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Load Balancing & Fault Tolerance
Tunnel Routing
Source
Destination
Service
Group
Fail-Over
192.168.2.10
192.168.1.10
Any
Tunnel Group AB
Tunnel:
BackupGroup
192.168.2.10
192.168.1.11
Any
Tunnel Group AB
Tunnel:
BackupGroup
192.168.2.10
192.168.1.12
Any
Tunnel Group AB
Tunnel:
BackupGroup
192.168.2.11
192.168.1.10
Any
Tunnel Group AB
NO-ACTION
192.168.2.11
192.168.1.11
Any
Tunnel Group AB
NO-ACTION
192.168.2.11
192.168.1.12
Any
Tunnel Group AB
NO-ACTION
192.168.2.12
192.168.1.10
Any
Tunnel Group AB
Auto Routing
192.168.2.12
192.168.1.11
Any
Tunnel Group AB
Auto Routing
192.168.2.12
192.168.1.12
Any
Tunnel Group AB
Auto Routing
In the example above, Source of every default rule is specified with single IPv4 address. It is a easier way that set up
default rules by specifying Source with a IPv4 range, IPv4 subnet, LAN or DMZ.
Default Rule gives a great help to establish fully-connected routing rules while constructing an Intranet on many
branch sites via Tunnel Routing. Consider an Intranet deployment over three branch sites, only three default rules
(each one on a branch site) are required to establish the fully connection over the three sites, which requires six routing
rules without using Default Rule.
Default Rule refers the configurations of LAN and DMZ in Network Setting to negotiate the routing rules if the Source
is specified as LAN or DMZ for a default rule. It is necessary to re-apply the configurations of Default Rule to trigger the
negotiation and update the default rules if any change to LAN or DMZ networks setting.
Persistent Rules
Traffic that a persistent rule matches is transferred via a fixed tunnel (WAN link). Tunnel Routing transfers the first
packet of a session through a tunnel according to the specified balancing algorithm. Persistent routing then marks this
tunnel for the session, so that the subsequent packets of the session will be transferred directly via the same tunnel
(GRE encapsulated directly with the source and destination of the tunnel) without evaluation against routing rules and
balancing algorithms until this session disconnects or timeout. For any new session that a persistent rule matches,
only the first packet of the session will be processed with routing rules and balancing algorithms. Persistent routing
makes Tunnel Routing degenerate into traditional tunnel transmission (transfer every single session via one WAN
link), which provides no load balancing and fault tolerance to single session; even so, multiple sessions (not packets)
are still distributed over multiple WAN links (similar concept as Auto Routing). Note that setting of the filed "Fail-Over"
of a routing rule (or a default rule) is invalid for sessions that are routed persistently to fixed tunnels.
Source
:
The source of the connection (See "
").
Destination
:
The destination of the connection (See "
").
150
FortiWAN Handbook
Fortinet Technologies Inc.