TY - GEN AU - K A Scarfone AU - P Hoffman C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2009-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.800-41r1 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2009 TI - Guidelines on firewalls and firewall policy: ER -