Multiple Default Gateway; Dead Gateway Detection - Novell NETWARE 6-DOCUMENTATION Manual

Multiple Default Gateway

Dead Gateway Detection

Multiple NIC Single IP Address—Here the clients use the same IP address
to communicate with the server. This is achieved through using the round
robin method of distributing the NIC addresses for the ARP requests sent by
the clients. This solution avoids the extra configuration and transparently
achieves the load balancing for incoming packets. During a NIC failure, the
server sends a message to the clients to forcefully use them as the other
interface's MAC address.
Secondary IP Address (Multiple Logical Hosts)—With this type of
multihoming it is possible to create multiple logical hosts belonging to the
same network. In a multihoming setup where multiple NICs are grouped to
support a single network, the secondary IP address with this type of
configuration supports an option to select one of the NICs in the group. By
using the non-ARPable option, these addresses can be used as virtual IP
addresses for load balancing solutions. Through this option, the same IP
address can be configured on all servers and the load balancer can distribute
the client load across these servers.
For more information on this, see
and "Configuring Fault Tolerance" on page
This feature stretches the existing Default Gateway (Default Router) feature,
by allowing you to configure multiple default gateways on your network.
When a default gateway goes offline, the Dead Gateway Detection feature
detects this and uses the Multiple Default Gateway list to switch to the next
preferred default gateway, making your network fault tolerant.
For more information on this, see
Static Route)" on page
This feature is used with the Multiple Default Gateway feature. When the
current default gateway goes offline, this feature detects the failure and
automatically enables the next preferred default gateway from the Multiple
Default Gateway list to act as the current default gateway. When a dead default
gateway with a higher preference is again online, this feature detects this and
switches back to the default gateway with the higher preference.
For more information on this, see
page 74 and "Configuring Dead Gateway Detection" on page
"Configuring Load Balancing" on page 75
"Configuring a Default Gateway (LAN
71.
"Enabling Dead Gateway Detection" on
75.
74.
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