With the bulldozer tool (N) active, you cannot choose build items (such as walls) from the menu. If you click on the menu item, it immediately selects-deselects the item. You have to escape out of the menu before you can choose the item again. Oct 13, 2013 I have tried adding Airport through System Preferences Network and clicking plus button but Airport is not in the dropdown list. More Less Mac Pro, OS X Mountain Lion (10.8.4). The AirPort Extreme is a residential gateway combining the functions of a router, network switch, wireless access point and NAS as well as varied other functions, and one of Apple's former AirPort products. The latest model, the 6th generation, supports 802.11ac networking in addition to.

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Apple's AirPort Software Base Stationis a program that turns a Mac OS 9.x computer into a Wireless Access Point.It requires a Mac OS 9.x computer that has an Internet connection (either dial-up (modem)or Ethernet), and an Apple AirPort Wireless card.It shares the single Internet connection with a number of clients; the clientscommunicate with the Software Base Station viawireless networking and/or Ethernet wiring.

The program is not available for Mac OS X.(Equivalent functionality is supposed tobe available using Mac OS X's Internet Sharing feature,available starting in Mac OS X version 10.2.However, that software contains serious bugs that can interfere with the campus network.)

Do not confuse the Apple AirPort Software Base Station (a program that runs on a Macintosh computer) withApple's AirPort Base Station; the latter is a standalone hardware device.The information in this document applies only to the software version.

The information in this document applies only to Apple AirPort Software Base Stationsoftware running on a Macintosh computer attached to the campus network via the Mac's Ethernet port.This document does not apply to AirPort Software Base Station softwarerunning on a Macintosh computer attached toa network via the Mac's modem (telephone) port.

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While Apple's AirPort Software Base Station is not a product that OITexplicitly supports for on-campus use,we anticipate that some on-campus customers will run this programas a means to create private wireless networksattached to the campus wired network.

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The purpose of this document is to describe important steps that mustbe taken (by the person responsible for the Macintosh on which the program runs)to prevent the program from interfering with the operation of the campuswired and wireless networks.

Our intent is not to fully document the configuration and use ofthe Apple AirPort Software Base Station; we assume that the owner will reviewthe documentation provided by the vendor.This document is focused on just those particular issues specificto running this program on Princeton University's campus network.

The Basics

Before proceeding, be sure you are familiar withConnecting a Private Wireless Access Point to the Campus Network.

The Apple AirPort Software Base Station always functions as a NAT; itcannot be configured to function as a bridge.Therefore, be sureyou are also familiar withConnecting a Private Network Address Translator to the Campus Network.

The program includes an embedded DHCP server.It will provide NAT and DHCP service to the private network createdby the Mac's wireless interface.As documented below, it must be configured so that it does not serve the Mac's Ethernet interface.

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The Macintosh computer on which you will run the software must be subscribedto Dormnet or registered in the Host Database.No special steps must be taken when registering the Macintosh computer;it is registered simply as a normal HOST.(It is not registered as a NAT, because it is not a dedicated NAT.It is is a host that also acts as a NAT.)

Naturally, if you enable the AirPort Software Base Station, thenyour Mac can no longer use its wireless card to connect towireless networks.(After all, the wireless card is now being used to create a newprivate wireless network to which other wireless clientsmay connect.)

Configure the AirPort Software Base Station Software

Configuring the Software Base Station is performed using Apple's 'AirPort' program on the Macintosh. (This is the same program that may be used to configure the Mac's AirPort card.)At the time of this writing,the current version of this program isversion 2.0.4; if you do not have this program on your Macintosh, or you have anolder version, obtain the current version from Apple before proceeding. (It isincluded as part of a software package named AirPort 2.0.4.) You can download it from Apple.(Depending on your Mac, you may also be able to retrieve it fromApple using your Mac's 'Software Update' Control Panel.)

(Apple also provides another program called'AirPort Setup Assistant' to configure the software base station. Do not use that program to configure the Software Base Station;it may not configure itappropriately for use on the campus network.)

Follow Apple's instructions for configuring the Software Base Station(which are not repeated here), but with the following caveats:

  1. On the 'Start/Stop' tabbed pane, you will specify the'network name' that will be usedfor the private wireless network created by your Software Base Station.

