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How to get IP of computer assigned by DHCP?

 
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Old 01-13-2014
How to get IP of computer assigned by DHCP?
I have a computer at work with no control over the network settings. We have to pay for a static IP so that won't happen. I'm running an SSH server so I can connect back and analyze data when I'm sitting in boring classes.

I want to know how to get the IP of this machine when I'm on the same network.

Previously what I would do is either grab it before I leave the office, or I set up a script in mail that would email me the IP address if I sent a very specific e-mail to myself.

I'm not very good with networking, and to make matters worse, I'm on an iPad with no true access to a console.

No, this is not illegal, I'm friends with the IT guy on the floor, and he says it's perfectly fine. However, I don't think running a network scan would go unnoticed.

So, what is the best way to do this? My e-mail script only works if the computer isn't asleep, and it especially doesn't work if I forget what to e-mail myself.

Any help?

I could potentially connect to my home server, VPN into the network, then run a bash script that looks for my server but... I don't think that's a great idea.
 
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LEARN ABOUT MOJAVE

systemsetup

SYSTEMSETUP(8)						    BSD System Manager's Manual 					    SYSTEMSETUP(8)

NAME

     systemsetup -- configuration tool for certain machine settings in System Preferences.

SYNOPSIS

     systemsetup [-getdate] [-setdate mm:dd:yy] [-gettime] [-settime hh:mm:ss] [-gettimezone] [-listtimezones] [-settimezone timezone]
		 [-getusingnetworktime] [-setusingnetworktime on | off] [-getnetworktimeserver] [-setnetworktimeserver timeserver] [-getsleep]
		 [-setsleep minutes] [-getcomputersleep] [-setcomputersleep minutes] [-getdisplaysleep] [-setdisplaysleep minutes]
		 [-getharddisksleep] [-setharddisksleep minutes] [-getwakeonmodem] [-setwakeonmodem on | off] [-getwakeonnetworkaccess]
		 [-setwakeonnetworkaccess on | off] [-getrestartpowerfailure] [-setrestartpowerfailure on | off] [-getrestartfreeze]
		 [-setrestartfreeze on | off] [-getallowpowerbuttontosleepcomputer] [-setallowpowerbuttontosleepcomputer on | off]
		 [-getremotelogin] [-setremotelogin on | off] [-getremoteappleevents] [-setremoteappleevents on | off] [-getcomputername]
		 [-setcomputername computername] [-getstartupdisk] [-liststartupdisks] [-setstartupdisk path]
		 [-getwaitforstartupafterpowerfailure] [-setwaitforstartupafterpowerfailure value] [-getdisablekeyboardwhenenclosurelockisengaged]
		 [-setdisablekeyboardwhenenclosurelockisengaged yes | no] [-getkernelbootarchitecturesetting]
		 [-setkernelbootarchitecture i386 | x86_64 | default] [-version] [-help] [-printCommands]

DESCRIPTION

     The systemsetup command is used to configure certain per-machine settings typically configured in the System Preferences application.  The
     systemsetup command requires at least "admin" privileges to run.

     A list of flags and their descriptions:

     -getdate
	     Displays the current date.

     -setdate mm:dd:yy
	     Use this command to set the current month, day, and year.

     -gettime
	     Displays the current time in 24-hour format.

     -settime hh:mm:ss
	     Sets the current time. The provided time argument should be in 24-hour format.

     -gettimezone
	     Displays current time zone.

     -listtimezones
	     Lists all time zones supported by this machine.

     -settimezone timezone
	     Use this command to set the local time zone. Use "-listtimezones" to list valid timezone arguments.

     -getusingnetworktime
	     Displays whether network time is on or off.

     -setusingnetworktime on | off
	     Sets whether using network time is on or off.

     -getnetworktimeserver
	     Displays the currently set network time server.

     -setnetworktimeserver timeserver
	     Use this command to designate a network time server. Enter the IP address or DNS name for the network time server.

     -getsleep
	     Displays amount of idle time until machine sleeps.

     -setsleep minutes
	     Sets amount of idle time until computer sleeps. Specify "Never" or "Off" for computers that should never sleep. Important: if you set
	     the system to sleep, you will not be able to administer the server remotely while it is sleeping.

