{"id":30229,"date":"2019-10-31T21:34:23","date_gmt":"2019-10-31T18:34:23","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vpn-dlya-mobilnyh-ustrojstv-na-urovne-seti\/"},"modified":"2019-10-31T21:34:23","modified_gmt":"2019-10-31T18:34:23","slug":"vpn-dlya-mobilnyh-ustrojstv-na-urovne-seti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/vpn-dlya-mobilnyh-ustrojstv-na-urovne-seti","title":{"rendered":"VPN pentru dispozitive mobile la nivel de re\u021bea","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen spa\u021biul online din Rusia exist\u0103 \u00eenc\u0103 o surprinz\u0103toare lips\u0103 de materiale despre o tehnologie at\u00e2t de veche \u0219i simpl\u0103, dar util\u0103, sigur\u0103 \u0219i deosebit de relevant\u0103 \u00een contextul dezvolt\u0103rii Internetului Lucrurilor, cum ar fi VPN-ul mobil (re\u021bea privat\u0103 virtual\u0103). \u00cen acest articol, voi descrie cum \u0219i de ce po\u021bi configura accesul la re\u021beaua ta privat\u0103 de pe orice dispozitiv cu cartela SIM, f\u0103r\u0103 a necesita instalarea de software specializat.<br \/>\n<img decoding=\"async\" alt=\"VPN pentru dispozitive mobile la nivel de re\u021bea\" src=\"\/wp-content\/uploads\/2019\/03\/db21fb373995e9f0f89c33e98e8844c4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Sarcini \u0219i limit\u0103ri<\/h2>\n<p>\nMai \u00eent\u00e2i, voi r\u0103spunde la \u00eentrebarea \u201ede ce?\u201d. VPN-ul ca tehnologie este folosit pentru a rezolva cele mai diverse sarcini de re\u021bea, toate unite prin caracteristica comun\u0103 de transmitere izolat\u0103 a datelor \u00eentre dou\u0103 dispozitive printr-un num\u0103r mare de noduri intermediare. Pe baza acestei caracteristici se construiesc solu\u021bii mai complexe \u0219i se rezolv\u0103 acele multe sarcini. \u00cen cazul obi\u0219nuit, cunoscut de toat\u0103 lumea, pentru a construi un VPN se folose\u0219te re\u021beaua operatorului de telecomunica\u021bii fixe (cei interesa\u021bi de detalii au <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/273679\/\">un material excelent<\/a><\/noindex>) sau o varietate de protocoale de re\u021bea (GRE, IPSec, L2TP \u0219i altele \u2013 acela\u0219i autor <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/170895\/\">despre acest subiect<\/a><\/noindex>) \u0219i produsele software care lucreaz\u0103 cu acestea (Cisco AnyConnect, OpenVPN, TOR \u2013 \u0219i voi \u0219ti\u021bi bine), dar utilizarea lor pe un dispozitiv final specific impune imediat o serie de cerin\u021be, ne\u00eendeplinirea c\u0103rora duce la anumite limit\u0103ri.<\/p>\n<p>Prima limitare serioas\u0103 este c\u0103 dispozitivul trebuie s\u0103 fie capabil, la nivel hardware \u0219i software, s\u0103 lucreze m\u0103car cu unul dintre aceste protocoale. Cel mai adesea, aceasta depinde de software, care este u\u0219or de g\u0103sit pentru laptopuri sau smartphone-uri, dar exist\u0103 cazuri \u00een care sarcina apare \u00een fa\u021ba unui dispozitiv prea simplu din punct de vedere hardware sau software-ul acestuia are limit\u0103ri: un contor de ap\u0103 vrea s\u0103 utilizeze VPN pentru a transmite micu\u021bul s\u0103u byte de date o dat\u0103 pe lun\u0103, la fel cum tu dore\u0219ti s\u0103 folose\u0219ti VPN pentru a-\u021bi edita profilul LinkedIn.<\/p>\n<p>O alt\u0103 limitare important\u0103 este necesitatea configur\u0103rii. Aceasta func\u021bioneaz\u0103 at\u00e2t pentru dispozitivele \u201esimple\u201d men\u021bionate \u00een primul punct, c\u00e2t \u0219i pentru smartphone-uri \u0219i calculatoare clasice, care nu sunt con\u0219tiente de limita anterioar\u0103. Iar pentru primele, totul este relativ simplu \u0219i depinde de timpul necesar pentru configurare, dar pentru celelalte exist\u0103 variante. Adesea, organiza\u021biile folosesc VPN-uri din motive de siguran\u021b\u0103 pentru a proteja dispozitivele terminale de accesul la re\u021beaua public\u0103 f\u0103r\u0103 o protec\u021bie corporativ\u0103 adecvat\u0103 sau de transmiterea datelor de serviciu prin canale publice. Utilizatorii finali pot, din diverse motive, s\u0103 