{"id":11479,"date":"2011-08-16T13:24:57","date_gmt":"2011-08-16T13:24:57","guid":{"rendered":"https:\/\/www.techopedia.com\/definition\/layer-2-tunneling-protocol\/"},"modified":"2011-08-18T17:21:32","modified_gmt":"2011-08-18T17:21:32","slug":"layer-2-tunneling-protocol","status":"publish","type":"definition","link":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp","title":{"rendered":"Layer 2 Tunneling Protocol"},"content":{"rendered":"<h2><span id=\"what_does_layer_2_tunneling_protocol_mean\">What Does Layer 2 Tunneling Protocol Mean?<\/span><\/h2>\n<p>Layer 2 Tunneling Protocol (L2TP) is a computer networking protocol used by Internet service providers (ISPs) to enable virtual private network (VPN) operations. L2TP is similar to the Data Link Layer Protocol in the OSI reference model, but it is actually a session layer protocol.<\/p>\n<p>A User Datagram Protocol (UDP) port is used for L2TP communication. Because it does not provide any security for data such as encryption and confidentiality, an encryption protocol such as Internet Protocol security (IPsec) is often used with L2TP.<\/p>\n<p>This term is also known as Virtual Dialup Protocol.<\/p>\n<h2><span id=\"techopedia_explains_layer_2_tunneling_protocol\">Techopedia Explains Layer 2 Tunneling Protocol<\/span><\/h2>\n<p>Officially published in 1999, L2TP is an extension of Point-to-Point Tunneling Protocol (PPTP). It is the merger of two protocols, one from Microsoft (PPTP) and one from Cisco. L2TP saves the dial-up cost and overhead for any user willing to remotely connect with a site office. L2TP is known as Virtual Dialup Protocol because of its service of the Point-to-Point Protocol (PPP) extension over Internet.<\/p>\n<p>For example, suppose that a user in New York is connected with a traditional dial-up modem and is looking to communicate with someone in Sydney. For this purpose, the user gets a connection and establishes a dedicated link from New York to Sydney. This dedicated dial-up link will use a public switched telephone network (PSTN) and provide the lowest data transfer speed because of shared PSTN media. Thousands of other users are using the same medium, so the user will have an overall speed of 33 Kbps or worse.<\/p>\n<p>Instead, the user could use L2TP where PPP is used and configured at both ends (the ISP and the user site). Following the successful authentication of a user request, a tunnel is created for user data. When the tunnel is created, the user is open to start communication.<\/p>\n<p>Advantages of L2TP include:<\/p>\n<ul>\n<li>High data security is provided for critical applications.<\/li>\n<li>High-level encryption is used so that critical information is always safe and remains personal.<\/li>\n<li>It provides excellent and efficient connectivity.<\/li>\n<li>It is cost-effective and does not have overhead cost after implementation.<\/li>\n<li>It is reliable, scalable, fast and flexible.<\/li>\n<li>It is an industry-standard best for the corporate sector.<\/li>\n<li>It has the best authorization policy for users with VPN authentication.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>What Does Layer 2 Tunneling Protocol Mean? Layer 2 Tunneling Protocol (L2TP) is a computer networking protocol used by Internet service providers (ISPs) to enable virtual private network (VPN) operations. L2TP is similar to the Data Link Layer Protocol in the OSI reference model, but it is actually a session layer protocol. A User Datagram [&hellip;]<\/p>\n","protected":false},"author":7813,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_lmt_disableupdate":"","_lmt_disable":"","om_disable_all_campaigns":false,"footnotes":""},"definitioncat":[219],"class_list":["post-11479","definition","type-definition","status-publish","format-standard","hentry","definitioncat-networks"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.8 (Yoast SEO v23.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Layer 2 Tunneling Protocol (L2TP)? - Definition from Techopedia<\/title>\n<meta name=\"description\" content=\"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Layer 2 Tunneling Protocol\" \/>\n<meta property=\"og:description\" content=\"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\" \/>\n<meta property=\"og:site_name\" content=\"Techopedia\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/techopedia\/\" \/>\n<meta property=\"article:modified_time\" content=\"2011-08-18T17:21:32+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@techopedia\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\"},\"author\":{\"name\":\"Margaret Rouse\",\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/person\/f5dd538e31ee352d105b8af36c4268a5\"},\"headline\":\"Layer 2 Tunneling Protocol\",\"datePublished\":\"2011-08-16T13:24:57+00:00\",\"dateModified\":\"2011-08-18T17:21:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\"},\"wordCount\":385,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.techopedia.com\/#organization\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#respond\"]}],\"articleSection\":\"\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\",\"url\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\",\"name\":\"What is Layer 2 Tunneling Protocol (L2TP)? - Definition from Techopedia\",\"isPartOf\":{\"@id\":\"https:\/\/www.techopedia.com\/#website\"},\"datePublished\":\"2011-08-16T13:24:57+00:00\",\"dateModified\":\"2011-08-18T17:21:32+00:00\",\"description\":\"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.techopedia.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Networking\",\"item\":\"https:\/\/www.techopedia.com\/network\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Term\",\"item\":\"https:\/\/www.techopedia.com\/definition\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Layer 2 Tunneling Protocol\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.techopedia.com\/#website\",\"url\":\"https:\/\/www.techopedia.com\/\",\"name\":\"Techopedia\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.techopedia.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.techopedia.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.techopedia.com\/#organization\",\"name\":\"Techopedia\",\"url\":\"https:\/\/www.techopedia.