Section H-2. ipconfig and ifconfig


H-2. ipconfig and ifconfig

On Unix, you can obtain the machine's network configuration using ifconfig. The command on Windows is ipconfig. To summarize the command:

  • Use this tool to obtain the IP address, subnet mask, and default gateway.

  • On Windows, use ipconfig /? for help.

  • On Unix, use man ifconfig for help.

  • Note that on Linux systems, you may not have permission to run ifconfig. It also may be in a location that isn't in your pathe.g., /sbin/ifconfig.

Here's a run of ifconfig on a Unix system:

 $ /sbin/ifconfig -a eth0      Link encap:Ethernet  HWaddr 00:11:43:17:06:8D          inet addr: 192.168.0.48  Bcast:192.168.0.255  Mask:255.255.255.0          inet6 addr: fe80::211:43ff:fe17:68d/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:282499 errors:0 dropped:0 overruns:0 frame:15          TX packets:33484 errors:0 dropped:0 overruns:0 carrier:0          collisions:550 txqueuelen:1000          RX bytes:43199045 (41.1 MiB)  TX bytes:6730704 (6.4 MiB)          Interrupt:169   lo        Link encap:Local Loopback          inet addr:127.0.0.1  Mask:255.0.0.0          inet6 addr: ::1/128 Scope:Host          UP LOOPBACK RUNNING  MTU:16436  Metric:1          RX packets:304 errors:0 dropped:0 overruns:0 frame:0          TX packets:304 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0          RX bytes:26811 (26.1 KiB)  TX bytes:26811 (26.1 KiB)   sit0      Link encap:IPv6-in-IPv4          NOARP  MTU:1480  Metric:1          RX packets:0 errors:0 dropped:0 overruns:0 frame:0          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b) 

Note that along with the IP address and other related information, we see the MAC address, labeled as ether.

Windows output looks like the following:

 C:\>ipconfig   Windows IP Configuration     Ethernet adapter Local Area Connection:           Media State . . . . . . . . . . . : Media disconnected   Ethernet adapter Wireless Network Connection 2:           Connection-specific DNS Suffix  . : hsd1.ga.comcast.net.         IP Address. . . . . . . . . . . . : 192.168.1.120         Subnet Mask . . . . . . . . . . . : 255.255.255.0         Default Gateway . . . . . . . . . : 192.168.1.3 




Essential SNMP
Essential SNMP, Second Edition
ISBN: 0596008406
EAN: 2147483647
Year: 2003
Pages: 165

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