Previous Page: The field must be in decimal dot notation, i.e. it must contain 4 numbers separated by. and each number cannot be greater than 255. e.g. 129.1.2.0 or255.255.255.0  Next Page: The specified context is invalid.

The mask is invalid. All the 1 bits in the mask must start at the left and be contiguous.

Source:  PPPRNCON

Explanation:  The IP subnet mask you entered is invalid. The decimal numbers you enter must represent binary ones from left to right. For example, 255 is a valid number because it represents binary 1111 1111. Decimal numbers that meet this requirement are 128, 192, 224, 240, 248, 252, 254, and 255. Decimal number 248 is valid because it represents 11111000.

Subnet mask 255.255.248.0 is valid because this decimal address defines a binary number in which all the onesare contiguous from left to right. Subnet mask 248.255.255.1 is invalid because zeros appear in the mask betweenthe ones in 248 and the ones in 255.

Action:  Enter a valid IP subnet mask.

  Previous Page: The field must be in decimal dot notation, i.e. it must contain 4 numbers separated by. and each number cannot be greater than 255. e.g. 129.1.2.0 or255.255.255.0  Next Page: The specified context is invalid.