{"id":11090,"date":"2020-06-11T20:32:35","date_gmt":"2020-06-11T18:32:35","guid":{"rendered":"https:\/\/wp.jochen.hayek.name\/blog-en\/?p=11090"},"modified":"2020-06-15T12:21:24","modified_gmt":"2020-06-15T10:21:24","slug":"fritz-box-vpn-ipv4","status":"publish","type":"post","link":"https:\/\/wp.jochen.hayek.name\/blog-en\/2020\/06\/11\/fritz-box-vpn-ipv4\/","title":{"rendered":"connecting to a FRITZ!Box via VPN \u00e0 la Cisco IPSec"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/service.avm.de\/help\/en\/FRITZ-Box-7590\/019\/hilfe_vpn_oeffentliche_ipv4_adresse\">https:\/\/service.avm.de\/help\/en\/FRITZ-Box-7590\/019\/hilfe_vpn_oeffentliche_ipv4_adresse<\/a> (in English)<\/li><li><a href=\"https:\/\/service.avm.de\/help\/de\/FRITZ-Box-Fon-WLAN-7490\/019\/hilfe_vpn_oeffentliche_ipv4_adresse\">https:\/\/service.avm.de\/help\/de\/FRITZ-Box-Fon-WLAN-7490\/019\/hilfe_vpn_oeffentliche_ipv4_adresse<\/a> (in German)<\/li><li><a href=\"https:\/\/en.avm.de\/service\/fritzbox\/fritzbox-7590\/knowledge-base\/publication\/show\/200_FRITZ-VPN-cannot-establish-a-VPN-connection-to-FRITZ-Box\/\">https:\/\/en.avm.de\/service\/fritzbox\/fritzbox-7590\/knowledge-base\/publication\/show\/200_FRITZ-VPN-cannot-establish-a-VPN-connection-to-FRITZ-Box\/<\/a> (in English)<\/li><li><a href=\"https:\/\/avm.de\/service\/fritzbox\/fritzbox-7360\/wissensdatenbank\/publication\/show\/200_FRITZ-Fernzugang-kann-keine-VPN-Verbindung-zur-FRITZ-Box-herstellen\/\">https:\/\/avm.de\/service\/fritzbox\/fritzbox-7360\/wissensdatenbank\/publication\/show\/200_FRITZ-Fernzugang-kann-keine-VPN-Verbindung-zur-FRITZ-Box-herstellen\/<\/a> (in German)<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/IPsec\">https:\/\/en.wikipedia.org\/wiki\/IPsec<\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fo connecting to a FRITZ!Box via VPN \u00e0 la Cisco IPsec the remote server (the FRITZ!Box) must have an IPv4 address (only) \u2013 if it also has an IPv6 address, connecting won&#8217;t work out. It took me quite some time this afternoon to figure this out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the DNS resolution also delivers an IPv6 address, that seems to confuse the VPN client.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2020-06-15 : &#8220;IPv6 + IPv4&#8221; (&#8220;Use native IPv6 connection&#8221; + &#8220;Establish IPv4 connection via DS Lite&#8221;) does not seem to be an obstacle defeating a VPN connection. I have no idea, why it did not work out before.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/service.avm.de\/help\/en\/FRITZ-Box-7590\/019\/hilfe_vpn_oeffentliche_ipv4_adresse (in English) https:\/\/service.avm.de\/help\/de\/FRITZ-Box-Fon-WLAN-7490\/019\/hilfe_vpn_oeffentliche_ipv4_adresse (in German) https:\/\/en.avm.de\/service\/fritzbox\/fritzbox-7590\/knowledge-base\/publication\/show\/200_FRITZ-VPN-cannot-establish-a-VPN-connection-to-FRITZ-Box\/ (in English) https:\/\/avm.de\/service\/fritzbox\/fritzbox-7360\/wissensdatenbank\/publication\/show\/200_FRITZ-Fernzugang-kann-keine-VPN-Verbindung-zur-FRITZ-Box-herstellen\/ (in German) https:\/\/en.wikipedia.org\/wiki\/IPsec Fo connecting to a FRITZ!Box via VPN \u00e0 la Cisco IPsec the remote server (the FRITZ!Box) must have an IPv4 address (only) \u2013 if it also has an IPv6 address, connecting won&#8217;t work out. It took me quite some time this afternoon [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_share_on_mastodon":"0"},"categories":[34,1457],"tags":[],"class_list":["post-11090","post","type-post","status-publish","format-standard","hentry","category-avm-fritz-box","category-vpn"],"share_on_mastodon":{"url":"","error":""},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paO0kP-2SS","jetpack_likes_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts\/11090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/comments?post=11090"}],"version-history":[{"count":3,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts\/11090\/revisions"}],"predecessor-version":[{"id":11093,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/posts\/11090\/revisions\/11093"}],"wp:attachment":[{"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/media?parent=11090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/categories?post=11090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.jochen.hayek.name\/blog-en\/wp-json\/wp\/v2\/tags?post=11090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}