Issue

• IP addresses on a loopback alias are not added at boot. They must be brought up with the ifup command manually.

[root@test72 ~]# ip a
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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:a0:47:6a brd ff:ff:ff:ff:ff:ff
    inet 192.168.124.233/24 brd 192.168.124.255 scope global dynamic eth0
       valid_lft 3493sec preferred_lft 3493sec
    inet6 fe80::5054:ff:fea0:476a/64 scope link 
       valid_lft forever preferred_lft forever
[root@test72 ~]# ifup lo:0
[root@test72 ~]# ip a
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
    inet 127.12.12.12/32 brd 127.12.12.12 scope host lo:0
       valid_lft forever preferred_lft forever
    inet 127.12.12.13/32 brd 127.12.12.13 scope host lo:0
       valid_lft forever preferred_lft forever
    inet 148.122.176.0/32 brd 148.122.176.0 scope global lo:0
       valid_lft forever preferred_lft forever
    inet6 2001:4600:5::/128 scope global 
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:a0:47:6a brd ff:ff:ff:ff:ff:ff
    inet 192.168.124.233/24 brd 192.168.124.255 scope global dynamic eth0
       valid_lft 3482sec preferred_lft 3482sec
    inet6 fe80::5054:ff:fea0:476a/64 scope link 
       valid_lft forever preferred_lft forever