Check IPv6 support on Linux
FACT #1 – Number of IP addresses available theoretically.
IPv4 – 4,294,967,296
IPv6 – 340,282,366,920,938,463,463,374,607,431,768,211,456
CHECK #1 – Checking IPv6 support on your LINUX machine.
this command must shows two up interfaces with IPv6 addresses.
lsmod | grep -w 'ipv6'
this will show if IPv6 kernel module is loaded.
CHECK #2 – Ping localhost on IPv6 interface.
ping6 -c4 ::1