Skip to main content
sdabhade
Staff
sdabhade
Staff
October 23, 2024

Technical Tip: Logs regarding Source and Destination IP 127.0.0.1 with UDP port 12121

  • October 23, 2024
  • 0 replies
  • 3116 views
Description
 
This article describes how to interpret logs involving Source and Destination IP 127.0.0.1 with UDP port 12121.
 
Scope

 

FortiGate.

 

Solution

 

The following logs may appear for Source and Destination IP 127.0.0.1 using UDP port 12121.

 

TAP-DEVICE-LOGS-1.png

 

When FortiGate is configured with the below configuration, a log subscriber named 'tap-device' sends the miglogd logs to a local UDP port 12121 for WebSocket usage.

 

The address 127.0.0.1 always points to localhost, meaning the traffic remains within the FortiGate and does not leave the device, effectively looping internally. These logs do not cause any problems.

 

config log tap-device
    edit "custom"
        set status enable
        set port 12121
        set format json
    next
end

    Terms & ConditionsAccessibility statement