Technical Tip: Outbound Traffic Shaping for IPSec

AnthonyH · ‎07-07-2024

Description

This article describes how to apply traffic shaping (QoS) to throttle outbound traffic.

Scope

FortiGate.

Solution

In this example, traffic shaping will be demonstrated over IPsec and throttling outbound RDP on FGT_A.

Topology:

LAN (172.16.10.0/24) == FGT_A ==IPSEC TUNNEL== FGT_B == LAN(192.168.36.0/24)

FGT_A’s Configuration.

Firewall Policy:

config firewall policy
edit 6
set srcintf "port1"
set dstintf "toFGT_B"
set action accept
set srcaddr "toFGT_B_local" <-- Source address 172.16.10.0/24
set dstaddr "toFGT_B_remote" <-- Destination address 192.168.36.0/24
set schedule "always"
set service "RDP"
next
end

Static Route:

config router static
edit 2
set device "toFGT_B" <-- VPN Tunnel
set dstaddr "toFGT_B_remote" <----- Destination to 192.168.36.0/24.
next
end

Traffic Shaper:

config firewall shaper traffic-shaper
edit "1MB-Shaper-Throttle"
set maximum-bandwidth 1024
next
end

Traffic Shaping Policy:

config firewall shaping-policy
edit 1
set name "RDP_Shaping"
set service "RDP"
set srcintf "port1"
set dstintf "toFGT_B"
set traffic-shaper "1MB-Shaper"
set srcaddr "toFGT_B_local"
set dstaddr "toFGT_B_remote"
next
end

FGT_B's Configuration.

Firewall Policy:

config firewall policy
edit 1
set name "vpn_toFGT_A_remote"
set srcintf "toFGT_A"
set dstintf "port2"
set srcaddr "toFGT_A_remote" <----- Source address 172.16.10.0/24.
set dstaddr "toFGT_A_local" <----- Destination address 192.168.36.0/24.
set action accept
set schedule "always"
set service "RDP"
next
end

Static Route:

config router static
edit 2
set device "toFGT_A"
set dstaddr "toFGT_A_remote" <----- Destination to 172.16.10.0/24.
next
end

For testing, a file transfer from 172.16.10.2 to 192.168.36.2 will performed over RDP:

On the host 172.16.10.2, ~1MB are sent:

host_172.16.10.2.png

On host device 192.168.36.2, ~1MB are received:

host_192.168.36.2.png

On FGT_A under Policy & Objects -> Traffic Shaping, the shaper created is throttling the transfer over RDP:

Related document:

Traffic shaping

Technical Tip: Outbound Traffic Shaping for IPSec

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