RHEL7 - Network information configuration

ifconfig command does not display newly added interface information if added using command line interface.

1. List currect interface configuration information
[root@sam ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:23:ae:b0:32:0c brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.120/24 brd 192.168.10.255 scope global enp0s25
       valid_lft forever preferred_lft forever
    inet 192.168.10.221/24 brd 192.168.10.255 scope global secondary enp0s25:0
       valid_lft forever preferred_lft forever
    inet 192.168.10.118/24 brd 192.168.10.255 scope global secondary enp0s25:1
       valid_lft forever preferred_lft forever
    inet 192.168.10.122/24 scope global secondary enp0s25
       valid_lft forever preferred_lft forever
    inet6 fe80::223:aeff:feb0:320c/64 scope link
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 52:54:00:a0:6d:79 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 500
    link/ether 52:54:00:a0:6d:79 brd ff:ff:ff:ff:ff:ff

2. Add new ip address to the interface
[root@sam ~]# ip addr add dev enp0s25:3 192.168.10.123/24
[root@sam ~]#


3. Open a new Putty window and should be able to get login prompt^C

4. List conrunt ip information
[root@sam ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:23:ae:b0:32:0c brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.120/24 brd 192.168.10.255 scope global enp0s25
       valid_lft forever preferred_lft forever
    inet 192.168.10.221/24 brd 192.168.10.255 scope global secondary enp0s25:0
       valid_lft forever preferred_lft forever
    inet 192.168.10.118/24 brd 192.168.10.255 scope global secondary enp0s25:1
       valid_lft forever preferred_lft forever
    inet 192.168.10.122/24 scope global secondary enp0s25
       valid_lft forever preferred_lft forever
    inet 192.168.10.123/24 scope global secondary enp0s25
       valid_lft forever preferred_lft forever
    inet6 fe80::223:aeff:feb0:320c/64 scope link
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 52:54:00:a0:6d:79 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 500
    link/ether 52:54:00:a0:6d:79 brd ff:ff:ff:ff:ff:ff
[root@sam ~]#

5. Display interface information using ifconfig command
[root@sam ~]# ifconfig -a
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.120  netmask 255.255.255.0  broadcast 192.168.10.255
        inet6 fe80::223:aeff:feb0:320c  prefixlen 64  scopeid 0x20<link>
        ether 00:23:ae:b0:32:0c  txqueuelen 1000  (Ethernet)
        RX packets 475862  bytes 32081767 (30.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 154846  bytes 59513891 (56.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 21  memory 0xf7ae0000-f7b00000

enp0s25:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.221  netmask 255.255.255.0  broadcast 192.168.10.255
        ether 00:23:ae:b0:32:0c  txqueuelen 1000  (Ethernet)
        device interrupt 21  memory 0xf7ae0000-f7b00000

enp0s25:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.118  netmask 255.255.255.0  broadcast 192.168.10.255
        ether 00:23:ae:b0:32:0c  txqueuelen 1000  (Ethernet)
        device interrupt 21  memory 0xf7ae0000-f7b00000

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 476  bytes 139565 (136.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 476  bytes 139565 (136.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:a0:6d:79  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0-nic: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 52:54:00:a0:6d:79  txqueuelen 500  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@sam ~]#