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Apple added a very useful feature to macOS High Sierra for people like me, whose neighbor's wifi is stronger than my own. You can stop your Mac from auto-joining it without having to forget the network.
- Apr 03, 2014 There is a really good chance that on your Mac, the WiFi management section is the area you access most frequently. This is particularly true if you travel regularly and need to connect to different WiFi networks at different locations. You might find yourself switching between different WiFi networks, to use the one with the most signal strength.
- Sep 30, 2016 macOS Sierra has a built-in WiFi Scanner, making it easy for you to find the best WiFi channel to use for your network. If you’ve recently download macOS Sierra and want to figure out how to improve your WiFi, you have access to a free WiFi Scanner that can provide some useful information.
My next door neighbor is also one of my dearest friends. So, of course we've both signed into each other's network in the past. When she moved in next door, my internet connection started acting wonky because all of my devices were connecting to her network, which is way stronger than mine. I'd have to switch back to my own connection in order to use such features as AirPlay and controlling my smart lights.
That's all changed with iOS 11 and macOS High Sierra. Now, you can disable auto-joining of networks you are near. Here's how.
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How to disable auto-joining specific networks on Mac in High Sierra
To stop automatically joining a network, but still keep the login credentials disable it in your network settings.
True, my Mac cannot hold a WiFi connection, but that is only at home. At school, it works just fine. Also at home, when my Mac tries to connect, it disconnects all other devices from the WIFI and sometimes even those with ethernet connections stop working. I have a MacBook air from 2011 running 10.13.6 macOS High Sierra and Spectrum as my ISP. Sep 26, 2017 Apple added a very useful feature to macOS High Sierra for people like me, whose neighbor's wifi is stronger than my own. You can stop your Mac from auto-joining it without having to forget the network. My next door neighbor is also one of my dearest friends. So, of course we've both signed into each other's network in the past. Jul 31, 2017 On the top left, you will see four Keychains – login, iCloud, System, and System Roots.The one you want is “System“.So click on that. Find Your Wifi Network. If you look at one of the tables in the middle, you will see that one of the headers is called “Kind“.Click that until everything in that column moves into alphabetical order with the “a”‘s at the top.
You can quickly access your network settings from the drop down menu when you click on your wifi icon in the Menu bar.
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Or you can access your network settings in you system preferences.
- Click on the Apple menu icon in the upper left corner of your Mac's screen.
- Click on System Preferences.
- Click on Networks.
- Select the wifi network you want to stop joining automatically from the drop down menu next to Network Name. You have to be within range of the network to see it.
- Untick the box next to Automatically join this network.
You can repeat this process with all nearby wifi networks you can access, but don't want to automatically join.
How to enable auto-joining specific networks on Mac in High Sierra
If you change your mind and decide you always want your Mac to join a particular network, you can reenable auto-joining without needing the password again.
You can quickly access your network settings from the drop down menu when you click on your wifi icon in the Menu bar.
Or you can access your network settings in you system preferences.
- Click on the Apple menu icon in the upper left corner of your Mac's screen.
- Click on System Preferences.
- Click on Networks.
- Select the wifi network you want to automatically join from the drop down menu next to Network Name. You have to be within range of the network to see it.
- Tick the box next to Automatically join this network.
How to disable remembering all networks your Mac has joined
If you'd rather your Mac not store network settings for future access, you can disable the feature altogether. This will mean you'll have to reenter the wifi password every time you join a network, even if its one you've previously joined.
You can quickly access your network settings from the drop down menu when you click on your wifi icon in the Menu bar.
Or you can access your network settings in you system preferences.
- Click on the Apple menu icon in the upper left corner of your Mac's screen.
- Click on System Preferences.
- Click on Networks.
- Click on Advanced.
- Untick the box for Remember networks this computer has joined.
Your Mac will no longer remember networks automatically. You'll have to manually enable auto-join for specific networks you want to keep the login credentials stored.
Any questions?
Do you have any questions about disabling auto-joining wifi networks on your Mac in High Sierra? Put them in the comments and we'll help you out.
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For system administrators, macOS roaming helps your Mac stay connected as it moves between different places within your office network.
Trigger threshold
The trigger threshold is the minimum signal level a client requires to maintain the current connection.
macOS clients monitor and maintain the current BSSID’s connection until the RSSI crosses the -75 dBm threshold. After RSSI crosses that threshold, macOS scans for roam candidate BSSIDs for the current ESSID.
Consider this threshold in view of the signal overlap between your wireless cells. macOS maintains a connection until the -75 dBm threshold, but 5 GHz cells are designed with a -67 dBm overlap. Those clients will remain connected to the current BSSID longer than you expect.
Also consider how the cell overlap is measured. The antennas on computers vary from model to model, and they see different cell boundaries than expected. It's always best to use the target device when you measure cell overlap.
Selection criteria for band, network, and roam candidates
macOS always defaults to the 5 GHz band over the 2.4 GHz band. This happens as long as the RSSI for a 5 GHz network is -68 dBm or better.
If multiple 5 GHz SSIDs meet this level, macOS chooses a network based on these criteria:
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- 802.11ac is preferred over 802.11n or 802.11a.
- 802.11n is preferred over 802.11a.
- 80 MHz channel width is preferred over 40 MHz or 20 MHz.
- 40 MHz channel width is preferred over 20 MHz.
macOS doesn't support 802.11k. macOS does interoperate with SSIDs that have 802.11k enabled.
macOS selects a target BSSID whose reported RSSI is 12 dB or greater than the current BSSID’s RSSI. This is true even if the macOS client is idle or transmitting/receiving data.
Roam performance
Roam performance describes how long a client needs to authenticate successfully to a new BSSID.
Finding a valid network and AP is only part of the process. The client must complete the roam process quickly and without interruption so the user doesn't experience downtime. Roaming involves the client authenticating against the new BSSID and deauthenticating from the current BSSID. The security and authentication method determines how quickly this can happen.
First, 802.1X-based authentication requires the client to complete the entire EAP key exchange. Then, it can deauthenticate from the current BSSID. Depending on the environment’s authentication infrastructure, this might take several seconds. End users could experience interrupted service in the form of dead air.
macOS supports static PMKID (Pairwise Master Key identifier) caching to help optimize roaming between BSSIDs in the same ESSID. macOS doesn't support Fast BSS Transition, also known as 802.11r. You don't have to deploy additional SSIDs to support macOS because macOS interoperates with 802.11r.
Measure Client RSSI
macOS offers a few built-in tools that scan to measure RSSI.
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To learn the RSSI for the associated network, hold the Option key while you click the Wi-Fi menu.
To learn the RSSI for networks in the client’s environment, use Wireless Diagnostics. To open Wireless Diagnostics, Option-click on the Wi-Fi menu, select Open Wireless Diagnostic, and choose Scan. Click the Scan Now button to find all nearby wireless networks and measure their RSSI.
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In addition to this graphic tool, you can also use the command-line utility 'airport' to get the same data. This is found in /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/. The ‘-s’ flag scans the current environment for available networks and lists the RSSI.