Load Balancing & Fault Tolerance Inbound Load Balancing and Failover (Multihoming)
NS Record :
l Name server: Enter the prefix of domain name (e.g. if the FQDN of the host
is "ns1.abc.com", enter "ns1")
l IP address: Enter the corresponding IP address of the domain name.
Note that Multihoming only answer IP addresses of the name servers (NS Records) correspond to the sub-domains.
Please make sure external name servers of the sub-domains are active well for DNSqueries.
Relay Mode
When Relay is enabled, FortiWAN will relay the DNS requests it receives to a specified name servers, and reprocess
the answer with appropriate IP address according to the AAAA/A record policies. The necessary configurations for
Multihoming in Relay Mode are AAAA/A Record Policy and Domain Settings. The name server the Multihoming Relay
Mode forward a DNS request to must be configured in field "Domain Settings". Only if the AAAA/A record of the
request answer that the name serve responds to FortiWAN matches Multihoming's AAAA/A Record, the request
answer will be reprocesses with appropriate IP address according to the AAAA/A record policies, otherwise,
Multihoming will simply forward the DNS answer to client without any changing. Please make sure the same
configuration of AAAA/A record on both FortiWAN Multihoming and the specified name server working
with Multihoming Relay Mode.
Note that it's necessary to update the registrations on your parent domain with FortiWAN's localhost IP addresses, so
that a request for your domain can be delivered to FortiWAN and forwarded to the specified name server.
For other query type such as MX and TXT, Multihoming's Relay Mode will simply forward the answer from the
specified name server to clients.
Policy Settings: A / AAAA Record Policy
Policy Name :
For assigning name to policies. It is recommended to give descriptive names to avoid
future confusion.
T : Check to enable threshold function to the policy. Administrators can configure the
downstream and upstream threshold of each WAN link on the configuration page of
WAN Setting (See "Configuring your WAN"). WAN links with traffic that exceeds the
threshold values will be considered as failed to Multi-Homing, and the other WAN links
will be replied according to the configured A / AAAA Record Policy.
Algorithm :
The algorithm for selecting WAN links,for DNS queries (See "Load Balancing & Fault
Tolerance"):
l By Weight: answer DNS queries by weight.
l By Downstream: answer DNS queries by selecting the WAN link with the
lightest downstream traffic load.
l By Upstream: answer DNS queries by selecting the WAN link with the lightest
upstream traffic load.
l By Total Traffic: answer DNS queries by selecting the WAN link with the
lightest total traffic load.
l By Optimum Route: answer DNS queries by selecting the best WAN link
according to “Optimum Route Detection”.
l By Static: answer DNS queries by replying A records of specified static IPs.
97 FortiWAN Handbook
Fortinet Technologies Inc.
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