Talk:Layer 2 Tunneling Protocol

Computing: Networking / Security Low‑importance

This article is within the scope of WikiProject Computing, a collaborative effort to improve the coverage of computers, computing, and information technology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ComputingWikipedia:WikiProject ComputingTemplate:WikiProject ComputingComputing articles

Low

This article has been rated as Low-importance on the project's importance scale.

This article is supported by Networking task force (assessed as Mid-importance).

This article is supported by WikiProject Computer Security (assessed as Mid-importance).

Things you can help WikiProject Computer Security with:

Article alerts will be generated shortly by AAlertBot. Please allow some days for processing. More information...

Review importance and quality of existing articles
Identify categories related to Computer Security
Tag related articles
Identify articles for creation (see also: Article requests)
Identify articles for improvement
Create the Project Navigation Box including lists of adopted articles, requested articles, reviewed articles, etc.
Find editors who have shown interest in this subject and ask them to take a look here.

Undated anonymous question

is it just me or did l2tpd.org vanish?

Yes, the company hosting that domain lost interest and a domain hijacker took it. Check out the news at https://sourceforge.net/projects/l2tpd/

I just noticed that. Those hijackers are really completely sickening. :-( Anyway, I just noticed this page mentions that PPTP is a Microsoft technology, while the PPTP Wikipedia page says it's invented by Cisco and licenses by Microsoft. What's true?

L2TP/IPSec

Thought that a section on these would be useful. Unfortunately, I forgot to sign in, so it's not attributed to me. If you have questions, my username follows. If anyone has a nice picture of the full encapsulation (IP-ESP-UDP-PPP-L2TP-Private IP-TCP/UDP-Data), it would help understanding. Scorpiuss 17:13, 8 February 2006 (UTC)[reply]

Doesn't PPP follow L2TP? Iglam 01:36, 18 October 2007 (UTC)[reply]

Be sure to consider MTU when implementing L2TP. Doesn't sound too informative, kind of like "be sure to consider the steering wheel while driving a car". Should be explained, or removed.

The correct name is L2TP/IPsec, not L2TP/IPSec (see RFC).

L2TP/IP ?

Is it common to establish L2TP-tunnel over a completely insecure channel, i. e. IP without IPsec over it? I just wonder whether SOHO routers really implement IPsec when connecting to ISP in L2TP mode. At least, they don't support MPPE encryption for PPPoE and PPTP tunnels (for performance reasons, I suppose), so it's very doubtful that they will do IPsec encryption, even the most simple one, 3DES. Moreover, the throughput in L2TP mode can be in fact higher than in PPPoE / PPTP modes, which can be a direct indication of cryptographical absence. 213.234.235.82 (talk) 13:20, 12 February 2009 (UTC)[reply]

Section on Windows implementation is just wrong

The section on the Windows L2TP implementation seems to be a reworked copy of the "IPsec without L2TP" section of this document here: http://www.jacco2.dds.nl/networking/vista-openswan.html. As such it is describing raw IpSec-RA or IpSec-L2L, (not "L2TP without IPsec") which has absolutely nothing to do, of course, with L2TP. (140.232.0.70 (talk) 14:33, 23 September 2010 (UTC))[reply]

What is the purpose of this section anyway? I suggest we remove this section. — Preceding unsigned comment added by 2A00:865:A88E:A820:0:0:0:19E (talk) 10:31, 21 April 2015 (UTC)[reply]

Agreed! IMHO, I agree with removal or rewrite. It seems pointless, especially as Windows Server has supported L2TP without all the shenanigans apparently required or hinted at by this article. It's just FUD. Seems like more of a diatribe over a getting a narrow L2TP server to work with Windows Vista, without all the other support structure of L2TP in the real world (IPSEC). Not sure it needs to be here, very few people would do this.

Jgwinner (talk) 21:00, 2 November 2015 (UTC)[reply]

Renaming page for better accuracy

I am planning to rename this page to "Layer 2 Tunneling Protocol", as this is the correct title. Any comments? Web-Crawling Stickler 18:52, 8 March 2007 (UTC)[reply]

Which OSI model layer??

I have a book that says L2TP resides in the data-link layer (layer 2) of the OSI. Than this page says its in the session (layer 5) layer. Also, on the wikipedia article on the OSI Model, it is listed in the transport layer (layer 4). I am pretty confused... —Preceding unsigned comment added by 70.4.225.206 (talk) 22:04, 19 July 2008 (UTC)[reply]

This is a somewhat old post and I don't see any mention of OSI in the current version of this article. Still I thought i'd address it.

The problem is that OSI was based on a fixed idea of how a network should look. Real networks don't fit that model but authors often see the need to force them to fit anyway. Tunneling protocols are especially difficult because from the perspective of the user of the tunnel they are a link layer protocol but from the perspective of the network carrying the tunnel they are an application or transport layer protocol (TCP/IP doesn't really have presentation or session layers). Plugwash (talk) 16:01, 6 August 2013 (UTC)[reply]

Road Warrior-style?

The page reads:

The help info does say that IPsec without L2TP is not to be used for Road Warrior-style VPNs. They advise to use L2TP/IPsec or PPTP for that.

What on earth is a Road Warrior-style VPN? —Preceding unsigned comment added by 66.74.218.162 (talk) 22:11, 3 May 2009 (UTC)[reply]

Removed contents copied from IBM Infocenter

This edit[1] added contents taken from IBM's Infocenter and is therefore removed:

Fontoponto (talk) 06:58, 18 September 2010 (UTC)[reply]

USRobotics?

This article says that PPTP is from US Robotics, while PPTP says it's from Microsoft, 3Com, and others.

Which is correct? --MathsPoetry (talk) 07:59, 21 September 2013 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just modified 2 external links on Layer 2 Tunneling Protocol. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 21:33, 18 December 2017 (UTC)[reply]

Layer 2 tunnelling protocol provides a layer 2 tunnel through which layer 1 is passed.

So the statement in the lead paragraph that "it provides a tunnel for Layer 2" is confusing because it is wrong. Layer 3 is a tunnel for layer 2: layer 2 is a tunnel for layer 1: layer 1 is a point to point protocol. Let's think of some other ways of saying it correctly: "The protocol provides a layer 2 tunnel" , "The protocol provides a tunnel through which layer 1 is passed"

Internet Protocol is not a provider for IP packets. TCP is not a provider for Transmission Control Packets. The Layer 2 protocol isn't a "provider" for layer 2: it's a 'protocol' for layer 2: it's a "provider" for layer 1 and/or layer 3.

‘When I use a word,’ Humpty Dumpty said in rather a scornful tone, ‘it means just what I choose it to mean–neither more nor less.’, and that's Wikipedia editing. But for Wikipedia readers it's helpful if we stick to the common meaning of words and terms. 1.159.36.184 (talk) 10:39, 29 May 2023 (UTC)[reply]