| 1274 | The COSINE and Internet X.500 SchemaP. Barker, S. Kille · obsoleted by RFC 4524 | Proposed Standard | November 1991 |
| 1598 | PPP in X.25W. Simpson | Proposed Standard | March 1994 |
| 1618 | PPP over ISDNW. Simpson | Proposed Standard | May 1994 |
| 1700 | Assigned NumbersJ. Reynolds, J. Postel · obsoleted by RFC 3232 | Historic | October 1994 |
| 1701 | Generic Routing Encapsulation (GRE)S. Hanks, T. Li, D. Farinacci, P. Traina | Informational | October 1994 |
| 1853 | IP in IP TunnelingW. Simpson | Informational | October 1995 |
| 1973 | PPP in Frame RelayW. Simpson | Proposed Standard | June 1996 |
| 1990 | The PPP Multilink Protocol (MP)K. Sklower, B. Lloyd, G. McGregor, D. Carr, T. Coradetti | Draft Standard | August 1996 |
| 2002 | IP Mobility SupportC. Perkins, Ed. · obsoleted by RFC 3220 | Proposed Standard | October 1996 |
| 2004 | Minimal Encapsulation within IPC. Perkins | Proposed Standard | October 1996 |
| 2107 | Ascend Tunnel Management Protocol - ATMPK. Hamzeh | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2341 | Cisco Layer Two Forwarding (Protocol) "L2F"A. Valencia, M. Littlewood, T. Kolar | Historic | May 1998 |
| 2364 | PPP Over AAL5G. Gross, M. Kaycee, A. Li, A. Malis, J. Stephens | Proposed Standard | July 1998 |
| 2402 | IP Authentication HeaderS. Kent, R. Atkinson · obsoleted by RFC 4302, RFC 4305 | Proposed Standard | November 1998 |
| 2406 | IP Encapsulating Security Payload (ESP)S. Kent, R. Atkinson · obsoleted by RFC 4303, RFC 4305 | Proposed Standard | November 1998 |
| 2434 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 5226 | Best Current Practice | October 1998 |
| 2637 | Point-to-Point Tunneling Protocol (PPTP)K. Hamzeh, G. Pall, W. Verthein, J. Taarud, W. Little, G. Zorn | Informational | July 1999 |
| 2661 | Layer Two Tunneling Protocol "L2TP"W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter | Proposed Standard | August 1999 |