    The name you enter here is the wireless network name (a.k.a. 'SSID')that wireless clients see, and select to join your private wireless network.

    We recommend you name your wirelessnetwork after the hostname registered for your Macintosh.For instance,if your Macintosh is registered as jxydoe.student.princeton.edu,then make your wireless network name jxydoe.student or perhaps jxydoe's network.Using the same name as your Mac's hostnamewill help identify the wireless network to anyone who stumbles across it,and may be helpful for diagnostic purposes.

    Be sure that you do not specify puwireless as your network name.That wireless network name (a.k.a. SSID) is reserved for use by OIT Wireless Service;if you were to name your private wireless networkthe same way, it would confuse clients who stumble across it, andcould cause difficulty for users of OIT's service.

  2. In the 'Network' tabbed pane,do not check the 'Also support Ethernet client computers using NAT' checkbox.

    Enabling this would cause your Mac to also act as a NAT on its Ethernet interface.That is not appropriate as your Ethernet interface is attached to the campus network.You should only be serving clients on your wireless interface (i.e. your privatewireless network).

  3. While not required, we strongly recommend that youlimit the wireless clients that may connectto your private wireless network. (Recall fromConnecting a Private Wireless Access Point to the Campus Networkthat you bear some responsibility for the activity of any clientsof your AirPort Software Base Station, even if they connect without your explicit permission.)

    You may choose to limit access in either (or better yet, both) of two ways:

    • On the 'Access Control' tabbed pane,specify the wireless hardware address of each client that may connect.(The proram calls the wireless hardware address an 'AirPort ID'.)

      You should be aware that this does not guarantee that other clients cannotassociate to your AirPort Software Base Station. It is still possible for unscrupulousindividuals to configure a wireless client to spoof another's wireless hardwareaddress. It just adds another small obstacle for them to overcome.

    • On the 'Start/Stop' tabbed pane, turn on the'Enable encryption (using WEP)' checkbox, thenclick the 'Change Network Password...' button tospecify a password for your wireless network.Each wireless client that wishes to connect to your wireless network willhave to enter this WEP password each time it connects.(Do not specify the same password you use for any other system or computer account.It is not difficult for anunscrupulous person to discover your wireless network's password by 'snooping' on its radio transmissions.)

      Note that some wireless clients may not support WEP, so this feature is notpractical unless all the clients of your wireless network support WEP.

      Note also that WEP is not considered to be strong encryption, and in fact,WEP technology has been 'cracked.'You should not assume that the use of WEP provides you with strong privacy,access control, or integrity.At best, it adds a level of inconvenience to dissuade unwelcome guests from attempting toaccess your private wireless network.Still, each obstacle you add to prevent unauthorized use of your private wirelessnetwork may be helpful.

No Support

Although this document discusses the Apple AirPort Software Base Station,it should not be construed as a statement of OIT support for the program,or for the construction of private wireless networks.

We have published this document because we expect some customers will runthis product on Macintosh computers attached to the campus network; unless running with appropriateconfiguration,the program can interfere with the operation of the campus wired and wireless networks.The instructions in this document are intended to document the steps necessary to preventsuch problems.

OIT does not support your Apple AirPort Software Base Station, or theprivate wireless network it provides.You are responsible for operating the program in away that does not interfere with the operation of OIT's wired and wireless networks.If you cannot configure it to operate in such away, you will have to disable the program.

A service ofOIT Network Switching and Routing
The Office of Information Technology,

Mac Os Download


Princeton University
Last Updated: September 30 2002

macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.

Check compatibility

macOS Big Sur is compatible with these computers:

MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.

If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.

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Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS Big Sur

If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.

Begin installation

After downloading, the installer opens automatically.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Stay up to date

After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. You can also use Software Update to check for updates: Choose Apple menu  > System Preferences, then click Software Update.

Or get macOS Big Sur automatically

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If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Big Sur will download conveniently in the background, making it even easier to upgrade. A notification will inform you when macOS Big Sur is ready to be installed. Click Install to get started, or dismiss the notification to install later. When you're ready to install, just open the file named Install macOS Big Sur from your Applications folder.

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Learn more

  • If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
  • For the strongest security and latest features, upgrade to macOS Big Sur. If you have hardware or software that isn't compatible with Big Sur, you might be able to install an earlier macOS.
  • You can also use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.
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