Suresh Krishnan, David Thaler, James A. Hoagland. Security Concerns with IP Tunneling. RFC, 6169:1-20, April 2011. [doi]
@article{rfc6169, title = {Security Concerns with IP Tunneling}, author = {Suresh Krishnan and David Thaler and James A. Hoagland}, year = {2011}, month = {April}, doi = {10.17487/RFC6169}, url = {https://doi.org/10.17487/RFC6169}, researchr = {https://researchr.org/publication/rfc6169}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {6169}, pages = {1-20}, }