23. PPTP PPTP Interface Encapsulado PPP IP Interface IP Header TCP Header Payload Data PPP Header IP GRE Header IP Header TCP Header Payload Data PPP Header IP Header TCP Header Payload Data IP Header TCP Header Payload Data PPP Header IP GRE Header IP Header Paquete TCP/IP Ehernet
24. Encapsulado L2TP/IPSec sobre IP L2TP Interface Encapsulado PPP UDP Interface IP Header TCP Header Payload Data PPP Header L2TP Header IP Header TCP Header Payload Data PPP Header IP Header TCP Header Payload Data IP Header TCP Header Payload Data PPP Header L2TP Header UDP Header Paquete TCP/IP Ehernet IP Header TCP Header Payload Data PPP Header L2TP Header UDP Header IPSec ESP Header IPSec Inteface IP Inteface IP Header TCP Header Payload Data PPP Header L2TP Header UDP Header IPSec ESP Header IP Header IPSec ESP Trailer IPSec ESP Trailer IPSec AUTH Trailer IPSec AUTH Trailer