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Why NETMASK of the alias interface is different then that of the physical interface if not specified while configuring ?

Solution Verified - Updated 2016-03-09T16:52:11+00:00 -

Issue

Physical interface is getting IP- 172.24.76.X from dhcp and the netmask is of /25 or 255.255.255.128
If an alias interface- like eth0:1 is configured on top of this physical interface of the same range as that of eth0 and NETMASK is not set then in ip a command output the NETMASK for this alias interface is seen as /16 or 255.255.0.0.

Environment

Red Hat Enterprise Linux (Any version)

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