Glossary
TAINY iQ
Page 133 of 147
DPD
The Dead Peer Detection (DPD) identifies whether the IPsec connection
between two networks is still valid or if the connection has to be re-
established. This function presumes though that it is supported on both
sides. Without DPD depending on the configuration the connection has to be
manually re-established or the lifetime of the SA has to elapse. To control if
the IPsec connection is still valid the DPD sends a DPD-request to the
opposite party. If no answer is received the IPsec connection will be
interrupted after a number of failed attempts.
DynDNS provider
Also
Dynamic DNS provider
. Every computer that is connected to the
internet has an IP address (IP = Internet Protocol). An IP address consists of
up to 4 four three-digit numbers, with dots separating each of the numbers. If
the computer is online via the telephone line via modem, ISDN or ADSL,
then the internet service provider dynamically assigns it an IP address, i.e.
the address changes from session to session. Even if the computer is online
for more than 24 hours without interruption (e.g. in the case of a flat rate),
the IP address is changed periodically.
For a local computer to be accessible via the internet, its address must be
known to the external remote station. This is necessary for it to establish a
connection to the local computer. This is not possible, however, if the
address of the local computer constantly changes. It is possible, however, if
the user of the local computer has an account with a DynamicDNS provider
(DNS = Domain Name Server).
Then he can specify a host name, under which the computer can be
accessed in the future, e.g.: www.xyz.abc.de. Moreover, the DynamicDNS
provider makes a small program available that has to be installed and
executed on the computer concerned. In each internet session of the local
computer this tool reports to the DynamicDNS provider which IP address the
computer obtains at the moment. Its domain name server registers the
current host name - IP address assignment and reports it to other domain
name servers on the internet.
If now an external computer tries to establish a connection with a local
computer which is registered with the DynamicDNS provider, the external
computer uses the host name of the local computer as the address. This
way a connection is established with the responsible DNS (Domain Name
Server) to look up the IP address which is currently assigned to this host
name. The IP address is transmitted back to the external computer, and
then used by it as the destination address. It now leads precisely to the
desired local computer.
As a rule, all internet addresses are based on the following method: First a
connection is established to a DNS to determine the IP addresses assigned
to this host name. Once that has been accomplished, the IP address that
was sought after is used to establish the connection to the desired remote
station, which could be any Web site.
EDGE
EDGE (= Enhanced Data Rates for GSM Evolution) refers to a method by
which the available data rates in GSM mobile phone networks are increased
by introducing an additional modulation process. EDGE, GPRS is expanded
to become EGPRS (Enhanced GPRS), and HSCSD is expanded to become
ECSD.
EGPRS
EGPRS stands for "Enhanced General Packet Radio Service", describes a
packet-oriented data service based on GPRS, which is accelerated by
EDGE technology.
Summary of Contents for TAINY IQ-LTE
Page 1: ...TAINY IQ LTE User Manual ...
