| 3TGKB-0059 | |
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Last Edited : |
23-06-06 |
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Revision : |
1.0 |
What are ports used by my VPN's - PPTP and L2TP!
This one comes up quite often on the security courses. The ports you need depend on which protocols you are using. For example if you are using IPSec with AH only then Protocol ID 51 is your target.
| L2TP | ||||
| Protocol | Protocol ID | Port | Direction | More Information |
| ESP | 50 | Inbound and Outbound | Encapsulating Security Payload | |
| AH | 51 | Inbound and Outbound | Authentication Header | |
| ISAKMP | UDP 500 | Inbound and Outbound | Internet Security Association and Key Management Protocol used for IKE key exchange | |
| Kerberos | UDP 88 | Needed if using Kerberos for IPSec Authentication | ||
| Kerberos | TCP 88 | Needed if using Kerberos for IPSec Authentication | ||
| PPTP | ||||
| Protocol | Protocol ID | Port | Direction | More Information |
| PPTP | TCP 1723 | Inbound and Outbound | ||
| GRE | 47 | Inbound and Outbound | Generic Route Encapsulation | |
References
233256 - How to Enable
IPSec Traffic Through a Firewall
179442 - How to configure a
firewall for domains and trusts
241251 - VPN Tunnels - GRE Protocol 47 Packet Description and Use
RegardsMatt Rowston
KB Keywords: PPTP, L2TP, VPN, security, firewall