NETWORK Tab
Scenario #1
If the connection to LAN2 fails, LAN2 becomes backup and LAN3 becomes active. After
repairing the connection, the user can manually reconfigure LAN2 as the Active port. While
LAN3 is working, LAN2 will remain as backup. It is only if and when LAN3 fails, LAN2 will
become Active. LAN2 does not automatically replace LAN3 while LAN3 is working correctly.
Reconfigure LAN2 as the Active port:
1. In the "LAN2 Configuration" window, select the "Redundant" checkbox, select "Active",
and then click the APPLY button.
2. On the NETWORK - Ethernet page, click the APPLY button.
To release a redundant bond, deselect the "Redundant" checkbox and apply the changes. If
the bond doesn't release, reboot the SyncServer.
Scenario #2
Following scenario #1, the backup LAN2 is repaired and available again to be the Active
port. If LAN3 now fails, LAN2 will takeover as the Active port.
Scenario #3
Following scenario #1, the backup LAN2 is not repaired, and now LAN3 fails. Connections
are not available.
For more information see Port Bonding (on page 30)
Allowed Access: Restricts the LAN port to access by specified IP addresses or address
ranges. If the user leaves this field blank, the LAN port accepts connections from any IP
address. Allowed Access applies to all forms of network traffic, including NTP and HTTP con-
nections. Reconfiguring the IP address of the LAN port erases the Allowed Access list.
The user can specify address ranges by setting the IP address followed by the mask prefix
length, as described RFC 1518 and RFC 1519 for Classless Interdomain Routing. The
mask prefix length specifies the number of masked bits starting from the left-most pos-
ition. For example, to allow access from the network represented by 192.168.0.0,
255.255.0.0, the user would enter 192.168.0.0/16. In other words, the first 16 bits of the
address, 192.168, are masked bits representing the network address The remaining bits are
host address which is set to 0.
Note: When configuring Allowed Access, take care to avoid blocking DNS, HTTP, NTP,
SMTP, SNMP, and SSH traffic.
Side Effects
Applying changes to the Ethernet port configuration restarts the NTP and xinetd daemons
(services). During that time:
n The NTP daemon, NTP stratum, web interface are temporarily unavailable.
n The Status LEDs, NTP stratum, and Alarms change states.
997-01520-02 Rev. G2.......................................................................... Page 29
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