Secure Sockets Tunneling Protocol
Introduced in Windows Server 2008, Secure Sockets Tunneling Protocol (SSTP) was specifically developed to get around the difficulties of setting up VPN tunnels through corporate firewalls, which block many of the ports and protocols used by PPTP and L2TP. The SSTP tunnel uses the HTTP over SSL (HTTPS) protocol, which is widely supported for secure web traffic. SSTP uses port 443 for the connection.
The tunneling protocol functions by encapsulating the original IP packet with a PPP header and then an SSTP header. The SSTP header, the PPP header, and the original IP packet are all encrypted by the SSL session. Finally, an IP header is added to the packet and it is routed to the destination. The structure of the ...
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