ifconfig -a Command, need help on output.....

redhat70 · 10-10-2012, 02:26 PM

Hi,

# ifconfig -a

Output :
=======

eth0 Link encap:Ethernet HWaddr E4:1F:13:30:27:04
inet addr:192.168.150.4 Bcast:192.168.150.255 Mask:255.255.255.0
inet6 addr: fe80::e61f:13ff:fe30:2704/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14056743 errors:0 dropped:0 overruns:0 frame:0
TX packets:6088914 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2148615215 (2.0 GiB) TX bytes:603297116 (575.3 MiB)
Interrupt:169 Memory:92000000-92012100

eth1 Link encap:Ethernet HWaddr E4:1F:13:30:27:06
inet addr:192.168.152.2 Bcast:192.168.152.127 Mask:255.255.255.128
inet6 addr: fe80::e61f:13ff:fe30:2706/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8994137 errors:0 dropped:0 overruns:0 frame:0
TX packets:8714781 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:584049190 (556.9 MiB) TX bytes:677753107 (646.3 MiB)
Interrupt:202 Memory:94000000-94012100

eth1:2 Link encap:Ethernet HWaddr E4:1F:13:30:27:06
inet addr:192.168.152.82 Bcast:192.168.152.127 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:202 Memory:94000000-94012100

My question is :
==================

Q.1) what is the difference between eth1 and eth1:2 ?

Q.2) Is their any other command which can display the interfaces etho,eth1,eth2 etc....in Single along with their IPs instead of the above full output ?

I mean instead of :

Link encap:Ethernet HWaddr E4:1F:13:30:27:06
inet addr:192.168.152.82 Bcast:192.168.152.127 Mask:255.255.255.128
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:202 Memory:94000000-94012100

I want the output as :

etho : 192.168.150.4

eth 1 : 192.168.152.2

eth1:2 : 192.168.152.82

Regards,
Aparna.

kamran.ayub · 10-11-2012, 02:23 AM

For such bried needful information you may search your desired strings as following :

ifconfig -a | grep 'eth\|inet'

eth0 Link encap:Ethernet HWaddr 00:50:56:B6:35:98
inet addr:192.168.200.147 Bcast:192.168.200.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:feb6:3563/64 Scope:Link

so its just a handy info for you as required.

henrycoffin · 10-11-2012, 03:11 AM

eth1:2 is a secondary IP on the same NIC

routers · 10-11-2012, 03:59 AM

use this command

Code:

/sbin/ifconfig | cut -d " " -f1,12,16 | grep -A 1 eth | tr -d - | tr -s "\n" |sed -e :a -e N -e 's/\n/ /'

copy and paste

cheers

chrism01 · 10-11-2012, 06:24 AM

Re 1:
A single physical interface (NIC) eg eth0 can have multiple virtual interfaces assigned to it (aka 'vif's)

A single usually looks like eth0, eth1 etc.
vif's append':x' where x is another num hence eth1:2