FortiGate-6000 IPsec VPN load balancing
Since the FortiGate-6000 does not support IPsec VPN load balancing, the following option should always be disabled:
config load-balance setting
set ipsec-load-balance disable
end
Disabling IPv4 IPsec VPN load balancing in this way enables the following flow rules:
IPv4 IPsec flow rules with ipsec-load-balance disabled
edit 21
set status enable
set vlan 0
set ether-type ipv4
set src-addr-ipv4 0.0.0.0 0.0.0.0
set dst-addr-ipv4 0.0.0.0 0.0.0.0
set protocol udp
set src-l4port 0-0
set dst-l4port 500-500
set action forward
set forward-slot master
set priority 5
set comment "ipv4 ike"
next
edit 22
set status enable
set vlan 0
set ether-type ipv4
set src-addr-ipv4 0.0.0.0 0.0.0.0
set dst-addr-ipv4 0.0.0.0 0.0.0.0
set protocol udp
set src-l4port 0-0
set dst-l4port 4500-4500
set action forward
set forward-slot master
set priority 5
set comment "ipv4 ike-natt dst"
next
edit 23
set status enable
set vlan 0
set ether-type ipv4
set src-addr-ipv4 0.0.0.0 0.0.0.0
set dst-addr-ipv4 0.0.0.0 0.0.0.0
set protocol esp
set action forward
set forward-slot master
set priority 5
set comment "ipv4 esp"
next
These flow rules should generally handle all IPv4 IPsec VPN traffic. You can also adjust them or add your own flow rules if you have an IPv4 IPsec VPN setup that is not compatible with the default flow rules.