Indicate the mask to be logical-ANDed with the ip-address before being compared to the value in the ipRipFilterIpAddr field. If a subnet mask is not specified, it will be set automatically according to the following table: Class A: 255.0.0.0 Class B: 255.255.0.0 Class C: 255.255.255.0 If the value of the ipRipFilterIpAddr is 0.0.0.0 (a default route) then a mask value of 0.0.0.0 matches all IP-Addresses (normally used to disable all routes as last rule in the chain). An ipRipFilterIpAddr of 0.0.0.0 with a mask value of 255.255.255.255 matches (filters) the default route exactly. Host routes are created by setting the subnet mask to 255.255.255.255.