     -getcomputersleep
	     Display amount of idle time until computer sleeps.

     -setcomputersleep minutes
	     Set amount of idle time until computer sleeps. Specify "Never" or "Off" for never.

     -getdisplaysleep
	     Display amount of idle time until display sleeps.

     -setdisplaysleep minutes
	     Set amount of idle time until display sleeps. Specify "Never" or "Off" for never.

     -getharddisksleep
	     Display amount of idle time until hard disk sleeps. Specify "Never" or "Off" for never.

     -setharddisksleep minutes
	     Set amount of idle time until hard disk sleeps. Specify "Never" or "Off" for never.

     -getwakeonmodem
	     Displays whether wake on modem is on or off.

     -setwakeonmodem on | off
	     Use this command to specify whether or not the server will wake from sleep when modem activity is detected.

     -getwakeonnetworkaccess
	     Displays whether wake on network access is on or off.

     -setwakeonnetworkaccess on | off
	     Use this command to specify whether the server wakes from sleep when a network admin packet is sent to it.

     -getrestartpowerfailure
	     Displays whether restart on power failure is on or off.

     -setrestartpowerfailure on | off
	     Use this command to specify whether the server automatically restarts after a power failure.

     -getrestartfreeze
	     Displays whether restart on freeze is on or off.

     -setrestartfreeze on | off
	     Use this command to specify whether the server restarts automatically after the system freezes.

     -getallowpowerbuttontosleepcomputer
	     Enable or disable whether the power button can sleep the computer.

     -setallowpowerbuttontosleepcomputer on | off
	     Enable or disable whether the power button can sleep the computer.

     -getremotelogin
	     Displays whether remote login (SSH) is on or off.

     -setremotelogin [-f] on | off
	     Sets remote login (SSH) to either on or off. Important  If you turn off remote login, you won't be able to administer the server
	     using remote command line tools and SSH. To turn remote login back on, you'll need to connect a monitor and keyboard to the server to
	     administer it locally. Use "setremotelogin -f off" to suppress prompting when turning remote login off.

     -getremoteappleevents
	     Displays whether remote apple events are on or off.

     -setremoteappleevents on | off
	     Use this command to set whether the server responds to events sent by other computers (such as AppleScripts).

     -getcomputername
	     Displays computer name.

     -setcomputername computername
	     Sets computer name to <computername>. This name is used by AFP.

     -getlocalsubnetname
	     Display local subnet name.

     -setlocalsubnetname name
	     Set local subnet name to <name>.

     -getstartupdisk
	     Displays current startup disk.

     -liststartupdisks
	     Lists all valid startup disks on this computer.

     -setstartupdisk path
	     Sets current startup disk to the indicated path. Valid arguments can be listed using "-liststartupdisks."

     -getwaitforstartupafterpowerfailure
	     Get the number of seconds after which the computer will start up after a power failure.

     -setwaitforstartupafterpowerfailure seconds
	     Set the number of seconds after which the computer will start up after a power failure. The <seconds> value must be a multiple of 30
	     seconds.

     -getdisablekeyboardwhenenclosurelockisengaged
	     Get whether or not the keyboard should be disabled when the X Serve enclosure lock is engaged.

     -setdisablekeyboardwhenenclosurelockisengaged yes | no
	     Set whether or not the keyboard should be disabled when the X Serve enclosure lock is engaged.

     -getkernelbootarchitecturesetting
	     Gets the Kernel Architecture setting from the com.apple.Boot.plist.

     -setkernelbootarchitecture i386 | x86_64 | default
	     Set the kernel to boot in 32 or 64 bit mode on next boot. default removes the setting.

     -version
	     Displays version of systemsetup tool.

     -help   Displays a list of all the commands available in the System Setup Tool, with explanatory information.

     -printCommands
	     Displays a list of commands with no detail.

EXAMPLES

     systemsetup -setdate 04:15:02

     systemsetup -settime 16:20:00

     systemsetup -settimezone US/Pacific

     systemsetup -setnetworktimeserver time.apple.com

FILES

     /usr/sbin/systemsetup

SEE ALSO

     networksetup(8)

Mac OS X							  April 15, 2002							  Mac OS X