@misc{9221, author = {Karen Scarfone and Paul Hoffman}, title = {Guidelines on Firewalls and Firewall Policy}, year = {2009}, month = {2009-09-28}, publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901083}, language = {en}, }