What Ports does Microsoft RAS use?

Posted on 2009-04-15
Last Modified: 2012-05-06

I have the following setup. An Internet connection (20MB) to a Alcatel-Lucent Firewall that is doing Firewall, NAT. I have setup a Windows Server 2003 Server on the DMZ zone with only one interface. I have:

-Setup RAS on this server over that interface
-Created a NAT with a public IP and left it open for testing purposes.
-Tested Connectivity and connection works fine.

Now, in order to deploy this solution I need to know what ports does RAS uses in order to allow traffic from the Internet only for these ports,

Any ideas?

Question by:yupinel14
    1 Comment
    LVL 38

    Accepted Solution

    It depends on what form of encryption you are using.  PPTP uses TCP port 1723. For authentication using the VPN tunnel with PPTP you also need to have Protocol 47 (GRE) allowed on the router.  IPSEC/L2TP uses UDP ports 500 (IKE), 5500 and 1701.

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