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[root@host ~]# ifup dummy0
[root@host ~]# ifconfig dummy0
dummy0: flags=195<UP,BROADCAST,RUNNING,NOARP> mtu 1500
inet 192.168.50.102 netmask 255.255.255.0 broadcast 192.168.50.255
inet6 fe80::880d:32ff:fe89:bc45 prefixlen 64 scopeid 0x20<link>
ether 8a:0d:32:89:bc:45 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3 bytes 210 (210.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@host ~]# cat /etc/sysconfig/network-scripts/ifcfg-dummy0
DEVICE=dummy0
BOOTPROTO=none
ONBOOT=yes
NM_CONTROLLED=no
PROMISC=yes
IPADDR=192.168.50.102
NETMASK=255.255.255.0
[root@host ~]# sysctl -w net.ipv4.conf.dummy0.forwarding=1
net.ipv4.conf.dummy0.forwarding = 1
[root@host ~]# sysctl -w net.ipv4.conf.dummy0.forwarding=1
net.ipv4.conf.dummy0.forwarding = 1