IPv6 Addressing Help

David Freedman david.freedman at uk.clara.net
Fri Aug 14 11:45:29 CDT 2009


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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?

Actually, this is where I start to move from "conserve addressing
the good old way (tm)" to "Make it look readable"

$ sipcalc 2001:dbb::/64  --v6split=112 | grep \: | head -n9
- -[ipv6 : 2001:dbb::/64] - 0
Network                 - 2001:0dbb:0000:0000:0000:0000:0000:0000 -
                          2001:0dbb:0000:0000:0000:0000:0000:ffff
Network                 - 2001:0dbb:0000:0000:0000:0000:0001:0000 -
                          2001:0dbb:0000:0000:0000:0000:0001:ffff
Network                 - 2001:0dbb:0000:0000:0000:0000:0002:0000 -
                          2001:0dbb:0000:0000:0000:0000:0002:ffff
Network                 - 2001:0dbb:0000:0000:0000:0000:0003:0000 -
                          2001:0dbb:0000:0000:0000:0000:0003:ffff



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