BinTec X4000, Руководство пользователя

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X4000 User’s Guide 381
Typical Errors and Procedure
12
➤
Use S
YSTEM
➧
E
XTERNAL
S
YSTEM
L
OGGING
to check if X4000 is
configured so that syslog messages are sent to a host outside the LAN
(destination port 514).
➤
Use
IP
➧
S
TATIC
S
ETTINGS
to check if an IP address located outside the
LAN has been entered for X4000 under Time Server.
➤
Check the MIB table biboAdmTrapHostTable to determine if X4000 is
configured so that SNMP traps are sent to a host outside the LAN
(destination ports 161, 162).
➤
Check if the second B-channel is frequently set up and cleared for
connections with dynamic channel bundling due to fluctuating traffic.
➤
Use
debug all
or
trace
to check if a PC in the LAN is configured for the
WINS server with an incorrect IP address (destination ports 137-139). If
necessary, configure the PC properly or set the corresponding filters.
➤
Use
debug all
or
trace
to check if a PC in the LAN is configured for the
resolution of NetBIOS names with the help of DNS (it is accessed from a
client port to destination port 53). Do not try to resolve NetBIOS names with
DNS!
➤
Use
debug all
or
trace
to check if an application on a PC in the LAN is
trying to resolve names that the name server at the Internet provider does
not know (it is accessed from a client port to destination port 53). Install a
local HOSTS file in the Windows directory that can carry out name
resolution.
➤
Use
debug all
or
trace
to check if NetBIOS over IP is configured on a
PC in the LAN (it is accessed from source port 137 to destination port 53).
An attempt is thus made to resolve NetBIOS names over DNS. Disable
NetBIOS over IP or insert filters (configuration of the corresponding filters
can be found in
chapter 10.2.8, page 335 or use the simple NetBIOS filter
of the Configuration Wizard, see chapter 6, page 109 ).
➤
Check if you have configured Callback (see chapter 10.2.4, page 327 ) and
in doing so entered an incorrect number (Number under WAN P
ARTNER
➧
E
DIT
➧
WAN N
UMBERS
➧
E
DIT
).
➤
Check if you left a trace program running over an ISDN-PPP connection.
This would cause packets to be sent constantly over ISDN and the
connection would remain permanently open.