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MTU
Administrative
status
Configuring static routes
The System > Network > Routing tab displays a list of routes and lets you configure static
routes and gateways used by the FortiVoice Gateway.
Static routes direct traffic exiting the FortiVoice Gateway. You can specify through which
network interface a packet will leave, and the IP address of a next-hop router that is reachable
from that network interface. The router is aware of which IP addresses are reachable through
various network pathways, and can forward those packets along pathways capable of reaching
the packets' ultimate destinations.
A default route is a special type of static route. A default route matches all packets, and defines
a gateway router that can receive and route packets if no other, more specific static route is
defined for the packet's destination IP address.
You should configure at least one static route, a default route, that points to your gateway.
However, you may configure multiple static routes if you have multiple gateway routers, each of
which should receive packets destined for a different subset of IP addresses.
To determine which route a packet will be subject to, the FortiVoice Gateway compares the
packet's destination IP address to those of the static routes and forwards the packet to the
route with the large prefix match.
When you add a static route through the web-based manager, the FortiVoice Gateway evaluates
the route to determine if it represents a different route compared to any other route already
present in the list of static routes. If no route having the same destination exists in the list of
static routes, the FortiVoice Gateway adds the static route.
To view or configure static routes
1. Go to System > Network > Routing.
GUI field
Destination
IP/Netmask
Fortinet Technologies Inc.
Override default MTU value (1500): Enable to change the maximum
transmission unit (MTU) value, then enter the maximum packet or
Ethernet frame size in bytes.
If network devices between the FortiVoice Gateway and its traffic
destinations require smaller or larger units of traffic, packets may
require additional processing at each node in the network to
fragment or defragment the units, resulting in reduced network
performance. Adjusting the MTU to match your network can improve
network performance.
The default value is 1500 bytes. The MTU size must be between 576
and 1500 bytes. Change this if you need a lower value; for example,
RFC 2516 prescribes a value of 1492 for the PPPoE protocol.
Select either:
• Up: Enable (that is, bring up) the network interface so that it can
send and receive traffic.
• Down: Disable (that is, bring down) the network interface so that
it cannot send or receive traffic.
Description
Displays the destination IP address and subnet of packets subject to
the static route. A setting of 0.0.0.0/0.0.0 indicates that the route
matches all destination IP addresses.
Page 29
FortiVoice Gateway 5.3.6 Administration Guide
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