防火墙名词解释（Firewall terminology explanation）.doc

防火墙名词解释（Firewall terminology explanation） Enterprise firewall series What is PPTP? [2006-7-27 15:24:12] : point to point tunneling protocol PPTP (Point-to-Point Tunneling Protocol) is a protocol defined by the PPTP forum, which allows the PPP package package package in IP, which in any IP network including Internet forwarding. Both Windows98 and above support PPTP. What is the difference between transport mode and tunneling mode? [2006-7-27 15:22:52] Transport mode the packet (data) portion of the packet is encapsulated by encryption, but the IP head remains transparent (not changed). It is mainly used in a IP host to protect locally initiated data. The transport mode protects only the upper protocol of the IP payload (user data). DWnet VPN firewall does not support transmission mode. Tunneling mode - all parts, including the original IP head, are encapsulated to produce a new IP header. Only this new head is transparent (unprotected) this way its safer. Security oriented gateway, which enables security gateways to provide IPSec services to other machines that lack IPSec capabilities, and tunnel mode can protect the entire IP package, including user data. DWnet VPN Firewall support tunnel mode. What security protocols does IPSec support? [2006-7-27 15:21:25] IPSec provides 2 protocols: AH (certification in Baotou, to provide the data source authentication, data integrity protection, replay protection function, protocol No. 51) and ESP (encapsulating security payload, providing data confidentiality, data source authentication, data integrity, replay protection function, protocol No. 50) What is IPsec? [2006-7-27 15:20:48] IPSec is a broad VPN security standard that is used on TCP/IP networks. It works at the packet level to validate and encrypt all packets in the VPN channel. So, it doesnt care what applications you use on your PC, and any application can use VPN like any other network connection. IPSec VPN exchange information through a connection called SA (secure