Ipconfig For Mac Os
Ipconfig (internet protocol configuration) in Microsoft Windows is a console application that displays all current TCP/IP network configuration values and can modify Dynamic Host Configuration Protocol DHCP and Domain Name System DNS settings. Mac OS X – Clearing or flushing the DNS Cache is regular occurrence for a network engineer. Once you go to a Web site, or do any DNS lookup, the IP gets cached for quite a while.
Check out the OS X Locations functionality: You can configure multiple network setups on your machine (default is Automatic) and then simply select one from the Apple Menu/Locations. I have: 1) Home (Wired Ethernet + Airport Ethernet) 2) Home DSL (Wired DSL Connection) 3) Work 1 (a static IP address) 4) Work 2 (a DHCP derived IP address) Works a treat. Get into work, plug in the ethernet cable, Apple Menu -> Locations -> Work, and hey presto, I'm on the work network.
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And vice versa the other way round C. Thanks for the input on configuring multiple network setups however this is for my home desktop that pretty much stays put in my room. The reason why i'm looking for a command line way to release & renew ip address is that my ISP leases out IPs on a weekly time scale. I usually don't turn off my machine and i just leave it on running all the time. It get's annoying when i return to my machine to find out the IP address has been revoked because it's run past it's leasing time and i have to run over to the Network System Preferences panel to renew my IP address. I almost always have an open terminal window and i'd REALLY like to be able to renew the IP information from their like you could on a wintel box typing in 'ipconfig /release' followed by 'ipconfig /renew'.
I KNOW someone out there knows how to do this. I believe ifconfig should do it. Remember that ifconfig is a tool to configure a network interface. 
Ipconfig For Mac Address
You will usually have the en0 interface, which is the first ethernet card in your system. You will always have the lo0 interface, which is the loopback adaptor. And you may have a ppp0 interface which would be your dial-up (modem) interface.
Ipconfig For Mac Os
In order to reconfigure the interface with a new ip address, you'll probably have to take it down ifconfig en0 down then give it a new ip address and bring it back up again ifconfig en0 123.123.123.123 up but definitely read up on the man pages there. I haven't played with this *too* much (I did once manage to manually configure my ethernet card on my linux box using ifconfig) Perhaps some of the hard-core unix networking gurus could provide some more detailed infos??