Native plaintext tunneling protocols include Layer 2 Tunneling Protocol (L2TP) when it is set up without IPsec and Point-to-Point Tunneling Protocol (PPTP) or Microsoft Point-to-Point Encryption (MPPE).
* PPPoE (PPP (Point-to-Point Protocol) over Ethernet)* L2TP (Layer 2 Tunnelling Protocol) — используется в продуктах компаний Microsoft и Cisco.