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Linux Administration 101.

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Section 17.

Network
configuration.

"The Network is the Computer."

John Gage - Sun Microsystems 1984.

17. Network configuration.

The command /sbin/ifconfig -a can be used to report on the network interface configuration and some basic statistics on the traffic through each interface.

17.1. Examples 

bash-4.2# ifconfig -a
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.4  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::207:e9ff:feb0:d042  prefixlen 64  scopeid 0x20<link>
        ether 00:07:e9:b0:d0:42  txqueuelen 1000  (Ethernet)
        RX packets 440521  bytes 231020833 (220.3 MiB)
        RX errors 0  dropped 377  overruns 0  frame 0
        TX packets 422575  bytes 139951096 (133.4 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 16436
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 216261  bytes 68171872 (65.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 216261  bytes 68171872 (65.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

With root privileges ifconfig can be used to set a number of parameters including the ip address, network mask, and broadcast address. The interface can also be activated and deactivated.

17.2. Examples. 

bash-4.2# ifconfig|grep eth
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 00:07:e9:b0:d0:42  txqueuelen 1000  (Ethernet)

bash-4.2# ifconfig eth1
eth1: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        inet 10.0.0.14  netmask 255.255.255.0  broadcast 10.0.0.255
        ether 00:07:e9:b0:d0:42  txqueuelen 1000  (Ethernet)
        RX packets 444377  bytes 233019619 (222.2 MiB)
        RX errors 0  dropped 377  overruns 0  frame 0
        TX packets 426914  bytes 140687564 (134.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

sa101$ ifconfig eth1 10.0.0.4 netmask 255.255.255.0 broadcast 10.0.0.255 up
sa101$ ifconfig
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.4  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::207:e9ff:feb0:d042  prefixlen 64  scopeid 0x20<link>
        ether 00:07:e9:b0:d0:42  txqueuelen 1000  (Ethernet)
        RX packets 444442  bytes 233024071 (222.2 MiB)
        RX errors 0  dropped 377  overruns 0  frame 0
        TX packets 426964  bytes 140696016 (134.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 16436
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 221358  bytes 70381542 (67.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 221358  bytes 70381542 (67.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

sa101$ ifconfig eth1 down
sa101$ ifconfig

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 16436
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 221376  bytes 70383294 (67.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 221376  bytes 70383294 (67.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
sa101$ ifconfig eth1 up

sa101$ ifconfig eth1
eth1: flags=4098<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 10.0.0.4  netmask 255.255.255.0  broadcast 10.0.0.255
        ether 00:07:e9:b0:d0:42  txqueuelen 1000  (Ethernet)
        RX packets 444451  bytes 233024695 (222.2 MiB)
        RX errors 0  dropped 377  overruns 0  frame 0
        TX packets 426970  bytes 140697228 (134.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Trainer

Picture of Clifford W Fulford - IT consultant
Clifford W Fulford BA(Hons), PGDip (Computing), PGCE. DES/DFE No. 7773034.

I started my career in computing in the days of CPM and C/CPM, building network operating systems and correcting bespoke software written to manage community transport booking and accounting systems.

I fist came across UNIX when called upon to migrate database systems from Mercator BBS to Thoroughbred Basic. Excited by the power and flexibility of UNIX in 1989/90 I studied the OS at City University night classes while developing my practical skills in a SCO Xenix environment during the working day.

In 1994 I was introduced to Linux by students in the School of Mathematics and Computing at North London University. Although initially sceptical of the ability of the fledgling OS to meet the requirements of large scale mission critical systems, I rapidly became a convert to Linux in a corporate environment.

I have now worked professionally as a systems manager and systems administrator with Xenix, AIX, HPUX, SunOS, Solaris and Linux in the City, Antwerp, McLean Virginia, Cairo, Birmingham and Nottingham for over 25 years

Copyright © 2003-2017 Clifford W Fulford.
Fulford Consulting Ltd. Regd. Co. 4250037 in England & Wales. Regd. office 162, Edward Rd. Nottingham NG2 5GF, England, UK.

Related web sites: City Linux | Flare Support | West Bridgford | Fulford Portal | Joan Mary Fulford (Nottingham Writer) | Fulford Gallery | Amharic Interpreter | Arabic Interpreter | Tigrinya Interpreter

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