University of Oregon

WiFi Bug Fixes (Mac OS X 10.8 Mountain Lion)


Some Mountain Lion (OS X 10.8) users have found that their WiFi connection is somewhat unpredictable. Their network connections will drop at random. This article provides 2 fixes for this; fix #1 will add a new network location and renew DHCP, and fix #2 will change MTU size to prevent dropped connections.

* If there appears to be no Airport (also known as a wireless or WiFi) card installed on your computer, use Fix #3. if you are not experiencing this problem, do not use Fix #3.

Fix #1

1. Open System Preferences and select Network preferences.

2. Pull down the Location menu and choose Edit Locations...

3. Click the + button, name the new location and click Done.

4. to renew the DHCP Lease click the Advanced... button in the bottom right corner of the screen.

5. Select the TCP/IP tab at the top of the window.

6. Configure IPv4 should be set to Using DHCP. Select Renew DHCP Lease.

7. Click Apply and the appropriate settings will be renewed.

Fix #2

1. Open System Preferences and select Network preferences.

2. Click the Advanced... button in the bottom right corner of the screen.

3. Select the Hardware tab at the top of the window.

4. Pull down the Configure menu and set it to Manually.

5. In the MTU pull down menu, select Custom and set the field to 1453.

6. Click OK and close System Preferences.

Fix #3

Use this fix ONLY IF you do NOT have an Airport (also known as a wireless or WiFi) card installed in your computer. Most Macintoshes have Airport cards installed.

1. Open the Finder by clicking the Finder icon in the doc or by clicking on the desktop.

2. In the menu bar at the top of the screen, select Go, then Go to Folder...

3. Type this exactly (if copy and paste will leave less room for error for you, use that method):


Then click Go.

4. Move the file into the Trash. You will have to enter your computer password.

* You may have to try emtying the trash and/or restarting your computer in order for the change to take effect.