RHEL7 - Assigning ip, gateway and dns on RHEL7 server

1. List all available interface on the system

[root@ashok ~]# nmcli connection show
- only to show active ones
[root@ashok ~]# nmcli connection show -active
NAME                UUID                                  TYPE            DEVICE
virbr0-nic          e9279275-54b8-48ef-a756-d4d714bcd5ac  generic         virbr0-nic
virbr0              b7af90bc-8003-49df-bf58-4180828be0fd  bridge          virbr0
Wired connection 2  e3d708dc-aefd-41ea-96d2-81bdd0d307b7  802-3-ethernet  ens37
Wired connection 1  8b3b2e8a-1e5d-4982-93d0-77f7fe4eba6a  802-3-ethernet  ens38
default             4f8fe83d-df38-4441-83ae-0d400f76c43d  802-3-ethernet  ens33

- list all configuration setting for the interace
[root@ashok ~]# nmcli con show "Wired connection 1"
connection.id:                          Wired connection 1
connection.uuid:                        8b3b2e8a-1e5d-4982-93d0-77f7fe4eba6a
connection.interface-name:              --
connection.type:                        802-3-ethernet
connection.autoconnect:                 yes

- [root@ashok ~]# nmcli dev status
DEVICE      TYPE      STATE      CONNECTION
virbr0      bridge    connected  virbr0
ens33       ethernet  connected  default
ens37       ethernet  connected  Wired connection 2
ens38       ethernet  connected  Wired connection 1
virbr0-nic  tap       connected  virbr0-nic
lo          loopback  unmanaged  --

- display device status
[root@ashok ~]# nmcli dev show ens38
GENERAL.DEVICE:                         ens38
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         00:0C:29:80:C1:E6
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.10.17/24
IP4.GATEWAY:                            192.168.10.1
IP4.DNS[1]:                             192.168.10.1
IP6.ADDRESS[1]:                         fe80::20c:29ff:fe80:c1e6/64
IP6.GATEWAY:
[root@ashok ~]#



2. Assign static ip/gateway/dns on one of the interface
- adding ip/gateway
[root@ashok ~]# nmcli con add con-name eth-ens38 ifname ens38 type ethernet ip4 192.168.10.220/24 gw4 192.168.10.1
Connection 'eth-ens38' (23d86e57-2fae-480f-8015-4ea7a8539812) successfully added.
[root@ashok ~]#

- adding nameserver
[root@ashok ~]# nmcli con mod "eth-ens38" ipv4.dns 192.168.10.110


3. Bring up the interface.

- list connections on the system
[root@ashok ~]# nmcli connection show
NAME                UUID                                  TYPE            DEVICE
eth-ens38           23d86e57-2fae-480f-8015-4ea7a8539812  802-3-ethernet  --
Wired connection 1  8b3b2e8a-1e5d-4982-93d0-77f7fe4eba6a  802-3-ethernet  ens38
15dd-442e-bc69-25c5bf2c1b6b  802-3-ethernet  --

- bring up the interface
[root@ashok ~]# nmcli con up eth-ens38

- list the active interface
[root@ashok ~]# nmcli con show --active
NAME                UUID                                  TYPE            DEVICE
eth-ens38           23d86e57-2fae-480f-8015-4ea7a8539812  802-3-ethernet  ens38

- verify the ip address

[root@ashok ~]# ip addr show ens38
4: ens38: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:80:c1:e6 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.220/24 brd 192.168.10.255 scope global ens38
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe80:c1e6/64 scope link
       valid_lft forever preferred_lft forever
[root@ashok ~]#


4. Reboot the system and verify that your assigned ip address is still available.

- upon rebooting the system, verify the ip address is available.

# ifconfig -a
# ip addr show

[root@ashok ~]# ip route
default via 192.168.10.1 dev ens33  proto static  metric 100
192.168.10.0/24 dev ens38  proto kernel  scope link  src 192.168.10.220  metric 102
[root@ashok ~]#

[root@ashok ~]# ping -c 2 yahoo.com
PING yahoo.com (98.138.253.109) 56(84) bytes of data.
64 bytes from ir1.fp.vip.ne1.yahoo.com (98.138.253.109): icmp_seq=1 ttl=52 time=53.9 ms