%% You should probably cite rfc8159 instead of this I-D. @techreport{ietf-l2tpext-keyed-ipv6-tunnel-03, number = {draft-ietf-l2tpext-keyed-ipv6-tunnel-03}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-l2tpext-keyed-ipv6-tunnel/03/}, author = {Maciek Konstantynowicz and Giles Heron and Rainer Schatzmayr and Wim Henderickx}, title = {{Keyed IPv6 Tunnel}}, pagetotal = 11, year = 2015, month = mar, day = 5, abstract = {This document describes a simple L2 Ethernet over IPv6 tunnel encapsulation with mandatory 64-bit cookie for connecting L2 Ethernet attachment circuits identified by IPv6 addresses. The encapsulation is based on L2TPv3 over IP.}, }