{"id":4056,"date":"2026-02-23T15:22:25","date_gmt":"2026-02-23T20:22:25","guid":{"rendered":"https:\/\/increasec.com\/?p=4056"},"modified":"2026-03-03T10:48:47","modified_gmt":"2026-03-03T15:48:47","slug":"tailscale-routing-problem","status":"publish","type":"post","link":"https:\/\/increasec.com\/?p=4056","title":{"rendered":"Tailscale routing problem"},"content":{"rendered":"\n<p>When you use Ubuntu as a tailscale router, IP Forwarding is turned off by default, you may get the misconfigured error message below<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"506\" height=\"204\" src=\"https:\/\/increasec.com\/wp-content\/uploads\/2026\/02\/image-4.png\" alt=\"\" class=\"wp-image-4079\" srcset=\"https:\/\/increasec.com\/wp-content\/uploads\/2026\/02\/image-4.png 506w, https:\/\/increasec.com\/wp-content\/uploads\/2026\/02\/image-4-300x121.png 300w\" sizes=\"auto, (max-width: 506px) 100vw, 506px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Solution:<\/p>\n\n\n\n<p>nano \/etc\/sysctl.conf<\/p>\n\n\n\n<p>Uncomment (remove # at the start of the line) <\/p>\n\n\n\n<p>net.ipv4.ip_forward=1<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>check:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sysctl net.ipv4.ip_forward<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Symptioms:<\/p>\n\n\n\n<p>When IPv6 is DISabled on the local NIC but ENabled on the Tailscale NIC and 4to6 nat is disabled<\/p>\n\n\n\n<p>and the subnet has a combination of Tailscale subnet router AND hosts with the tailscale client installed<\/p>\n\n\n\n<p>tailscale routing gets confused<\/p>\n\n\n\n<p>Can&#8217;t ping some hosts, can&#8217;t get to shares using local IP address<\/p>\n\n\n\n<p>sometimes fixed by making sure tailscale is up on both ends<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you use Ubuntu as a tailscale router, IP Forwarding is turned off by default, you may get the misconfigured error message below Solution: nano \/etc\/sysctl.conf Uncomment (remove # at&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[205],"class_list":["post-4056","post","type-post","status-publish","format-standard","hentry","category-uncategorised","tag-tailscale"],"_links":{"self":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/4056","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4056"}],"version-history":[{"count":7,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/4056\/revisions"}],"predecessor-version":[{"id":4103,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/4056\/revisions\/4103"}],"wp:attachment":[{"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4056"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4056"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}