Represents the IP mask used on the Ethernet network. The IP Mask is used for subnet addressing. A write to this attribute is ignored when the DHCP Enabled attribute is True. A read of this attribute returns either the user specified value or the value determined from DHCP. The following IP masks are invalid and cannot be written successfully: 0.0.0.0 and 255.255.255.255. Generally, an IP mask consists of between 1 and 31 consecutive 1 bits, followed by 31 to 1 consecutive 0 bits when written out in binary notation. We recommend the IP mask follow this pattern.
The IP Mask attribute may be set explicitly, or it may be automatically set using the DHCP server. Using a DHCP server may change this attribute even if you have set it up explicitly. See the DHCP Enabled attribute.
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