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Filters and Spoofing
NetWAYS/ISDN – 3 Remote Access with NetWAYS/ISDN 25
NetWAYS/ISDN provides the following filters for the IPX and
IP protocols:
SNMP
SNMP (Simple Network Management Protocol) is a com-
mon protocol used to transport network management
information. SNMP packets are used for centralized
monitoring of network resources. These packets trans-
port status and alarm messages from network compo-
nents such as workstations, servers and routers. SNMP
can be transported by IP and IPX packets. When this fil-
ter is activated, SNMP packets over IP or IPX are filtered
out and not transported over ISDN.
NetBIOS
NetBIOS is a command set used by certain applications
for network communication. NetBIOS can be transport-
ed both over IPX and over IP, and is the protocol used by
Windows file and printer sharing. To prevent these
packets from being transmitted over ISDN, activate the
NetBIOS over IPX or the NetBIOS over IP filter.
If there are Windows XP, Me, 2000, 98 or NT computers act-
ing as servers in the LAN, then you must allow NetBIOS
packets to be transported over ISDN in order for these serv-
ers to be accessible. Although communication in Microsoft
networks is independent of the transport protocol, it de-
pends on NetBIOS.
Spoofing
Some types of packets exchanged between clients and serv-
ers must be acknowledged by the remote system, and
cannot be simply filtered out of the data stream. Otherwise,
communication between the server and the remote client
would no longer function correctly. Spoofing mechanisms
can be used by the NetWAYS/ISDN computer and the remote
access server to intercept such packets and acknowledge
them locally, simulating a reply from the system at the other
end of the ISDN line. In this way such overhead packets can
be kept out of the ISDN traffic without interrupting an exist-
ing logical connection.
netways-e.book Seite 25 Freitag, 28. November 2003 3:51 15
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