Configuring FortiGate for Advanced IP Routing and ECMP

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After completing this document, you will be able to achieve these objectives:

  • Configure networking interfaces
  • Configure FortiGate as a DHCP server
  • Understand IP Routing concepts
  • Configure Static Routes and Reverse Path Forwarding
  • Implement Equal-Cost Multi-Path (ECMP) Routing
  • Configure Route Failover and Load Balancing

You Should Know:

1. Configuring FortiGate as a DHCP Server

config system dhcp server
edit 1
set interface "internal"
set lease-time 86400
set default-gateway 192.168.1.1
set netmask 255.255.255.0
set dns-service default
config ip-range
edit 1
set start-ip 192.168.1.100
set end-ip 192.168.1.200
next
end
next
end

2. Static Route Configuration

config router static
edit 1
set dst 10.0.0.0 255.255.255.0
set gateway 192.168.1.254
set device "port1"
next
end

3. ECMP Configuration

config system interface
edit "port1"
set ip 192.168.1.1 255.255.255.0
set allowaccess ping https ssh
next
edit "port2"
set ip 192.168.2.1 255.255.255.0
set allowaccess ping https ssh
next
end

config router static
edit 1
set dst 0.0.0.0 0.0.0.0
set distance 10
set priority 1
set device "port1"
next
edit 2
set dst 0.0.0.0 0.0.0.0
set distance 10
set priority 1
set device "port2"
next
end

4. Route Failover Configuration

config system link-monitor
edit "Failover-Monitor"
set srcintf "port1"
set server 8.8.8.8
set gateway-ip 192.168.1.254
set failtime 5
set recoverytime 5
next
end

5. Reverse Path Forwarding (RPF)

config system settings
set asymroute enable
end

6. Routing Table CLI Commands

get router info routing-table all
get router info routing-table details

What Undercode Say:

Configuring FortiGate for advanced IP routing and ECMP is essential for optimizing network performance and ensuring redundancy. By mastering DHCP server setup, static routes, ECMP load balancing, and route failover, you can build a robust and scalable network infrastructure. Use the provided commands to practice and implement these configurations in your environment. For further reading, refer to the official Fortinet Documentation.

Additional Linux/Windows Commands for Network Configuration:

  • Linux:
    ip route add 10.0.0.0/24 via 192.168.1.254 dev eth0
ip link set eth0 up
nmcli connection modify eth0 ipv4.method manual ipv4.addresses 192.168.1.2/24

  • Windows:

    route add 10.0.0.0 mask 255.255.255.0 192.168.1.254
netsh interface ip set address "Ethernet" static 192.168.1.2 255.255.255.0 192.168.1.1

By combining FortiGate configurations with Linux and Windows commands, you can achieve a seamless and efficient network setup.

References:

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