1

We currently run Suse servers and add the following to the loopback interface:

vi /etc/sysconfig/network/ifcfg-lo

# Loopback (lo) configuration
IPADDR=127.0.0.1/8
IPADDR_2=192.168.0.91/32
NETMASK=255.0.0.0
NETWORK=127.0.0.0
STARTMODE=nfsroot
BOOTPROTO=static
USERCONTROL=no
FIREWALL=no

We are migrating to Centos 7 and this does not work. I have tried

vi /etc/sysconfig/network-scripts/ifcfg-lo:10

DEVICE=lo:10
BOOTPROTO=static
BROADCAST=192.168.0.255
HWADDR=00:0C:29:1E:DE:86
IPADDR=192.168.0.91
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes

Restarted the network, it picks up the interface with ip addr, but still packets are not properly redirected.

How do i add the second ip (192.168.0.91) to the loopback of Centos 7

2

I was trying to route it back onto the 192.168.0.0 network instead of locally. I edited the interface as follows (note the network address of 127.0.0.0 instead of 192.168.0.0)

vi /etc/sysconfig/network-scripts/ifcfg-lo:10

DEVICE=lo:10
IPADDR=192.168.0.91
NETMASK=255.255.255.255
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback
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