How To Log The Tunnel Packets In A Cisco Router?


When you want to troubleshoot tunneling issues on a Cisco router, it can be helpful to be able to track the packets that are flowing through the tunnel. This article will show you how to use the Cisco IOS Command Line Interface (CLI) to log tunnel packets.

What is a Tunnel Packet?

A tunnel packet is a special type of Cisco router packet that is used to tunnel data between two routers. A tunnel packet is created when the data that needs to be tunneled is encapsulated inside of a UDP or TCP packet. The UDP and TCP headers are removed from the data before it is transmitted and reassembled on the receiving end.

How do tunnel packets work?

A tunnel packet is a special type of IP packet that is used to transport data over a network tunnel. Tunnel packets are created when a router creates a tunnel between two network segments.

A tunnel packet contains the following information:

  • Source and destination IP addresses
  • Protocol type (in this case, IP)
  • Destination port number
  • Source port number

Tunnel packets can be used to transport any type of traffic, but they are most commonly used to transport traffic between two routers in a network.

How to log tunnel packets in a Cisco router?

Logging tunnel packets in a Cisco router is necessary to troubleshoot and debug networking issues. To log tunnel packets:

  1. Launch the logging tool on the router.
  2. Enter the command show logging tunnel.
  3. To enable logging for all tunnels, enter the command logging tunnel all.
  4. To specify a tunnel for logging, enter the command logging tunnel .


After reading this article on how to log tunnel packets in a Cisco router, you will be able to keep track of all the traffic that is passing through your network. By logging tunnel packets, you will be able to troubleshoot problems more quickly and identify potential security risks. In addition, by understanding how tunnels work, you can better protect your network from attacks that use tunnels.

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