Kerio Tech Firewall6 - Manual (Page 398)

Glossary of terms
398
• RST (Reset) — request on termination of a current connection and on initiation
of a new one
• URG (Urgent) — urgent packet
• PSH (Push) — request on immediate transmission of the data to upper TCP/IP
layers
• FIN (Finalize) — connection finalization
TCP/IP
Name used for all traffic protocols used in the Internet (i.e. for IP, ICMP, TCP, UDP, etc.).
TCP/IP does not stand for any particular protocol!
TLS
Transport Layer Security. New version of SSL protocol. This version is approved by the
IETF and it is accepted by all the top IT companies (i.e. Microsoft Corporation).
UDP
User Datagram Protocol is a transmission protocol which transfers data through individ-
ual messages (so called datagrams). It does not establish new connections nor it provides
reliable and sequentional data delivery, nor it enables error correction or data stream
control. It is used for transfer of small-sized data (i.e. DNS queries) or for transmissions
where speed is preferred from reliability (i.e. realtime audio and video files transmission).
VPN
Virtual Private Network, VPN represents secure interconnection of private networks (i.e.
of individual offices of an organization) via the Internet. Traffic between both networks
(so called tunnel) is encrypted. This protects networks from tapping. VPN incorporates
special tunneling protocols, such as Microsoft’s IPSec and PPTP (Point-to-Point Tunnelling
Protocol).
WinRoute contains a proprietary VPN implementation called Kerio VPN.