Use `is_unicast` instead of ``!is_multicast`
Use `is_unicast` instead of ``!is_multicast`

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust