IPsec: You must open these ports

You can use the IPSEC protocol suite to communicate almost tap-proof over the Internet. In this practical tip, we will tell you which ports you have to release for use.

You need these ports for IPSEC

Depending on how you use IPSEC, you need different ports and protocols. So that nothing stands in the way of secure communication, all participants in the IPSEC should have released the following ports and protocols:

• The UDP ports 500 and 4500 as well as the IP protocol ESP.
• The TCP port 10000.

We will show you in another practical tip how you can release individual ports.