{"id":34402,"date":"2019-10-31T21:58:08","date_gmt":"2019-10-31T18:58:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/osobennosti-nastrojki-dpi\/"},"modified":"2019-10-31T21:58:08","modified_gmt":"2019-10-31T18:58:08","slug":"osobennosti-nastrojki-dpi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/news\/osobennosti-nastrojki-dpi","title":{"rendered":"Zna\u010dilnosti nastavitve DPI","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ta \u010dlanek ne obravnava popolne nastavitve DPI in vsega, kar s tem povezano, znanstvena vrednost besedila pa je minimalna. V njem pa je opisana najpreprostej\u0161a metoda obvoda DPI, ki je ni upo\u0161tevalo veliko podjetij.<\/p>\n<p><img decoding=\"async\" alt=\"Zna\u010dilnosti nastavitve DPI\" src=\"\/wp-content\/uploads\/2019\/05\/5fbb9d8c80da69f6d0058871953a095f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Opozorilo \u0161t. 1: ta \u010dlanek je raziskovalne narave, ne spodbuja nikogar, da karkoli stori ali uporablja. Ideja temelji na osebni izku\u0161nji, vsa morebitna naklju\u010dja so naklju\u010dna.<\/i><\/p>\n<p><i>Opozorilo \u0161t. 2: v \u010dlanku ne razkrivamo skrivnosti Atlantide, iskanja Svetega Grala in drugih ugank vesolja, ves material je dostopen in je morda bil ve\u010dkrat opisan na Habu. (nisem na\u0161el, bil bi hvale\u017een za povezavo)<\/i><\/p>\n<p>Za tiste, ki so prebrali opozorila, za\u010dnimo.<\/p>\n<h3>Kaj je DPI?<\/h3>\n<p>\nDPI ali Deep Packet Inspection je tehnologija zbiranja statisti\u010dnih podatkov, preverjanja in filtriranja omre\u017enih paketov z analizo ne le naslovov paketov, temve\u010d tudi celotne vsebine prometa na ravneh OSI modela od drugega in naprej, kar omogo\u010da odkrivanje in blokiranje virusov ter filtriranje informacij, ki ne ustrezajo dolo\u010denim kriterijem.<\/p>\n<p>Obstajata dva tipa povezave DPI, ki sta opisana <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/valdikss\/\" class=\"user_link\">ValdikSS<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ValdikSS\/blockcheck\/wiki\/%D0%A2%D0%B8%D0%BF%D1%8B-DPI\">pe github<\/a><\/noindex>:<\/p>\n<blockquote><p><b>Pasivni DPI <\/b><\/p>\n<p>DPI, ki je povezan v omre\u017eje ponudnika hkrati (ne prek) bodisi preko pasivnega opti\u010dnega razdelilnika bodisi z uporabo ogledovanja odhodnega prometa uporabnikov. Tak\u0161na povezava ne upo\u010dasnjuje hitrosti omre\u017eja ponudnika v primeru nezadostne zmogljivosti DPI, zaradi \u010desar se uporablja pri ve\u010djih ponudnikih. DPI s to vrsto povezave lahko tehni\u010dno le ugotovi poskus zahtevka za prepovedano vsebino, vendar je ne more prepre\u010diti. Da obide to omejitev in blokira dostop do prepovedane spletne strani, DPI po\u0161lje uporabniku, ki zahteva blokiran URL, posebno oblikovan HTTP paket s preusmeritvijo na stran-uzurpacijo ponudnika, kot da je tak odgovor poslala zahteva spletne strani (posnema se IP-naslov po\u0161iljatelja in TCP zaporedje). Zaradi tega, ker je DPI fizi\u010dno bli\u017eje uporabniku kot zahtevana spletna stran, potuje ponarejeni odgovor do uporabnikove naprave hitreje kot pravi odgovor s spletne strani.<\/p>\n<p><b>Aktivni DPI<\/b><\/p>\n<p>Aktivni DPI je DPI koji je povezan na mre\u017eu provajdera na uobi\u010dajen na\u010din, kao i bilo koji drugi mre\u017eni ure\u0111aj. Provajder konfiguri\u0161e rutiranje tako da DPI prima saobra\u0107aj od korisnika prema blokiranim IP adresama ili domenima, a DPI potom donosi odluku o prolasku ili blokiranju saobra\u0107aja. Aktivni DPI mo\u017ee proveravati izlazni i ulazni saobra\u0107aj, me\u0111utim, ako provajder koristi DPI samo za blokiranje sajtova iz registra, \u010de\u0161\u0107e se konfiguri\u0161e da proverava samo izlazni saobra\u0107aj.