{"id":7334,"date":"2022-04-19T15:52:50","date_gmt":"2022-04-19T12:52:50","guid":{"rendered":"https:\/\/vasexperts.com\/?p=7334"},"modified":"2025-08-13T14:19:00","modified_gmt":"2025-08-13T11:19:00","slug":"study-pptp-connection-test","status":"publish","type":"post","link":"https:\/\/vasexperts.com\/br\/blog\/telecom\/study-pptp-connection-test\/","title":{"rendered":"Estudo &#8211; Teste de conex\u00e3o PPTP"},"content":{"rendered":"<h2>Objetivos do estudo<\/h2>\r\n<ol>\r\n \t<li>Implementar um servidor PPTP e um cliente PPTP em diferentes cont\u00eaineres docker em interfaces virtuais (veth), simulando assim uma conex\u00e3o PPTP real no mesmo host. O diagrama de conex\u00e3o \u00e9 mostrado na Figura 1.<\/li>\r\n \t<li>Implemente uma conex\u00e3o nas interfaces f\u00edsicas da placa testada. O diagrama de conex\u00e3o \u00e9 mostrado na Figura 2.<\/li>\r\n \t<li>Obtenha para cada m\u00e9todo uma conex\u00e3o PCAP e compare os resultados.<\/li>\r\n<\/ol>\r\n\u00a0\r\n<div class=\"table\">\r\n<div class=\"table__body\">\r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">Especifica\u00e7\u00f5es do suporte de teste    <\/div>  \r\n<div class=\"table__cell table__cell--2\">    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">CPU    <\/div>  \r\n<div class=\"table__cell table__cell--2\">Intel(R) Xeon(R) CPU E3-1240 V2 @ 3.40GHz    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">Memory    <\/div>  \r\n<div class=\"table__cell table__cell--2\">Total 16GiB @ 1600MHz    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">NIC    <\/div>  \r\n<div class=\"table__cell table__cell--2\">Controlador Ethernet E810-C QSFP 100GbE de porta dupla    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">Operating System    <\/div>  \r\n<div class=\"table__cell table__cell--2\">Linux CentOS    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">Vers\u00e3o do kernel do Linux    <\/div>  \r\n<div class=\"table__cell table__cell--2\">4.18.0-348.el8.x86_64    <\/div>  \r\n    <\/div>  \r\n<div class=\"table__row\">\r\n<div class=\"table__cell table__cell--2\">Driver    <\/div>  \r\n<div class=\"table__cell table__cell--2\">ice 0.8.2-k    <\/div>  \r\n    <\/div>  \r\n    <\/div>  \r\n    <\/div>  \r\n\u00a0\r\n\r\n<h2>Implementa\u00e7\u00e3o<\/h2>\r\n<noscript><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-1024x370.png\" alt=\"virtual testing\" width=\"100%\" height=\"auto\" class=\"alignnone size-large wp-image-7354\" srcset=\"\/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-1024x370.png 1024w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-300x108.png 300w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-768x278.png 768w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1.png 1140w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/noscript><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-1024x370.png\" alt=\"virtual testing\" width=\"100%\" height=\"auto\" class=\"alignnone size-large wp-image-7354 lazyload\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-src=\"\/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-1024x370.png\" data-srcset=\"\/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-1024x370.png 1024w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-300x108.png 300w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1-768x278.png 768w, \/wp-content\/uploads\/2022\/04\/virtual-testing-1140x412-1.png 1140w\">\r\n<p style=\"text-align: center;\">Fig.1. Esquema de teste em interfaces virtuais.<\/p>\r\n\r\n<noscript><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-1024x419.png\" alt=\"physical testing\" width=\"100%\" height=\"auto\" class=\"alignnone size-large wp-image-7356\" srcset=\"\/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-1024x419.png 1024w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-300x123.png 300w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-768x314.png 768w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1.png 1140w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><\/noscript><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-1024x419.png\" alt=\"physical testing\" width=\"100%\" height=\"auto\" class=\"alignnone size-large wp-image-7356 lazyload\" sizes=\"(max-width: 1024px) 100vw, 1024px\" data-src=\"\/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-1024x419.png\" data-srcset=\"\/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-1024x419.png 1024w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-300x123.png 300w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1-768x314.png 768w, \/wp-content\/uploads\/2022\/04\/physical-testing-1140x466-1.png 1140w\">\r\n<p style=\"text-align: center;\">Fig.2. Esquema de teste em interfaces f\u00edsicas.