Hello i would like to ask a question i was reading somewhere about this tunnel we can use in debian by adding /etc/network/interface which looks like this

if some one has any idea please let me know the name of the tunnel

auto tun0
iface tun0 inet6 v4tunnel

endpoint XX.XX.XX.XX ( Ipv4 address )

address YYYY:YYYY:YYYY::1 (IPv6 address given to the machine)

gateway YYYY:YYYY:YYYY::2 (IPv6 address given to the accessing machine)

netmask 64


The tunnel looks something like that i was testing it and it was working but i have no idea about what kind of tunnel it is

Is it 6to4 , 6in4, 6from4 or any other form of tunnel

can someone please explain me a bit about which type of tunnel is it . i would be really thankful