TMS zl Management and Configuration Guide ST.1.1.100226

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Glossary
transform set On the TMS zl Module, the transform set is called IPsec proposal. The term
transform set is used by the HP ProCurve Secure Router 7000dl series.
transport mode The IPsec mode in which a packet is encapsulated with an IPsec header before
the IP header is added. Therefore, both ends of the tunnel must be the ultimate
originators of the traffic.
Triple DES See 3DES.
tunnel A virtual path through another network. Some tunnels protect the packets
with encryption and/or authentication; other tunnels enable one type of PDU
to travel over a network that uses a different type of PDU.
tunnel mode The IPsec mode in which the VPN gateway secures traffic on behalf of endpoints
within the private network. Traffic is already encapsulated with an IP header
when it reaches the gateway. Then it is encapsulated with an IPsec header, as
well as a new delivery IP header that directs the packet to the remote tunnel
endpoint.
U
UDP User Datagram Protocol. Part of the Internet protocol suite, UDP enables
programs on networked computers to send short messages known as data-
grams to one another. Unlike TCP, UDP does not have the overhead of checking
if every packet actually arrived. UDP is, therefore, is faster and more efficient
for many lightweight or time-sensitive purposes. However, UDP does not
provide the reliability and ordering guarantees that TCP does. Datagrams may
arrive out of order or not arrive at all.
unicast A send method wherein the packet is sent by one device and is destined for
one other device only.
user group A collection of users to which firewall policies can be applied. The users can
be configured locally on the TMS zl Module or stored on a RADIUS directory.
V
virtual interface Because the TMS zl Module only has two physical ports, VLANs are virtual
interfaces instead of network interfaces. For ever virtual interface on the
module there must be a network interface on the host switch.