Networking
ip – Recommended IPv6 prefix size for PPP to a single host?

Abstract
On inter-router point-to-point links, it is useful, for security and
other reasons, to use 127-bit IPv6 prefixes. Such a practice parallels
the use of 31-bit prefixes in IPv4. This document specifies the
motivation for, and usages of, 127-bit IPv6 prefix lengths on
inter-router point-to-point links.
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