Allied Telesis AR400 Series Router - Manual (Page 49)

Getting Started with the Graphical User Interface (GUI) 49
Software Release 2.6.1
C613-02021-00 REV D
Problem You are receiving email notifications for “attacks” that actually are not
attacks.
Solution Your alarm thresholds may be set too low (Configuration > Firewall > Events >
Alarms tab). Be careful when increasing the thresholds, because if the threshold
is too high, you may not be warned about actual attack attempts.
Problem The time in log packets is incorrect.
Solution See “Time and NTP” on page 49.
Time and NTP
Diagnosis The router’s time is displayed on the Configuration > System > Time tab. It will
also be included in log packets.
Problem The router’s time does not change, even though you entered the correct time.
Solution Changing the time is a 3-step process. Select Configuration > System > Time.
First, enter a time that is very shortly in the future (e.g. 20 seconds later than
the current time). Then check Set time. Then wait until precisely the time you
have entered, and click Apply.
Problem The router is not assigning the time to devices on the LAN.
Solutions ■ Check NTP is enabled (Configuration > System > Time).
■ Check that the NTP peer’s IP address is entered correctly.
■ Check that the NTP peer can reach the router, by pinging the router from
the NTP peer. Note that you will not get a response if Respond to ping is
unchecked on the Firewall Policy Options page (Configuration > Firewall >
Interfaces > Policy options tab). This option is checked by default.
■ Check that the router’s link to the LAN is functioning. See “Traffic Flow and
Network Address Translation (NAT)” on page 45.
Problem The router’s clock does not synchronise with the NTP peer.
Solution ■ The router’s clock can only synchronise with the NTP peer if its initial time
is similar to the NTP peer’s time (after setting the UTC offset). Manually
set the router’s time so that it is approximately correct, and enable NTP
again.
■ Check that the UTC offset is correct.
Problem The router’s time is incorrect, even though it assigns the correct time to
devices on the LAN.
Solution The UTC offset is probably incorrect, or needs to be adjusted for the beginning
or end of summer time. To correct this, select Configuration > System > Time
and enter the correct offset.