This scalar globally enables/disables discarding of the IP well-known addresses described below: | Address block | Present use | |0.0.0.0/8 | Addresses in this block refer to source hosts |(except 0.0.0.0/32 | on 'this' network. | as source address) | | |127.0.0.0/8 | This block is assigned for use as the Internet host loop-back address. | |192.0.2.0/24 | This block is assigned as 'TEST-NET' | | for use in documentation and example code. | |224.0.0.0/4 as source. | This block, formerly known as the Class D address space, | | is allocated for use in IPv4 multicast address assignments. | |240.0.0.0/4 | |(except 255.255.255.255/32 | This block, formerly known as the Class E address space, is reserved. | as destination address) | |