5-7
Basic Configuration
•
NTP Timeout:
The amount of time in seconds, that will elapse between each attempt to
contact the NTP server. When the initial attempt is unsuccessful, the RPS will retry the
connection four times. If neither the primary nor secondary NTP server responds, the RPS
will wait 24 hours before attempting to contact the NTP server again.
(Default = 3 Seconds.)
•
Test NTP Servers:
(Text Interface Only) Allows you to ping the IP addresses or domain
names defined via the Primary and Secondary NTP Address prompts, or to ping a new
address or domain defined via the Test NTP Servers submenu in order to check that a valid
IP address or domain name has been entered.
Note:
In order for the Test NTP Servers feature to function, your network and/or
firewall must be configured to allow ping commands.
5.3.2. The Invalid Access Lockout Feature
When properly configured and enabled, the Invalid Access Lockout feature can watch all login
attempts made via Telnet connection, web browser or the serial SetUp Port. If the counter for any
of these exceeds the user-defined threshold for maximum invalid attempts, then the corresponding
port or protocol will be automatically disabled for the length of time specified by the Lockout
Duration parameter.
When Invalid Access Attempt monitoring is enabled for the serial SetUp Port, the RPS will
count invalid access attempts at the serial SetUp Port. If the number of invalid access attempts
exceeds the defined Lockout Attempts trigger value, the RPS will lock the serial SetUp Port for
the defined Lockout Duration period. When Invalid Access Attempt monitoring for Telnet or Web
are selected, a lockout will be triggered when the number of invalid access attempts during the
defined Lockout Duration period exceeds the defined Hit Count for the protocol. For example,
if the Telnet Hit Count is set at 10 and the Telnet Lockout Duration period is set at 120 seconds,
then if over 10 invalid access attempts are detected within 120 seconds, the RPS will then lock
out the MAC address that generated the excessive attempts for 120 seconds.
Note that when an Invalid Access Lockout occurs, you can either wait for the Lockout Duration
period to elapse (after which, the RPS will automatically reactivate the port or protocol), or you
can issue the /UL command (type
/UL
and press
[Enter]
) via the Text Interface to instantly
unlock all RPS logical network ports and communication protocols.
Note:
If the Network Port has been locked by the Invalid Access Lockout feature, it
will still respond to the ping command (providing that the ping command has not been
disabled at the Network Port.)