This error comes when you try to setup 2 IP address for single (1) network card. All you need to do is use diffrent netmask to avoid this error. For example if your NIC card netmaks is 255.255.255.0 then use 255.255.255.255 as netmask for alias
Real lnc0 - IP : 192.168.1.2/255.255.255.0
lnc0 alias - IP : 192.168.1.115/255.255.255.255
And then type command
Code:
ifconfig lnc0 192.168.1.115 netmask 255.255.255.255 alias
Verify it with ifconfig command or ping command
Code:
ifconfig -a
ping 192.168.1.115
ping 192.168.1.2
sure replace lnc0 with your actual network interface card
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