only allow access to the services on the public interface that isaccessible from the Internet side). IP Protocol Type=UDP, UDP Port Number=4500 IP Protocol Type=UDP, UDP Port Number=500 IP Protocol=TCP, TCP Port number=443 IP Protocol Type=ESP (value 50) IP Protocol=GRE (value 47) IP Protocol=TCP, TCP Port number=1723 a firewall is placed between Internet and RRAS server), then following ports need to be opened (bidirectional) on this firewall to allow VPN traffic to pass through:. There are multiple scenarios:ġ) If RRAS based VPN server is behind a firewall (i.e. IKEv2 control path is over IKE and data path over ESP. L2TP tunnel traffic is carried over IPSec transport mode and IPSec protocol internally has a control path through IKE and data path over ESP. SSTP control and data path is over TCP. PPTP control path is over TCP and data path over GRE. Microsoft RRAS server and VPN client supports PPTP, L2TP/IPSec, SSTP and IKEv2 based VPN connection.
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