subnet prefix length > 64 breaks IPv6?

sthaug at sthaug at
Sat Dec 24 07:08:22 UTC 2011

> I am not sure if this is the reason as this only applies to the link
> local IP address. One could still assign a global IPv6 address. So,
> why does basic IPv6 (ND process, etc) break if i use a netmask of say
> /120?

As long as you assign addresses statically, IPv6 works just fine with a
netmask > 64. We've been using this for several years now. No problem.

Steinar Haug, Nethelp consulting, sthaug at

More information about the NANOG mailing list