4/13/2023 0 Comments Circuit level proxy firewallWith a static packetfilter, you had to define rules to allow the return packets back into yoursystem. A dynamic packet filter can open the requiredports to allow a communication session to be established. It looks at not only source anddestination IP addresses and ports, but also uses the TCP flags and sequencenumbers to aid in this decision. It works at the network layer of the OSI modellike a static packet filter, but examines the packet headers to determine if apacket is part of an existing session. So, at the lower end of the spectrum, we have a product that works a littlelike a dynamic packet filter. Or it could be what is termed acircuit-level proxy, creating a pathway between client and server. Sometimes astateful inspection firewall is simply a static packet filter with someintelligence built in, examining the contents of a packet and deciding if it isin response to a request already allowed. The term "stateful" covers a wide range of methods. Personal Firewalls for Administrators and Remote Users
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |