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NexLog Recorder User Manual v2.2.0
Dual NICs with Bonding Operation
When configured with NIC bonding, the dual network interface devices provide
failover operation. Because they share the same IP address, if one of the devices
or its connection should fail, the other device will maintain the network
connection.
For NIC bonding operation, you have the same option of using DHCP. Only, in
this case, it is automatically applied to both the primary and secondary network
devices. With DHCP enabled, the other network settings for both network
devices are set automatically by the DHCP server and cannot be changed
manually. The settings remain readable since the information, the IP address in
particular, may be needed to access the recorder remotely.
To configure two network devices with NIC bonding, change the Type to Bind on
each device, then save.
Once you have bound two devices together, they will be presented as a single
device, with an additional menu for Bond Type. This will let you configure the
kind of device bonding used.
Note:
After you have configured the network interface devices for NIC bonding
operation, if you change them back to separate operation, you will then have to
shut down and restart the recorder for the changes to take effect.
There are three types of NIC Binding available. Be sure to select the type that
matches the requirements of your network’s configuration.
0 (balance-rr): Round-robin policy: Transmit packets in sequential
order from the first available slave through the last. This mode
provides load balancing and fault tolerance.
1 (active-backup): Active-backup policy: Only one slave in the bond is
active. A different slave becomes active if, and only if, the active slave
fails. The bond's MAC address is externally visible on only one port
(network adapter) to avoid confusing the switch. This mode provides
fault tolerance.
2 (balance-xor): Transmit based on (source MAC address XOR’ed with
destination MAC address) modulo slave count). This selects the same
slave for each destination MAC address. This mode provides load
balancing and fault tolerance.
4.5.3. VNC Settings
VNC stands for "Virtual Network Computing" and is a standard protocol widely
used for accessing PC Desktops remotely over the network. If enabled, you will
be able to connect to the recorder over VNC using any standard VNC Client such
as RealVNC or TightVNC. When you connect to the Recorder via VNC, you will
be able to remotely view and interact with the Recorder's Front Panel. (Though