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AVM ISDN MultiProtocol Router for Windows 2000 ADSL Manual

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NT/MPRI – Glossary 122
SMTP (Simple Mail Transfer Protocol)
SMTP is a standard protocol for exchanging electronic mail (E-mail) be-
tween different computers. SMTP uses TCP port 25. It has a simple
structure and only supports the sending of e-mail over a data network.
The protocol is described in RFC 821.
SNMP = Simple Network Management Protocol
In the early 1980s the ISO produced a management model which was
documented in the OSI Management Framework (DIS 7498-4). This
model’s main objective is to allow seamless interoperation between
the network management products of different manufacturers. Within
the standard, aids are defined for obtaining information about the net-
work’s current state and for controlling individual components.
The ISO describes the management area as objects and attributes. The
sum of all manageable objects makes up the Management Information
Base (MIB). Communication between a Network Management Station
(NM Station) and the manageable objects is conducted via Agent Sta-
tions. SNMP controls data transmission between the Agent Station and
the NM Station over TCP/IP.
In addition to HTML management, the NT/MPRI also offer the option of
providing standard information over SNMP. SNMP access can be con-
trolled under the “Configuration / Security” menu.
Spoofing
In practice, certain applications exchange network packets constantly,
which in the case of WAN connections over ISDN would lead to connec-
tions being set up frequently. Certain types of packets especially in the
field of NetWare applications, such as watchdog packets for example,
require confirmation from the remote site and as a result cannot be
simply filtered out of the data stream and discarded by theNT/MPRI ,
since the application would then no longer be recognized by the serv-
er. Spoofing means that the NT/MPRI simulates the client's answer to
such packets locally.
The spoofing mechanisms used are negotiated during the connection
set-up with the remote site in accordance with the PSCP Draft. If the re-
mote site does not support spoofing, this function is disabled.
ntmpri-e.book Seite 122 Donnerstag, 28. Februar 2002 11:26 11
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