{"id":5937,"date":"2022-05-19T12:46:34","date_gmt":"2022-05-19T09:46:34","guid":{"rendered":"https:\/\/skeletor.org.ua\/?p=5937"},"modified":"2022-05-19T12:46:34","modified_gmt":"2022-05-19T09:46:34","slug":"linux-nat-over-pppoe","status":"publish","type":"post","link":"https:\/\/skeletor.org.ua\/?p=5937","title":{"rendered":"[Linux] NAT over PPPoE"},"content":{"rendered":"\n<p>\u0421\u0438\u043c\u043f\u0442\u043e\u043c\u044b: \u0447\u0430\u0441\u0442\u044c \u0441\u0430\u0439\u0442\u043e\u0432 \u043e\u0442\u043a\u0440\u044b\u0432\u0430\u0435\u0442\u0441\u044f, \u0447\u0430\u0441\u0442\u044c &#8211; \u043d\u0435\u0442. <strong>tcpdump<\/strong> \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442 \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u043e\u0431\u0435 \u0441\u0442\u043e\u0440\u043e\u043d\u044b. \u0412\u0441\u0435\u043c\u0443 \u0432\u0438\u043d\u043e\u0439 <strong>PPPoE<\/strong> \u0441 \u0435\u0433\u043e <strong>overhead&#8217;\u043e\u043c<\/strong> \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u043f\u0430\u043a\u0435\u0442\u0430.<\/p>\n\n\n<p>\u0420\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0435:<br \/><code><br \/>\niptables -I FORWARD 1 -p tcp --tcp-flags SYN,RST <strong>SYN<\/strong> -j TCPMSS --clamp-mss-to-pmtu<br \/>\n<\/code><br \/>\u041d\u043e \u0447\u0442\u043e \u043e\u043d\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442? \u041e\u043d\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442 &#8220;\u043d\u043e\u0440\u043c\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0430\u043a\u0435\u0442&#8221; \u0441\u043e\u0433\u043b\u0430\u0441\u043d\u043e <strong>PMTU<\/strong>, \u0442\u043e \u0435\u0441\u0442\u044c, \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 <strong>MSS<\/strong> \u0442\u0430\u043a, \u0447\u0442\u043e \u0431\u044b \u043f\u0430\u043a\u0435\u0442 \u043f\u0440\u043e\u0448\u0451\u043b \u043e\u0442 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0430 \u043a \u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044e, \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u0432\u044b\u0431\u0440\u0430\u0432 \u043d\u0430\u0438\u043c\u0435\u043d\u044c\u0448\u0438\u0439 <strong>MTU<\/strong> \u0441\u0440\u0435\u0434\u0438 \u0432\u0441\u0435\u0445 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0445.<\/p>\n<p>\u0412\u0430\u0436\u043d\u043e! \u041f\u0440\u0430\u0432\u0438\u043b\u043e \u043d\u0443\u0436\u043d\u043e \u0440\u0430\u0437\u043c\u0435\u0449\u0430\u0442\u044c \u0432 \u0441\u0430\u043c\u043e\u043c \u043d\u0430\u0447\u0430\u043b\u0435.<\/p>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0421\u0438\u043c\u043f\u0442\u043e\u043c\u044b: \u0447\u0430\u0441\u0442\u044c \u0441\u0430\u0439\u0442\u043e\u0432 \u043e\u0442\u043a\u0440\u044b\u0432\u0430\u0435\u0442\u0441\u044f, \u0447\u0430\u0441\u0442\u044c &#8211; \u043d\u0435\u0442. tcpdump \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442 \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0432 \u043e\u0431\u0435 \u0441\u0442\u043e\u0440\u043e\u043d\u044b. \u0412\u0441\u0435\u043c\u0443 \u0432\u0438\u043d\u043e\u0439 PPPoE \u0441 \u0435\u0433\u043e overhead&#8217;\u043e\u043c \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u043f\u0430\u043a\u0435\u0442\u0430. \u0420\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0435: iptables -I FORWARD 1 -p tcp &#8211;tcp-flags SYN,RST SYN -j TCPMSS &#8211;clamp-mss-to-pmtu \u041d\u043e \u0447\u0442\u043e \u043e\u043d\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442? \u041e\u043d\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442 &#8220;\u043d\u043e\u0440\u043c\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u0430\u043a\u0435\u0442&#8221; \u0441\u043e\u0433\u043b\u0430\u0441\u043d\u043e PMTU, \u0442\u043e \u0435\u0441\u0442\u044c, \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 MSS \u0442\u0430\u043a, \u0447\u0442\u043e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-5937","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/posts\/5937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5937"}],"version-history":[{"count":1,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/posts\/5937\/revisions"}],"predecessor-version":[{"id":5938,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=\/wp\/v2\/posts\/5937\/revisions\/5938"}],"wp:attachment":[{"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/skeletor.org.ua\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}