channel on your router to one that's not used.
Technorati also explains how to tell if you have a good Wi-Fi signal:
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The 'Signal' number specifies the signal strength between your Mac and the Wi-Fi access point or router. The higher this number is, the better. But note that these are negative numbers so a Signal of -60 is higher (and stronger) compared to a Signal of -80. The Noise number represents the amount of wireless noise that can interfere with the Signal. In this situation, we want lower numbers. So again, because we have negative Noise numbers, a Noise level of -94 is better than one of -90.
Finally, we can take the Signal and Noise numbers to come up with a Signal-to-Noise ratio (SNR) for our wireless connection. So for example, If I have a Signal level of -60 and a Noise level of -91, the difference between these two numbers is 31. The higher the SNR is, the better the Wi-Fi performance will be. Typically a SNR of 25 or higher will give you great Wi-Fi performance.
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Click on the Performance tab if you're using Mountain Lion to see a chart of your live signal strength and noise meter (as well as network traffic). Basically, the wider the gap between the yellow and green lines, the better.
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This could help you decide on if you need to do some adjustments to boost your Wi-Fi, such as moving your router to a different location or making your own antenna booster.
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https://ameblo.jp/setzcedafma1976/entry-12630953497.html. Wi-Fi Scanner Tool is New in Mac OS X Mountain Lion, Here's How to Use it | OS X Daily
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