{"id":124,"date":"2017-01-17T19:51:17","date_gmt":"2017-01-17T12:51:17","guid":{"rendered":"http:\/\/prosindo.com\/blog\/?p=124"},"modified":"2017-01-17T19:51:17","modified_gmt":"2017-01-17T12:51:17","slug":"how-to-enable-gre-in-openwrt-pptp-nat-traversal","status":"publish","type":"post","link":"https:\/\/prosindo.com\/blog\/2017\/01\/17\/how-to-enable-gre-in-openwrt-pptp-nat-traversal\/","title":{"rendered":"How to Enable GRE in OpenWRT (PPTP NAT Traversal)"},"content":{"rendered":"<p>PPTP utilizes the <a class=\"interwiki iw_wp\" title=\"https:\/\/en.wikipedia.org\/wiki\/Generic Routing Encapsulation\" href=\"https:\/\/en.wikipedia.org\/wiki\/Generic%20Routing%20Encapsulation\">GRE (Generic Routing Encapsulation)<\/a> protocol for its point-to-point tunnel. As a pure IP protocol GRE uses only IP addresses but no port numbers giving the router&#8217;s NAT a tough time to track such a connection. In its base configuration OpenWrt Backfire is able to NAT a single PPTP connections but not multiple such connections concurrently. It is also unreliable when trying to establish consecutive single PPTP connections from different <abbr title=\"Local Area Network\">LAN<\/abbr> clients in rapid succession. This limitation can be lifted (as far as I could make out so far) by installing the following package.<\/p>\n<p>Installation<\/p>\n<p>Requirements:<br \/>\n<code>kmod-ipt-nathelper-extra<\/code><\/p>\n<p>For the current versions of OpenWRT (since Chaos Calmer 15.05), you should install:<\/p>\n<pre class=\"code bash\">opkg <span class=\"kw2\">install<\/span> kmod-nf-nathelper-extra<\/pre>\n<p>You should now be able to use multiple PPTP connections from <abbr title=\"Local Area Network\">LAN<\/abbr> to WAN at the same time.<\/p>\n<p>Old versions until Barrier Breaker 14.07 used &#8216;kmod-ipt-nathelper-extra&#8217; instead:<\/p>\n<pre class=\"code bash\">opkg <span class=\"kw2\">install<\/span> kmod-ipt-nathelper-extra<\/pre>\n<p>&nbsp;<\/p>\n<p>Source:<br \/>\nhttps:\/\/wiki.openwrt.org\/doc\/howto\/vpn.nat.pptp<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PPTP utilizes the GRE (Generic Routing Encapsulation) protocol for its point-to-point tunnel. As a pure IP protocol GRE uses only IP addresses but no port numbers giving the router&#8217;s NAT a tough time to track such a connection. In its base configuration OpenWrt Backfire is able to NAT a single PPTP connections but not multiple &hellip; <a href=\"https:\/\/prosindo.com\/blog\/2017\/01\/17\/how-to-enable-gre-in-openwrt-pptp-nat-traversal\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;How to Enable GRE in OpenWRT (PPTP NAT Traversal)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-124","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/posts\/124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/comments?post=124"}],"version-history":[{"count":0,"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/posts\/124\/revisions"}],"wp:attachment":[{"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/media?parent=124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/categories?post=124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prosindo.com\/blog\/wp-json\/wp\/v2\/tags?post=124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}