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To connect your machine to the CSE network, you
must first register your ethernet (AKA "MAC") address. And, to register
your MAC address, you need to find it on your machine. This document
explains how to do it for the following operating systems:
For others, or if you need assistance, contact support@cs.
Windows
Open a command window and enter the command
ipconfig /all. You will get a display like this:
C:\>ipconfig/all
...
Ethernet adapter El90x1:
Description . . . . . . . . : 3Com 3C90x Ethernet Adapter
Physical Address. . . . . . : 00-C0-4F-72-DC-2C
DHCP Enabled. . . . . . . . : No
IP Address. . . . . . . . . : 192.168.2.9
Subnet Mask . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . : 192.168.2.8
Primary WINS Server . . . . : 128.95.4.18
Secondary WINS Server . . . : 198.95.4.19
...
The MAC address for this adapter is 00-C0-4F-72-DC-2C.
Opening a Command Window
Sometimes the pointy-clicky interface just doesn't let you do what you
need to do. For those times, there is the command window.
- Click on the Start button.
- Select "Run." (screenshot)
- Enter the word "cmd" into the dialog box that appears. (screenshot)
- Click "Okay."
A window will appear in which you can type commands much like to a Unix
terminal window. If you are old enough to remember using MS-DOS, you will
find that many of the same commands are still supported. You may never
go back to point-n-click again!
Renewing Your DHCP Lease
DHCP is a service that is used to manage "leases" on IP (network)
addresses. The idea is that when a computer first connects to the
network, it requests an IP address from the DHCP service. That address
is returned and assigned to the network adaptor, but it's only good
for a fixed period of time-- typically a few hours. In the background,
a process on your computer renews the lease periodically-- well before
it expires. There is a mechanism for your computer to release a lease
on a network address before it expires, but the DHCP service doesn't
count on it-- your computer might crash or be carried out of range on
a wireless network. Therefore, the DHCP service will reassign your IP
address to another computer is the lease isn't renewed-- that allows
the DHCP service recycle IP addresses efficiently.
Sometimes, you need to explicitly release an IP address and request
a new one. That might be necessary, for example, if you move from one
wireless domain to another. Fortunately, it's easy to do, using the
same ipconfig command that's used to view your MAC address.
- To start, open a command window
- Enter the command ipconfig/release
- Enter the command ipconfig/renew
Each command should return in a few seconds. If not, it typically
takes about a minute for the computer to give up attempting to contact
a DHCP server that will grant it a lease. If you get an
"autoconfiguration" IP address, the renewal has failed. Contact
support if you need assistance.
Linux
At a command prompt, enter the command /sbin/ifconfig
eth0. The command will return a screen somewhat like this:
% /sbin/ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:A0:CC:23:39:3F
inet addr:142.103.175.109 Bcast:142.103.175.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:786404 errors:0 dropped:0 overruns:0 frame:0
TX packets:534006 errors:0 dropped:0 overruns:0 carrier:0
collisions:47 txqueuelen:100
Interrupt:17 Base address:0xf400
The MAC address of this adapter is 00:A0:CC:23:39:3F.
FreeBSD
At a command prompt, enter the command /sbin/ifconfig fxp0.
The command will return a screen somewhat like this:
% /sbin/ifconfig fxp0
fxp0: flags=8843 mtu 1500
inet 128.95.2.200 netmask 0xffffff00 broadcast 128.95.2.255
atalk 770.45 range 770-770 phase 2 broadcast 0.255
ether 00:a0:c9:49:98:5d
media: 100baseTX status: active
supported media: autoselect 100baseTX 100baseTX 10baseT/UTP 10baseT/UTP
The MAC address of this adapter is 00:a0:c9:49:98:5d.
Solaris
At a csh(1) command prompt, enter the command /usr/sbin/arp `hostname`.
You will see a screen like this:
% /usr/sbin/arp `hostname`
hammahamma (128.95.1.115) at 8:0:20:22:e2:be permanent published
The MAC address of this host is 08:00:20:22:e2:be.
MacOS
Open the "TCP/IP" control panel, then go to Edit-->User Mode
and select "Advanced." Click the "Info" button in the lower left corner of
the dialog box, that's where that information lies.
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