Hello nicholasscheetz,
I found this solution, can you tell me if it helps you?
To address the issue of dropped UDP traffic when switching to Fortinet SD-WAN, consider the following steps:
- Firewall Policy Configuration: Ensure that the firewall policies on the Fortinet device are correctly configured to allow the necessary UDP traffic. Check for any specific rules that might be blocking or restricting UDP packets.
- UDP Session Timeout: Verify the UDP session timeout settings on the Fortinet device. If the timeout is too short, it might cause sessions to drop prematurely.
- NAT Configuration: Check the NAT configuration to ensure that it is correctly translating the UDP traffic. Misconfigured NAT settings can lead to dropped packets.
- SD-WAN Rules: Review the SD-WAN rules to ensure that they are correctly prioritizing and routing UDP traffic. Incorrect rules might cause traffic to be routed through less optimal paths, leading to drops.
- Packet Fragmentation: Investigate if packet fragmentation is occurring, which can lead to dropped packets. Ensure that the MTU settings are correctly configured to prevent fragmentation.
- Offloading Settings: If hardware offloading is enabled, consider disabling it temporarily to see if it affects the traffic flow. Offloading can sometimes cause issues with certain types of traffic.
- Diagnostics and Logs: Use FortiGate's diagnostic tools and logs to identify where the traffic is being dropped. This can provide insights into whether the issue is with the Fortinet device or elsewhere in the network.
