A "trace route" diagnosed the problem immediately connection attempts from Louisville to the California-based cloud server were being dropped in Salt Lake City. A support call to the cloud services provider quickly confirmed that the cloud services were operating properly the problem was somewhere else. No Mac within the client's office could connect to the cloud-based server. Such scenarios can prove maddening.įor example, a client once experienced difficulty connecting to a critical cloud-based service. One of the more trying network failures to diagnose and repair is failed network connectivity outside the organization. By default OS X Mountain Lion labels the wired network interface en0. It should be noted, too, that all the ipconfig options work with OS X's wired network interface, too. The router address is listed toward the very end. The getpacket option returns much information. To determine the router and DHCP information supplied to a Mac's network interface, enter this command: ipconfig getpacket en1 To determine the DNS server a Mac's network interface is set to leverage, enter this command: ipconfig getoption en1 domain_name_server To display a Mac network interface's subnet mask, enter this command: ipconfig getoption en1 subnet_mask To display a Mac network interface's IP address (for the wireless network interface, denoted by en1), enter this command: ipconfig getifaddr en0 Apple does not recommend using the OS X ipconfig command for any purpose other than debugging and testing.
DEFAULT PROGRAM THAT MANAGES WIRELESS NETWORK CONNECTIONS FOR MAC OS X WINDOWS
However, it may be better for users and administrators familiar with the Windows ipconfig command to think of the OS X ifconfig command as the Windows' ipconfig counterpart. The command can also configure network settings. The ipconfig command enables displaying such critical Mac network interface information as the LAN IP, subnet mask, DNS servers, and router (often the DHCP server source) information. The en1 network interface, meanwhile, serves as the wireless network interface on newer OS X systems, by default. For example, the following command assigns a LAN IP address of 192.168.1.2 to interface en0 (the wired Ethernet port on my MacBook Pro) using a subnet mask of 255.255.255.0: ifconfig en0 inet 192.168.1.2 netmask 255.255.255.0 The ifconfig command also enables assigning a specific IP address to a specific network interface. In addition to revealing each network interface's MAC address, ifconfig reveals each network interface's active IP address, hexadecimal netmask, and media duplex status. Users and administrators new to the ifconfig command should begin simply by familiarizing themselves with the wealth of information the basic ifconfig command returns when entered from the OS X Terminal. Numerous ifconfig command options are available, and most are well beyond the scope of such an overview as is found here. Use the hostname command to confirm the system's computer name. The ifconfig command reveals critical information regarding a Mac's network interfaces, whether the network interface is a wired or wireless connection. They are ifconfig, ipconfig and traceroute.
Three critical network commands, however, potentially provide the most powerful network diagnostic and troubleshooting assistance. As previously reviewed, the Mac command line helps unlock the power of the command line, enter basic directory commands, navigate the Mac shell, simplify networking and more. The Mac Terminal, of course, provides direct access to the underlying OS. As Mac users and administrators develop greater skill and experience, however, they typically graduate to seeking specific Terminal commands to more quickly diagnose and repair network errors. The Mac's Systems Preferences Network applet enables configuring network settings, while the Network Utility (found within Applications\Utilities) provides a graphical interface for troubleshooting network errors.
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