{"id":689,"date":"2006-05-19T21:30:00","date_gmt":"2006-05-19T21:30:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2006\/05\/creating-rj45-ethernet-loopback-cable.htm"},"modified":"2007-03-09T13:54:10","modified_gmt":"2007-03-09T13:54:10","slug":"creating-rj45-ethernet-loopback-cable","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2006\/05\/creating-rj45-ethernet-loopback-cable.htm","title":{"rendered":"Creating an RJ45  Ethernet loopback cable"},"content":{"rendered":"<p><!--114807576927189385-->Sometimes it&#8217;s handy to make a PC think that it is connected to a network, even if there isn&#8217;t one physically present (e.g. in a test environment where not all services are replicated).  This is quite easy to achieve, with an <a href=\"http:\/\/www.juniper.net\/techpubs\/software\/nog\/nog-interfaces\/html\/fe-ge-loopback25.html\">RJ45 Ethernet loopback cable<\/a>.  By using 6&#8243; lengths of the core from a CAT5 Ethernet cable to connecting pin 1 to pin 3 and pin 2 to pin 6, a simple device is created which will fool a network interface card into thinking it is connected to a network.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/rj45-loopback.jpg?w=700&#038;ssl=1\" alt=\"RJ45 Ethernet loopback cable\" border=\"0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sometimes it&#8217;s handy to make a PC think that it is connected to a network, even if there isn&#8217;t one physically present (e.g. in a test environment where not all services are replicated). This is quite easy to achieve, with an RJ45 Ethernet loopback cable. By using 6&#8243; lengths of the core from a CAT5 &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/05\/creating-rj45-ethernet-loopback-cable.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Creating an RJ45  Ethernet loopback cable<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[],"tags":[24],"class_list":["post-689","post","type-post","status-publish","format-standard","hentry","tag-networking-hardware"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Creating an RJ45 Ethernet loopback cable - markwilson.it<\/title>\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.markwilson.co.uk\/blog\/2006\/05\/creating-rj45-ethernet-loopback-cable.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Creating an RJ45 Ethernet loopback cable - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"Sometimes it&#8217;s handy to make a PC think that it is connected to a network, even if there isn&#8217;t one physically present (e.g. in a test environment where not all services are replicated). This is quite easy to achieve, with an RJ45 Ethernet loopback cable. By using 6&#8243; lengths of the core from a CAT5 &hellip; Continue reading Creating an RJ45 Ethernet loopback cable\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/05\/creating-rj45-ethernet-loopback-cable.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2006-05-19T21:30:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2007-03-09T13:54:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.markwilson.co.uk\/blog\/images\/rj45-loopback.jpg\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Creating an RJ45 Ethernet loopback cable\",\"datePublished\":\"2006-05-19T21:30:00+00:00\",\"dateModified\":\"2007-03-09T13:54:10+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm\"},\"wordCount\":94,\"commentCount\":27,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/rj45-loopback.jpg\",\"keywords\":[\"Networking hardware\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm\",\"name\":\"Creating an RJ45 Ethernet loopback cable - markwilson.it\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/rj45-loopback.jpg\",\"datePublished\":\"2006-05-19T21:30:00+00:00\",\"dateModified\":\"2007-03-09T13:54:10+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#primaryimage\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/rj45-loopback.jpg\",\"contentUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/rj45-loopback.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/05\\\/creating-rj45-ethernet-loopback-cable.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Creating an RJ45 Ethernet loopback cable\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/\",\"name\":\"markwilson.it\",\"description\":\"get-info -class technology | write-output &gt; 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