@misc{1195556,
  author = {K A Scarfone and P Hoffman},
  title = {Guidelines on firewalls and firewall policy:},
  year = {2009},
  month = {2009-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.800-41r1},
  language = {en},
}