<\/p>\r\n\u00a0\r\n<h2>Resultados<\/h2>\r\n1. PCAP no lado do cliente no esquema de interfaces virtuais (pptp_w_veth.pcap):\r\n<pre>\"No.\", \"Time\", \"Source\", \"Destination\", \"Protocol\", \"Length\", \"Info\"\r\n\"1\", \"0.000000\", \"172.50.0.2\", \"172.40.0.2\", \"TCP\", \"74\", \"51246 > 1723 [SYN]\r\n\"2\", \"0.000028\", \"172.40.0.2\", \"172.50.0.2\", \"TCP\", \"74\", \"1723 > 51246 [SYN, ACK]\r\n\"3\", \"0.000040\", \"172.50.0.2\", \"172.40.0.2\", \"TCP\", \"66\", \"51246 > 1723 [ACK]\r\n\"4\",\"0.000205\",\"172.50.0.2\",\"172.40.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Request\"\r\n\"5\", \"0.000214\", \"172.40.0.2\", \"172.50.0.2\", \"TCP\", \"66\", \"1723 > 51246 [ACK]\r\n\"6\",\"0.000911\",\"172.40.0.2\",\"172.50.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Reply\"\r\n\"7\", \"0.000915\", \"172.50.0.2\", \"172.40.0.2\", \"TCP\", \"66\", \"51246 > 1723 [ACK]\r\n\"8\",\"1.000442\",\"172.50.0.2\",\"172.40.0.2\",\"PPTP\",\"234\",\"Outgoing-Call-Request\"\r\n\"9\",\"1.000970\",\"172.40.0.2\",\"172.50.0.2\",\"PPTP\",\"98\",\"Outgoing-Call-Reply\"\r\n\"10\", \"1.000979\", \"172.50.0.2\", \"172.40.0.2\", \"TCP\", \"66\", \"51246 > 1723 [ACK]\r\n\"11\",\"1.001157\",\"172.50.0.2\",\"172.40.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"12\",\"1.004528\",\"172.40.0.2\",\"172.50.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"13\",\"1.004620\",\"172.40.0.2\",\"172.50.0.2\",\"PPP LCP\",\"74\",\"Configuration Ack\"\r\n\"14\",\"1.004667\",\"172.50.0.2\",\"172.40.0.2\",\"PPP LCP\",\"74\",\"Configuration Ack\"\r\n\"15\",\"1.004724\",\"172.50.0.2\",\"172.40.0.2\",\"PPP IPCP\",\"64\",\"Configuration Request\"\r\n\"16\",\"1.004832\",\"172.40.0.2\",\"172.50.0.2\",\"PPP CCP\",\"64\",\"Configuration Request\"\r\n\"17\",\"1.004838\",\"172.40.0.2\",\"172.50.0.2\",\"PPP IPCP\",\"58\",\"Configuration Request\"\r\n\"18\",\"1.004864\",\"172.40.0.2\",\"172.50.0.2\",\"PPP IPCP\",\"58\",\"Configuration Reject\"\r\n\"19\",\"1.004908\",\"172.50.0.2\",\"172.40.0.2\",\"PPP CCP\",\"56\",\"Configuration Request\"\r\n\"20\",\"1.004920\",\"172.50.0.2\",\"172.40.0.2\",\"PPP CCP\",\"60\",\"Configuration Reject\"\r\n\"21\",\"1.004939\",\"172.50.0.2\",\"172.40.0.2\",\"PPP IPCP\",\"58\",\"Configuration Ack\"\r\n\"22\",\"1.004971\",\"172.50.0.2\",\"172.40.0.2\",\"PPP IPCP\",\"58\",\"Configuration Request\"\r\n\"23\",\"1.005033\",\"172.40.0.2\",\"172.50.0.2\",\"PPP CCP\",\"56\",\"Configuration Ack\"\r\n\"24\",\"1.005038\",\"172.40.0.2\",\"172.50.0.2\",\"PPP CCP\",\"56\",\"Configuration Request\"\r\n\"25\",\"1.005062\",\"172.40.0.2\",\"172.50.0.2\",\"PPP IPCP\",\"58\",\"Configuration Nak\"\r\n\"26\",\"1.005118\",\"172.50.0.2\",\"172.40.0.2\",\"PPP CCP\",\"56\",\"Configuration Ack\"\r\n\"27\",\"1.005148\",\"172.50.0.2\",\"172.40.0.2\",\"PPP IPCP\",\"58\",\"Configuration Request\"\r\n\"28\",\"1.005205\",\"172.40.0.2\",\"172.50.0.2\",\"PPP IPCP\",\"62\",\"Configuration Ack\"\r\n\"29\",\"1.505778\",\"172.50.0.2\",\"172.40.0.2\",\"GRE\",\"46\",\"Encapsulated PPP\"<\/pre>\r\n\r\n\r\n2.1 PCAP no lado do cliente no esquema de interfaces f\u00edsicas (pptp_w_810_client.pcap):\r\n<pre>\"No.\", \"Time\", \"Source\", \"Destination\", \"Protocol\", \"Length\", \"Info\"\r\n\"1\", \"0.000000\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"74\", \"33730 > 1723 [SYN]\r\n\"2\", \"0.000067\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"74\", \"1723 > 33730 [SYN, ACK]\r\n\"3\", \"0.000080\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"4\",\"0.000299\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Request\"\r\n\"5\", \"0.000324\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"66\", \"1723 > 33730 [ACK]\r\n\"6\",\"0.001052\",\"172.10.0.2\",\"172.30.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Reply\"\r\n\"7\", \"0.001058\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"8\",\"1.000567\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"234\",\"Outgoing-Call-Request\"\r\n\"9\",\"1.001172\",\"172.10.0.2\",\"172.30.0.2\",\"PPTP\",\"98\",\"Outgoing-Call-Reply\"\r\n\"10\", \"1.001192\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"11\",\"1.001354\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"12\",\"3.997954\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"13\",\"7.001009\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"14\",\"10.004123\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"15\",\"13.007221\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"16\",\"16.010336\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"17\",\"19.013400\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"18\",\"22.016486\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"19\",\"25.019571\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"20\",\"28.022668\",\"172.30.0.2\",\"172.10.