Cisco hidden tools: Testing TCP connection

Sometimes you have a connection between 2 routers that you want to test with something more than a ping. Cisco devices have a hidden command which is actually a very powerful testing tool for your TCP connection.

The command is “ttcp” and you will not find it in the the default list of commands of a Cisco device. So, even if you use help ( “?” mark at the router prompt) this command will not be showed to you.

For our testing we will use the same topology as in the previous posts. If you do not have it please download it here. Since this is a point-to-point TCP connection testing we will not use any fancy routing protocol or other networking protocols.

See the tutorial below:

• Cisco: DoS protection using TCP Intercept
• How to monitor IP SLA with free tools
• Cisco: Quick IOS check in 4 simple steps
• Cisco: How-to get notifications for IP SLA monitor using EEM
• Cisco: FWSM CPU stress test how-to