RFC 2661
E879421
RFC 2661 is an Internet Engineering Task Force (IETF) standard that specifies the Layer Two Tunneling Protocol (L2TP) used for creating virtual private networks (VPNs) over the internet.
All labels observed (1)
| Label | Occurrences |
|---|---|
| RFC 2661 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10628726 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: RFC 2661 Context triple: [RFC 1661, obsoletedBy, RFC 2661]
-
A.
RFC 1661
RFC 1661 is the original specification of the Point-to-Point Protocol (PPP), defining a standard method for transporting multi-protocol datagrams over point-to-point links.
-
B.
RFC 5661
RFC 5661 is the Internet Engineering Task Force (IETF) standard that specifies version 4.1 of the Network File System (NFS) protocol, detailing its architecture, operations, and extensions for distributed file access.
-
C.
RFC 3651
RFC 3651 is an IETF document that specifies the technical architecture and operational framework of the Handle System for assigning and resolving persistent digital identifiers.
-
D.
RFC 1651
RFC 1651 is an early Internet standards document that defined extensions to the Simple Mail Transfer Protocol (SMTP) to support enhanced email functionality.
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E.
RFC 2156
RFC 2156 is an Internet standards document that specifies the mapping between X.400 and RFC 822 (Internet) mail systems, updating and replacing earlier guidance on email interoperability.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: RFC 2661 Target entity description: RFC 2661 is an Internet Engineering Task Force (IETF) standard that specifies the Layer Two Tunneling Protocol (L2TP) used for creating virtual private networks (VPNs) over the internet.
-
A.
RFC 1661
RFC 1661 is the original specification of the Point-to-Point Protocol (PPP), defining a standard method for transporting multi-protocol datagrams over point-to-point links.
-
B.
RFC 5661
RFC 5661 is the Internet Engineering Task Force (IETF) standard that specifies version 4.1 of the Network File System (NFS) protocol, detailing its architecture, operations, and extensions for distributed file access.
-
C.
RFC 3651
RFC 3651 is an IETF document that specifies the technical architecture and operational framework of the Handle System for assigning and resolving persistent digital identifiers.
-
D.
RFC 1651
RFC 1651 is an early Internet standards document that defined extensions to the Simple Mail Transfer Protocol (SMTP) to support enhanced email functionality.
-
E.
RFC 2156
RFC 2156 is an Internet standards document that specifies the mapping between X.400 and RFC 822 (Internet) mail systems, updating and replacing earlier guidance on email interoperability.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Internet standard
ⓘ
Request for Comments ⓘ |
| abbreviation | L2TP specification ⓘ |
| appliesTo |
private IP networks
ⓘ
public Internet ⓘ |
| area | Routing Area ⓘ |
| category | Standards Track ⓘ |
| defines |
L2TP control message
ⓘ
L2TP data message ⓘ L2TP header format ⓘ L2TP session ⓘ L2TP tunnel ⓘ |
| definesProtocol |
L2TP
ⓘ
Layer Two Tunneling Protocol ⓘ |
| enables |
ISP-managed VPN services
ⓘ
remote access VPNs ⓘ tunneling of PPP over IP networks ⓘ |
| focusesOn | tunneling at layer two rather than encryption ⓘ |
| language | English ⓘ |
| obsoletedBy |
L2TPv3 specification
ⓘ
RFC 3931 ⓘ |
| obsoletes | RFC 2076 ⓘ |
| primaryUse |
VPNs
ⓘ
virtual private networks ⓘ |
| protocolLayer | layer two ⓘ |
| publishedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
Internet Engineering Task Force ⓘ |
| relatedTo |
PPP
ⓘ
Point-to-Point Protocol ⓘ |
| rfcNumber | 2661 ⓘ |
| securityConsiderations | relies on external mechanisms such as IPsec for encryption ⓘ |
| series |
RFC
ⓘ
linked to:
RFCs
|
| specifies |
AVP (Attribute-Value Pair) encoding for L2TP
ⓘ
control connection for L2TP tunnels ⓘ data encapsulation for L2TP sessions ⓘ error handling for L2TP ⓘ message formats for L2TP ⓘ session management procedures ⓘ tunnel establishment procedures ⓘ |
| standardsBody |
IETF Network Working Group
ⓘ
linked to:
Network Working Group
|
| status | Obsoleted ⓘ |
| title | Layer Two Tunneling Protocol "L2TP" ⓘ |
| transport |
IP networks
ⓘ
UDP ⓘ |
| usesPort | UDP port 1701 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: RFC 2661 Description of subject: RFC 2661 is an Internet Engineering Task Force (IETF) standard that specifies the Layer Two Tunneling Protocol (L2TP) used for creating virtual private networks (VPNs) over the internet.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.