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"21\",\"31.032879\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"82\",\"Call-Clear-Request\"\r\n\"22\", \"31.032941\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [FIN, ACK]\r\n\"23\", \"31.032999\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"66\", \"1723 > 33730 [FIN, ACK]\r\n\"24\", \"31.033008\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]<\/pre>\r\n\r\n\r\n2.2 PCAP no lado do servidor no esquema de interfaces f\u00edsicas (pptp_w_810_server.pcap):\r\n\r\n<pre>\"No.\", \"Time\", \"Source\", \"Destination\", \"Protocol\", \"Length\", \"Info\"\r\n\"1\", \"0.000000\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"74\", \"33730 > 1723 [SYN]\r\n\"2\", \"0.000026\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"74\", \"1723 > 33730 [SYN, ACK]\r\n\"3\", \"0.000069\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"4\",\"0.000290\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Request\"\r\n\"5\", \"0.000298\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"66\", \"1723 > 33730 [ACK]\r\n\"6\",\"0.001014\",\"172.10.0.2\",\"172.30.0.2\",\"PPTP\",\"222\",\"Start-Control-Connection-Reply\"\r\n\"7\", \"0.001047\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"8\",\"1.000598\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"234\",\"Outgoing-Call-Request\"\r\n\"9\",\"1.001134\",\"172.10.0.2\",\"172.30.0.2\",\"PPTP\",\"98\",\"Outgoing-Call-Reply\"\r\n\"10\", \"1.001189\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n\"11\",\"1.004629\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"12\",\"4.007764\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"13\",\"7.010842\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"14\",\"10.013949\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"15\",\"13.017035\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"16\",\"16.020115\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"17\",\"19.023193\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"18\",\"22.026271\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"19\",\"25.029348\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"20\",\"28.030753\",\"172.10.0.2\",\"172.30.0.2\",\"PPP LCP\",\"70\",\"Configuration Request\"\r\n\"21\",\"31.032901\",\"172.30.0.2\",\"172.10.0.2\",\"PPTP\",\"82\",\"Call-Clear-Request\"\r\n\"22\", \"31.032938\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [FIN, ACK]\r\n\"23\", \"31.032972\", \"172.10.0.2\", \"172.30.0.2\", \"TCP\", \"66\", \"1723 > 33730 [FIN, ACK]\r\n\"24\", \"31.032996\", \"172.30.0.2\", \"172.10.0.2\", \"TCP\", \"66\", \"33730 > 1723 [ACK]\r\n<\/pre>\r\n\r\n\r\n<h2>An\u00e1lise<\/h2>\r\nA partir do PCAP capturado no lado do cliente no esquema de interface virtual (pptp_w_veth.pcap), voc\u00ea pode ver que a conex\u00e3o PPTP foi bem-sucedida.\r\n\r\nOcorre um erro durante o processo de conex\u00e3o no momento da transmiss\u00e3o dos pacotes LCP que s\u00e3o encapsulados por GRE no esquema de interfaces f\u00edsicas (pptp_w_810_server\/client.pcap). O cliente e o servidor enviam um pacote LCP (Configure-Request), mas n\u00e3o os recebem.\r\n\r\n<h2>Conclus\u00e3o<\/h2>\r\nOs testes mostraram que a Intel Ethernet Card E810 100GbE n\u00e3o descarta os pacotes GRE ao tentar uma conex\u00e3o PPTP.\r\n\r\nAcreditamos que essas informa\u00e7\u00f5es ser\u00e3o \u00fateis para a comunidade de ISPs e o ajudar\u00e3o a escolher o equipamento de rede correto. Esperamos que a Intel preste aten\u00e7\u00e3o a esse problema, corrija-o e melhore a qualidade dos servi\u00e7os.\r\n\r\n\r\n<em>    <strong>   Authors of study:    <\/strong>  \r\nDmitry Moldavanov, CTO\r\nKirill Marchenko, engenheiro de rede<\/em>\r\n\r\n [subscription id=\u201d 11987\u2033]Assine nosso boletim informativo e fique atualizado sobre os \u00faltimos desenvolvimentos e ofertas especiais.","protected":false},"excerpt":{"rendered":"<p>Neste artigo, revelamos um processo passo a passo para testar uma conex\u00e3o PPTP em interfaces virtuais e f\u00edsicas usando uma placa de rede Intel Ethernet E810-C 100GbE.<\/p>\n","protected":false},"author":7,"featured_media":7380,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48],"tags":[],"class_list":["post-7334","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-telecom"],"yoast_head":"<!-- This site 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