# Security Gateway drops GTP Echo Response traffic with the reason "Wrong Destination Port"

## Product
Carrier Security

## Version
R81 (EOS), R81.10 (EOS), R81.20

## OS
Gaia

## Last Modified
2025-01-20

## Symptoms

- Security Gateway drops GTP Echo Response traffic with the reason "Wrong Destination Port".

## Cause

By default, Security Gateway makes sure the GTP Echo Response packets contain the correct port:

- For GTPv0 - port 3386
- For GTPv1 - port 2123 or port 2152

## Solution

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#### NOTE

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

## Article Properties

Access Level: Advanced  
Status: Approved by TAC  
Date Created: 2023-09-24  
Last Modified: 2025-01-20