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/08\/techopedia-light.svg\",\"contentUrl\":\"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/08\/techopedia-light.svg\",\"width\":209,\"height\":37,\"caption\":\"Techopedia\"},\"image\":{\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/techopedia\/\",\"https:\/\/x.com\/techopedia\",\"https:\/\/www.linkedin.com\/company\/techopedia\/\",\"https:\/\/www.youtube.com\/c\/Techopedia\"],\"publishingPrinciples\":\"https:\/\/www.techopedia.com\/about\/editorial-policy\",\"ownershipFundingInfo\":\"https:\/\/www.techopedia.com\/about\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/person\/f5dd538e31ee352d105b8af36c4268a5\",\"name\":\"Margaret Rouse\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.techopedia.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/02\/margaret-rouse-headshot.jpeg\",\"contentUrl\":\"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/02\/margaret-rouse-headshot.jpeg\",\"caption\":\"Margaret Rouse\"},\"description\":\"Margaret is an award-winning writer and educator known for her ability to explain complex technical topics to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles in the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret\u2019s idea of \u200b\u200ba fun day is to help IT and business professionals to learn to speak each other\u2019s highly specialized languages.\",\"sameAs\":[\"https:\/\/www.linkedin.com\/in\/margaretrouse\/\",\"https:\/\/x.com\/https:\/\/twitter.com\/@techdefinitions\"],\"knowsAbout\":[\"Technology expert\"],\"url\":\"https:\/\/www.techopedia.com\/contributors\/margaret-rouse\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What is Layer 2 Tunneling Protocol (L2TP)? - Definition from Techopedia","description":"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp","og_locale":"en_US","og_type":"article","og_title":"Layer 2 Tunneling Protocol","og_description":"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.","og_url":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp","og_site_name":"Techopedia","article_publisher":"https:\/\/www.facebook.com\/techopedia\/","article_modified_time":"2011-08-18T17:21:32+00:00","twitter_card":"summary_large_image","twitter_site":"@techopedia","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#article","isPartOf":{"@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp"},"author":{"name":"Margaret Rouse","@id":"https:\/\/www.techopedia.com\/#\/schema\/person\/f5dd538e31ee352d105b8af36c4268a5"},"headline":"Layer 2 Tunneling Protocol","datePublished":"2011-08-16T13:24:57+00:00","dateModified":"2011-08-18T17:21:32+00:00","mainEntityOfPage":{"@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp"},"wordCount":385,"commentCount":0,"publisher":{"@id":"https:\/\/www.techopedia.com\/#organization"},"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#respond"]}],"articleSection":""},{"@type":"WebPage","@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp","url":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp","name":"What is Layer 2 Tunneling Protocol (L2TP)? - Definition from Techopedia","isPartOf":{"@id":"https:\/\/www.techopedia.com\/#website"},"datePublished":"2011-08-16T13:24:57+00:00","dateModified":"2011-08-18T17:21:32+00:00","description":"This definition explains the meaning of Layer 2 Tunneling Protocol and why it matters.","breadcrumb":{"@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.techopedia.com\/definition\/26196\/layer-2-tunneling-protocol-l2tp#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.techopedia.com\/"},{"@type":"ListItem","position":2,"name":"Networking","item":"https:\/\/www.techopedia.com\/network"},{"@type":"ListItem","position":3,"name":"Term","item":"https:\/\/www.techopedia.com\/definition"},{"@type":"ListItem","position":4,"name":"Layer 2 Tunneling Protocol"}]},{"@type":"WebSite","@id":"https:\/\/www.techopedia.com\/#website","url":"https:\/\/www.techopedia.com\/","name":"Techopedia","description":"","publisher":{"@id":"https:\/\/www.techopedia.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.techopedia.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.techopedia.com\/#organization","name":"Techopedia","url":"https:\/\/www.techopedia.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.techopedia.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/08\/techopedia-light.svg","contentUrl":"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/08\/techopedia-light.svg","width":209,"height":37,"caption":"Techopedia"},"image":{"@id":"https:\/\/www.techopedia.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/techopedia\/","https:\/\/x.com\/techopedia","https:\/\/www.linkedin.com\/company\/techopedia\/","https:\/\/www.youtube.com\/c\/Techopedia"],"publishingPrinciples":"https:\/\/www.techopedia.com\/about\/editorial-policy","ownershipFundingInfo":"https:\/\/www.techopedia.com\/about"},{"@type":"Person","@id":"https:\/\/www.techopedia.com\/#\/schema\/person\/f5dd538e31ee352d105b8af36c4268a5","name":"Margaret Rouse","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.techopedia.com\/#\/schema\/person\/image\/","url":"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/02\/margaret-rouse-headshot.jpeg","contentUrl":"https:\/\/www.techopedia.com\/wp-content\/uploads\/2023\/02\/margaret-rouse-headshot.jpeg","caption":"Margaret Rouse"},"description":"Margaret is an award-winning writer and educator known for her ability to explain complex technical topics to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles in the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret\u2019s idea of \u200b\u200ba fun day is to help IT and business professionals to learn to speak each other\u2019s highly specialized languages.","sameAs":["https:\/\/www.linkedin.com\/in\/margaretrouse\/","https:\/\/x.com\/https:\/\/twitter.com\/@techdefinitions"],"knowsAbout":["Technology expert"],"url":"https:\/\/www.techopedia.com\/contributors\/margaret-rouse"}]}},"_links":{"self":[{"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/definition\/11479"}],"collection":[{"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/definition"}],"about":[{"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/types\/definition"}],"author":[{"embeddable":true,"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/users\/7813"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/comments?post=11479"}],"version-history":[{"count":0,"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/definition\/11479\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/media?parent=11479"}],"wp:term":[{"taxonomy":"definitioncat","embeddable":true,"href":"https:\/\/www.techopedia.com\/wp-json\/wp\/v2\/definitioncat?post=11479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}