Randy Bush wrote:
In practice, many routers require the packet to go twice in the hardware if
the prefix length is > 64 bits, so even though it is a total waste of space,
it is not stupid to use /64 for point-to-point links and even for loopbacks!
some of us remember when we thought similarly for /24s for p2p links,
especially when using rip.
and consider matsuzaki-san's dos vulnerability on a /64 p2p link. the
prudent operational advice today is to use a /127.
I thought there was an issue with duplicate address detection with /127
(RFC3627)? /126 should work and lots of folks use /112 which is a more
human-friendly bit boundary. /112 is also good for multiple access
vlans and just about anything that isn't using autoconfig.
- Kevin