<\/p><\/blockquote>\n<p>\nTip veze ne uti\u010de samo na efikasnost blokiranja saobra\u0107aja, ve\u0107 i na optere\u0107enje na DPI, pa postoji mogu\u0107nost da se ne proverava sav saobra\u0107aj, ve\u0107 samo odre\u0111eni:<\/p>\n<blockquote><p><b>\u00abObi\u010dan\u00bb DPI<\/b><\/p>\n<p>Pod \u00abobi\u010dnim\u00bb DPI se podrazumeva DPI koji filtrira odre\u0111eni tip saobra\u0107aja samo na naj\u010de\u0161\u0107im portovima za taj tip. Na primer, \u00abobi\u010dan\u00bb DPI identifikuje i blokira zabranjeni HTTP saobra\u0107aj samo na portu 80, HTTPS saobra\u0107aj na portu 443. Ovaj tip DPI ne\u0107e pratiti zabranjeni sadr\u017eaj ako po\u0161aljete zahtev sa blokiranim URL-om na neblokirani IP ili nestandardni port.<\/p>\n<p><b>\u00abPotpuni\u00bb DPI<\/b><\/p>\n<p>Za razliku od \u00abobi\u010dnog\u00bb DPI, ovaj tip DPI klasifikuje saobra\u0107aj nezavisno od IP adrese i porta. Tako \u0107e zabranjeni sajtovi biti nedostupni, \u010dak i ako koristite proxy server na potpuno drugom portu i neblokiranoj IP adresi.<\/p><\/blockquote>\n<p><\/p>\n<h3>Upotreba DPI<\/h3>\n<p>\nDa se ne bi smanjila brzina prenosa podataka, potrebno je koristiti \u00abObi\u010dni\u00bb pasivni DPI, koji efikasno blokira bilo koji resurs. Po defaultu, konfiguracija izgleda ovako:<\/p>\n<ul>\n<li>HTTP filtrirati samo na portu 80<\/li>\n<li>HTTPS samo na portu 443<\/li>\n<li>BitTorrent samo na portovima 6881-6889<\/li>\n<\/ul>\n<p>\nAli problemi zapo\u010dinju kada <b>resurs koristi drugi port, kako bi zadr\u017eao korisnike<\/b>, tada \u0107e biti potrebno proveriti svaki paket, za primer mo\u017eemo navesti:<\/p>\n<ul>\n<li>HTTP funkcioni\u0161e na portovima 80 i 8080<\/li>\n<li>HTTPS na portovima 443 i 8443<\/li>\n<li>BitTorrent na bilo kojem drugom opsegu<\/li>\n<\/ul>\n<p>\nZbog toga \u0107e biti potrebno ili pre\u0107i na \u00abAktivni\u00bb DPI ili koristiti blokiranje putem dodatnog DNS servera.<\/p>\n<h3>Blokiranje putem DNS-a<\/h3>\n<p>\nEden od na\u010dinov za blokiranje dostopa do vira je zajem DNS poizvedb z lokalnim DNS stre\u017enikom in vra\u010danje IP naslova \"zastavice\" namesto zahtevane vsebine. Vendar to ne prina\u0161a zagotovljenega rezultata, saj obstaja mo\u017enost prepre\u010ditve zamenjave naslova:<\/p>\n<p><b>Mo\u017enost 1: Ureditev datoteke hosts (za namizje)<\/b><\/p>\n<p>Datoteka hosts je sestavni del vsakr\u0161nega operacijskega sistema, kar omogo\u010da njeno uporabo. Za dostop do vira mora uporabnik:<\/p>\n<ol>\n<li>Ugotoviti IP naslov zahtevanega vira<\/li>\n<li>Odpreti za urejanje datoteko hosts (potrebna so administratorska dovoljenja), ki se nahaja v:\n<ul>\n<li>Linux: \/etc\/hosts<\/li>\n<li>Windows: %WinDir%System32driversetchosts<\/li>\n<\/ul>\n<\/li>\n<li>Dodati vrstico v formatu:<\/li>\n<li>Shrani spremembe<\/li>\n<\/ol>\n<p>\nPrednost te metode je njena kompleksnost in zahteva administratorska dovoljenja.<\/p>\n<p><b>Mo\u017enost 2: DoH (DNS preko HTTPS) ali DoT (DNS preko TLS)<\/b><\/p>\n<p>Ti na\u010dini omogo\u010dajo za\u0161\u010dito pred zamenjavo DNS poizvedb s \u0161ifriranjem, vendar jih ne podpirajo vse aplikacije. Poglejmo enostavnost nastavitve DoH za Mozilla Firefox razli\u010dico 66 s strani uporabnika:<\/p>\n<ol>\n<li>Pojdi na naslov <noindex><a rel=\"nofollow\" href=\"http:\/\/about:config\">about:config<\/a><\/noindex> v Firefoxu<\/li>\n<li>Potrdite, da uporabnik prevzema vso tveganje<\/li>\n<li>Spremenite vrednost parametra <b>network.trr.mode<\/b> na:\n<ul>\n<li>0 \u2014 onemogo\u010di TRR<\/li>\n<li>1 \u2014 samodejna izbira<\/li>\n<li>2 \u2014 omogo\u010di DoH privzeto<\/li>\n<\/ul>\n<\/li>\n<li>Spremeni parameter <b>network.trr.uri<\/b> izbira DNS stre\u017enika\n<ul>\n<li>Cloudflare DNS: <noindex>mozilla.cloudflare-dns.com\/dns-query<\/noindex><\/li>\n<li>Google DNS: <noindex>dns.google.com\/experimental<\/noindex><\/li>\n<\/ul>\n<\/li>\n<li>Spremeni parameter <b>network.trr.boostrapAddress<\/b> na:\n<ul>\n<li>\u010ce je izbran Cloudflare DNS: 1.1.1.1<\/li>\n<li>\u010ce je izbran Google DNS: 8.8.8.8<\/li>\n<\/ul>\n<\/li>\n<li>Spremenite vrednost parametra <b>network.security.esni.enabled<\/b> na <b>true<\/b><\/li>\n<li>Preverite pravilnost nastavitve s pomo\u010djo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.cloudflare.com\/ssl\/encrypted-sni\/\">storitve Cloudflare<\/a><\/noindex><\/li>\n<\/ol>\n<p>\n\u010ceprav je ta na\u010din bolj zapleten, ne zahteva administratorskih dovoljenj uporabnika, poleg tega pa obstaja \u0161e veliko drugih na\u010dinov za\u0161\u010dite DNS poizvedb, ki niso opisani v tem \u010dlanku.