CentOS-6.10
We have a host with the following ifcfg file contents:
BOOTPROTO=none BROADCAST="" DEFROUTE=yes DEVICE=eth1 . . . GATEWAY=X.Y.Z.234 IPADDR=A.B.C.2 IPV4_FAILURE_FATAL=yes NAME="LAN Link - eth1" NETMASK="255.255.255.128" NETWORK="A.B.C.0" NM_CONTROLLED=no ONBOOT=yes PREFIX=25 TYPE=Ethernet USERCTL=no
And an aliased ifcfg containing this:
BOOTPROTO="none" BROADCAST="192.168.8.255" DEVICE="eth1:192008001" IPADDR="192.168.8.1" IPV6INIT="no" NETMASK="255.255.255.0" NETWORK="192.168.8.0" ONPARENT="yes"
However, ifconfig shows this:
# ifconfig eth1:192008001 eth1:192008001 Link encap:Ethernet HWaddr 00:25:90:61:74:C1 inet addr:192.168.8.1 Bcast:192.168.8.255 Mask:255.255.255.128 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:17 Memory:feae0000-feb00000
Which shows that the network mask is determined by the interface mask and is not overridden by the alias definition.
Is this expected behaviour? Does this mean that a particular physical interface cannot belong to more than one network, or at least not to networks having differing cidr masks?