Tip

Using the router to find TCP/UDP ports

To find out what TCP/UDP ports are being used by an application, simply make up a temporary access-list (ACL) and debug it on your router. For example, to find out what ports PCANYWHERE uses, make a temporary ACL and debug it.
Example:

access-list 199 permit ip host 123.123.123.123 any
and add another line that says "access-list 199 permit ip any host 123.123.123.123."
Then run the following command: "debug ip packet detail 199." Make sure you clear IP routes and cache and do a term mon before debugging and you will see the ports 5631 and 5632 for PCANYWHERE. Just make sure to do a u all to disable all debugging when finished.

    Requires Free Membership to View

This was first published in May 2001

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.