Under Ubuntu 1604, connect a box to a socket on the wall (of the lab), the box get both IPv4 and IPv6 addresses. IPv4 works fine, but IPv6 does not . I noticed that the global IPv6 address has a CIDR 128, something like:
I am wondering whether or not the IPv6 address with CIDR 128 valid? and why?
PS: My question is more about the size of 128, i.e., is it too big? Since I am expecting some number less than 128 such as 64. As an analogy, my IPv4 address is 192.168.10.117/24 or 127.0.0.1/8 where the CIDR is not 32 but less than 32. I even encountered once a problem with /32 IPv4 address which does not working, after changing it to /24 it worked then.