{"id":284,"date":"2015-10-14T15:03:36","date_gmt":"2015-10-14T13:03:36","guid":{"rendered":"http:\/\/neuronetix.de\/?p=284"},"modified":"2019-02-25T19:51:49","modified_gmt":"2019-02-25T17:51:49","slug":"pptp-forwarding-fuer-nat-mit-iptables-unter-ubuntu","status":"publish","type":"post","link":"https:\/\/neuronetix.de\/?p=284","title":{"rendered":"PPTP Forwarding f\u00fcr NAT mit iptables unter Ubuntu"},"content":{"rendered":"<p>Damit ein PPTP Server hinter einer iptables Firewall mit NAT erreichbar ist braucht es folgende Regeln f\u00fcr die\u00a0iptables Firewall:<br \/>\nIm Beispiel ist eth0 das externe Interface und 192.168.200.1 die IPv4 Adresse des PPTP Servers.<br \/>\nPortforwarding:<\/p>\n<pre>iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 1723 -j DNAT --to-destination 192.168.200.1\niptables -t nat -A PREROUTING -i eth0 -p gre -j DNAT --to-destination 192.168.200.1<\/pre>\n<p>Zus\u00e4tzlich m\u00fcssen 2 Kernel Module geladen werden. Diese werden dazu in \/etc\/modules eingetragen<\/p>\n<pre>ip_conntrack_pptp\nip_nat_pptp<\/pre>\n<p>Anschlie\u00dfend ist der PPTP Server \u00fcber die IP Adresse des Interface eth0 erreichbar &#8211; Voraussetzung ist ein bereits funktionierendes Router Setup mit MASQUERADING und IP-Forwarding.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Damit ein PPTP Server hinter einer iptables Firewall mit NAT erreichbar ist braucht es folgende Regeln f\u00fcr die\u00a0iptables Firewall: Im Beispiel ist eth0 das externe Interface und 192.168.200.1 die IPv4 Adresse des PPTP Servers. Portforwarding: iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp &#8211;dport 1723 -j DNAT &#8211;to-destination 192.168.200.1 iptables -t nat [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/posts\/284"}],"collection":[{"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/neuronetix.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=284"}],"version-history":[{"count":2,"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/posts\/284\/revisions"}],"predecessor-version":[{"id":378,"href":"https:\/\/neuronetix.de\/index.php?rest_route=\/wp\/v2\/posts\/284\/revisions\/378"}],"wp:attachment":[{"href":"https:\/\/neuronetix.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/neuronetix.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/neuronetix.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}