Jon Lewis wrote:
On Fri, 14 Aug 2009, David Freedman wrote:
Will keep it simple, this is what I (and I suspect many others) do
/128 - Loopback (what else?)
/126 - Router p2p
/112 - Router LAN shared segments (p2mp)
Why even go that big on LAN segments? i.e. If you have a LAN/VLAN where
you have say 20 devices (routers, switches, etc.) and know you'll never
have more than say 50-100 devices, why not go as far as using a /120?
As long as it makes the nibble, I don't think it really matters much. I
wouldn't assign anything to a router p2p unless it's on the nibble, just
for administrative ease. That being said, presentation in routers is
much cleaner using /64's, with perhaps 1 /64 broken into loopbacks,
which will still stay relatively short in display. It may be wasteful,
but minimal in waste compared to the /48's we hand out to customers.
My first /48 was assigned for internal use, and as an ISP, I doubt I'll
ever use it all even with an extreme amount of waste.
My favorite shortcut was 2607:f780::1 which is assigned to the
reachability server, as easy as I could make it for customers to ping by
number when troubleshooting with the helpdesk.
-Jack
