ipv6 p2p link

krutibasa majhi · ‎10-31-2014

Dear all, what is the best practice and how can i use ipv6 address in point to point wan link like ipv4 /30 .please share any link or example .

2001:2206:72fe::/48

thanks

Seb Rupik · ‎10-31-2014

Hi there,

IPv6 point to point links should always be /127, equivalent to IPv4 /31 .

Your two addresses will still use an entire /64, but will be masked as a /127 :

2001:2206:72fe::/64

2001:2206:72fe::/127

2001:2206:72fe::1/127

2001:2206:72fe:0001::/64

2001:2206:72fe:0001::/127

2001:2206:72fe:0001::1/127

..etc

cheers,

Seb.

Tim Martin · ‎11-06-2014

There has been some guidance that says to reserve a /64 and configure the /127. That works well if you have “gobs” of space, like a /40 to work from.

The other school of thought is to configure all of your p2p links (/127) out of a single /64. Works for deployments that have a more limited amount of space, like a /48. Yes, that seems odd to say "limited"..

/128 with the same guidance. Do not use all 0’s or all 1’s in the host id

When allocating /127’s Make sure to start with xx:2 & xx:3