<\/p>\n<p><b>Mo\u017enost 3 (za mobilne naprave):<\/b> <\/p>\n<p>Uporaba aplikacije Cloudflare za <noindex><a rel=\"nofollow\" href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.cloudflare.onedotonedotonedotone\">Android<\/a><\/noindex> in <noindex><a rel=\"nofollow\" href=\"https:\/\/itunes.apple.com\/us\/app\/1-1-1-1-faster-internet\/id1423538627?mt=8\">IOS<\/a><\/noindex>.<\/p>\n<h3>Testiranje<\/h3>\n<p>\nZa preverjanje, da ni dostopa do virov, je bil za\u010dasno kupljen domenski naslov, ki je bil blokiran na ozemlju RF:<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/1winu.xyz:80\">Preverjanje HTTP + 80 port<\/a><\/noindex><\/li>\n<li><noindex>Preverjanje HTTP + 8080 port<\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/1winu.xyz:443\">Preverjanje HTTPS + 443 port<\/a><\/noindex><\/li>\n<li><noindex>Preverjanje HTTPS + 8443 port<\/noindex><\/li>\n<\/ul>\n<p><\/p>\n<h3>Zaklju\u010dek<\/h3>\n<p>\nUpam, da bo ta \u010dlanek koristen in ne le motiviral skrbnike, da se bolj poglobijo v to temo, temve\u010d tudi pomagal razumeti, da <b>vsi viri bodo vedno na strani uporabnika in iskanje novih re\u0161itev bi moralo biti zanje nepogre\u0161ljivo.<\/b><\/p>\n<h4>Koristne poveznice<\/h4>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/globalsign\/blog\/427563\/\">Implementacija standarda Encrypted SNI u Firefoxu<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/335436\/\">Autonomni na\u010din zaobila\u017eenja DPI-a<\/a><\/noindex><\/li>\n<\/ul>\n<p>\n<b class=\"spoiler_title\">Dodatak van \u010dlanka<\/b>Test na Cloudflare se ne mo\u017ee savladati u mre\u017ei operatera Tele2, a pravilno pode\u0161en DPI blokira pristup testnoj platformi. <br \/>\nP.S. Ovo je prvi provajder koji ispravno blokira resurse.<\/p>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/453260\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043d\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u043b\u043d\u0430\u044f \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430 DPI \u0438 \u0432\u0441\u0435 \u0432\u043c\u0435\u0441\u0442\u0435 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0435, \u0430 \u043d\u0430\u0443\u0447\u043d\u0430\u044f \u0446\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u0442\u0435\u043a\u0441\u0442\u0430 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u0430. \u041d\u043e \u0432 \u043d\u0435\u0439 \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043e\u0431\u0445\u043e\u0434\u0430 DPI, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043d\u0435 \u0443\u0447\u043b\u0438 \u043c\u043d\u043e\u0433\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u21161: \u0434\u0430\u043d\u043d\u0430\u044f \u0441\u0442\u0430\u0442\u044c\u044f \u043d\u0435\u0441\u0435\u0442 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440, \u043d\u0435 \u043f\u043e\u0431\u0443\u0436\u0434\u0430\u0435\u0442 \u043d\u0438\u043a\u043e\u0433\u043e \u0447\u0442\u043e-\u043b\u0438\u0431\u043e \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c. \u0418\u0434\u0435\u044f \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043b\u0438\u0447\u043d\u043e\u043c \u043e\u043f\u044b\u0442\u0435, \u0430 \u043b\u044e\u0431\u044b\u0435 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b. \u041f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0435 \u21162: [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043d\u0435 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