What IP protocol number is used in the protocol field of an IPv4 header, when IPv4 is used to tunnel IPv6 packets?
A. 6
B. 27
C. 41
D. 47
E. 51
What IP protocol number is used in the protocol field of an IPv4 header, when IPv4 is used to tunnel IPv6 packets?
A. 6
B. 27
C. 41
D. 47
E. 51