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Is there a good bit of software on Mac OS X that I can use to monitor incoming and outgoing network activity? Nothing too geeky, I just want something simple to use.

I'm on version 10.6 (Snow Leopard) if that helps.

Peter Mortensen

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8 Answers

Wireshark is widely acknowledged as one of the best network monitor tools available. Distributions are available for OS X.

If you prefer something more simplistic you can use iStatMenus to show incoming / outgoing network traffic speeds.

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For the person who doesn't want to install anything you can also use tcpdump in Terminal.

Josh KJosh K

Also check out nettop, a little command line gem that ships with Mac OS.

Also look at MenuMeters. I tried iStat Menus & MenuMeters and preferred MM. Not saying one is better; just that there are a couple of choices.

A working version of MenuMeters for El Capitan can be found here.

LittleSnitch! - 30$

It is mainly a software Firewall that may help you to prevent some apps to access the internet. It also has a nice menubar icon with live network usage. Mouseover on it and it displays which app is communicating with which server or ip address.

I have LittleSnitch and iStat Menus installed. Both are complementary.

ArkoArko

Commercial (16$) iStat Pro and iStat Menus (dashboard widget and menu bar item respectively) are great for monitoring everything from network activity to CPU temperatures.

And of course there's the network tab of Activity Monitor.

sorin

Network Logger for Mac OS X from Group Mind does a great job of tracking network traffic, downtime (in real time, with timed log), and lots of easy-to-understand stuff. I'm not technical and all I really wanted was to track when my ISP connection went down, and for how long it stayed down. Mac's little Network Utility app would ping endlessly but wouldn't give me a chronological log. Network Logger did, and was easy for a novice to understand.

Cost me $5.99 from the App Store.

/System/Library/CoreServices/Network Diagnostics Simple green/red LEDs for various layers. I slide it over to the right side of the screen until just the lights show.

I've just installed Net Monitor and Net Monitor Sidekick and so far I like them. Nothing you can't get with other tools, but a nice summary display. Each is $10 after a 30 day eval, so YMMV, but I thought I'd mention them. Spam tool for mac email.

Not the answer you're looking for? Browse other questions tagged macosnetworkingbandwidth or ask your own question.

If you've followed the steps to connect your Mac to a Wi-Fi network, but the connection to your network or the Internet isn't reliable, the steps in this article might help.

Check for Wi-Fi recommendations

When your Mac tries to connect to a Wi-Fi network, it checks for issues that affect its ability to create a fast, stable, and secure connection. If an issue is detected, the Wi-Fi status menu in the menu bar shows a new item: Wi-Fi Recommendations. Choose it to see recommended solutions.

Wi-Fi recommendations are available in macOS Sierra or later.

Analyze your wireless environment

Your Mac can use Wireless Diagnostics to perform additional analysis.

1. Quit any apps that are open, and connect to your Wi-Fi network, if possible.
2. Press and hold Option (Alt) ⌥ key, then choose Open Wireless Diagnostics from the Wi-Fi status menu .
3. Enter your administrator name and password when prompted.

Wireless Diagnostics begins analyzing your wireless environment:

If the issue is intermittent, you can choose to monitor your Wi-Fi connection:

When you're ready to see recommendations, continue to the summary. Wireless Diagnostics asks for optional information about your base station or other router, so that it can include that in the report it saves to your Mac.

Click the info button next to each item in the summary to see details about that item. Wi-Fi best practices are tips that apply to most Wi-Fi networks.

Back up or make note of your network or router settings before changing them based on these recommendations—in case you need to use those settings again.

Monitor your Wi-Fi connection

Your Mac can monitor your Wi-Fi connection for intermittent issues, such as dropped connections. Follow the steps to analyze your wireless environment, but choose ”Monitor my Wi-Fi connection” when prompted.

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During monitoring, a window shows that monitoring is in progress. Monitoring continues as long as this window is open and you're on the same Wi-Fi network, even when your Mac is asleep.

If Wireless Diagnostics finds an issue, it stops monitoring and shows a brief description of the issue. You can then resume monitoring or continue to the summary for details and recommendations.

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Create a diagnostics report

Wireless Diagnostics automatically saves a diagnostics report before it displays its summary. You can create the same report at any time: press and hold the Option key, then choose Create Diagnostics Report from the Wi-Fi status menu . It can take your Mac several minutes to create the report.

• macOS Sierra and later saves the report to the /var/tmp folder of your startup drive, then opens that folder for you.
  To open the folder manually, choose Go > Go to Folder from the Finder menu bar, then enter /var/tmp.
• OS X El Capitan or earlier saves the report to your desktop.
  

The report is a compressed file with a name that begins “WirelessDiagnostics.” It contains many files that describe your wireless environment in detail. A network specialist can examine them for further analysis.

Use other diagnostics utilities

Wireless Diagnostics includes additional utilities for network specialists. Open them from the Window menu in the Wireless Diagnostics menu bar:

• Info gathers key details about your current network connections.
  
• Logs enables background logging for Wi-Fi and other system components. The result is saved to a .log file in the diagnostics report location your Mac. Logging continues even when you quit the app or restart your Mac, so remember to disable logging when you're done.
  
• Scan finds Wi-Fi routers in your environment and gathers key details about them.
  
• Performance uses live graphs to show the performance of your Wi-Fi connection:
  • Rate shows the transmit rate over time in megabits per second.
  • Quality shows the signal-to-noise ratio over time. When the quality is too low, your device disconnects from the Wi-Fi router. Factors that affect quality include the distance between your device and the router, and objects such as walls that impede the signal from your router. Learn more.
  • Signal shows both signal (RSSI) and noise measurements over time. You want RSSI to be high and noise to be low, so the bigger the gap between RSSI and noise, the better.
• Sniffer captures traffic on your Wi-Fi connection, which can be useful when diagnosing a reproducible issue. Select a channel and width, then click Start to begin capturing traffic on that channel. When you click Stop, a .wcap file is saved to the diagnostics report location on your Mac.

Learn more

Additional recommendations for best Wi-Fi performance:

• Keep your router up to date. For AirPort Time Capsule, AirPort Extreme, or AirPort Express Base Station, check for the latest firmware using AirPort Utility. For non-Apple routers, check the manufacturer's website.
• Set up your router using Apple's recommended settings, and make sure that all Wi–Fi routers on the same network use similar settings. If you're using a dual-band Wi-Fi router, make sure that both bands use the same network name.
• Learn about potential sources of Wi-Fi and Bluetooth interference.

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Learn about other ways to connect to the Internet.