dezactiveze sau s\u0103 uite s\u0103 activeze VPN-ul, ceea ce poate l\u0103sa multe sisteme de securitate ale companiei \u201e\u00een afara\u201d,<\/p>\n<p>Ambele aceste limit\u0103ri sunt u\u0219or de eliminat dac\u0103 accesul la VPN este asigurat la nivel de re\u021bea. \u00cen cazul re\u021belelor mobile, aceasta poate fi realizat\u0103 printr-un \u201eVPN mobil\u201d. Un dispozitiv, indiferent de complexitate, capabil s\u0103 transmit\u0103 date, le va transmite c\u0103tre re\u021beaua corect\u0103. Nu conteaz\u0103 ce set\u0103ri sunt realizate pe dispozitiv, dac\u0103 re\u021beaua este configurat\u0103 corect, va transmite tot timpul \u00een locul dorit \u0219i nic\u0103ieri altundeva. <\/p>\n<p>\u0218i ca un bonus pl\u0103cut, dispozitivul va primi o adres\u0103 din re\u021beaua intern\u0103, configurabil\u0103 de la distan\u021b\u0103, iar accesul la acesta va fi posibil doar din interiorul acestei re\u021bele (sau fizic). Pentru un anumit tip de dispozitive, acest lucru este foarte important.<\/p>\n<h2>Cum func\u021bioneaz\u0103<\/h2>\n<p><\/p>\n<h3>PS Core<\/h3>\n<p>\nAr p\u0103rea c\u0103 VPN-ul este un serviciu clasic oferit de to\u021bi operatorii de telecomunica\u021bii pentru segmentul B2B, \u0219i de ce ar trebui s\u0103 ne concentr\u0103m at\u00e2t de mult pe acest aspect? Totul se reduce la modul \u00een care este conceput\u0103 re\u021beaua de transmitere a datelor pentru dispozitivele conectate prin GPRS, HSPA, LTE sau alte tehnologii de comunica\u021bie mobil\u0103. Aici nu exist\u0103 VLAN-uri cunoscute de to\u021bi administratorii de re\u021bea, nu exist\u0103 comutatoare, nu exist\u0103 chiar \u0219i routere \u00een sensul obi\u0219nuit. \u00cen schimb, exist\u0103 o re\u021bea de acces radio (RAN) \u0219i un nucleu de pachete (PS Core). <\/p>\n<p><img decoding=\"async\" alt=\"VPN pentru dispozitive mobile la nivel de re\u021bea\" src=\"\/wp-content\/uploads\/2019\/03\/2f8f98c154a240d21db99c9b6b1b2cfc.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Schema simplificat\u0103 a re\u021belei de pachete a operatorului de telecomunica\u021bii mobile. Aceasta difer\u0103 pu\u021bin pentru LTE, dar sensul general r\u0103m\u00e2ne acela\u0219i.<\/i><\/p>\n<p>\u00cen general, fiecare dispozitiv cu SIM, \u00eenregistrat \u00een re\u021beaua de pachete (care a trecut prin procedura de ata\u0219are GPRS sau similar\u0103), \u00eenainte de a \u00eencepe s\u0103 transfere date, trebuie s\u0103 ini\u021bieze crearea unei sesiuni de transfer de date (context PDP) pe routerul nucleului re\u021belei de pachete, GGSN. Detalii \u0219i scopul acestor procese sunt foarte bine descrise aici <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/81385\/\">aceast\u0103 articole<\/a><\/noindex>. Ce este important pentru noi: la ini\u021bierea sesiunii, \u00een cererea c\u0103tre GGSN, printre altele se reg\u0103sesc parametrii pe care mul\u021bi i-au v\u0103zut \u00een telefoanele lor sau chiar s-au confruntat cu ei la configurarea, de exemplu, a modemurilor USB. Acestea sunt trei c\u00e2mpuri: APN, nume de utilizator \u0219i parol\u0103. APN (punct de acces) este o entitate foarte important\u0103 \u00een logica func\u021bion\u0103rii GGSN: \u00een func\u021bie de APN cu care este ini\u021biat\u0103 sesiunea, GGSN ac\u021bioneaz\u0103 diferit. Ca urmare a proces\u0103rii cu succes a cererii utilizatorului, GGSN trebuie s\u0103 activeze o sesiune de transfer de date \u0219i s\u0103 comunice dispozitivului parametrii acesteia, \u00een special, adresa IP acordat\u0103 dispozitivului \u0219i adresele DNS. Aici exist\u0103 o serie de caracteristici foarte importante:<\/p>\n<ul>\n<li>\u00cen cererea pentru ini\u021bierea unei sesiuni, dispozitivul nu solicit\u0103 niciodat\u0103 ce adres\u0103 IP ar dori s\u0103 primeasc\u0103;<\/li>\n<li>Pe l\u00e2ng\u0103 c\u00e2mpurile \u00abAPN\u00bb, \u00abnume de utilizator\u00bb \u0219i \u00abparol\u0103\u00bb stabilite \u00een set\u0103rile dispozitivului, \u00een cererea c\u0103tre GGSN este transmis \u0219i num\u0103rul de telefon (MSISDN) al abonatului (aici \u0219i mai departe, \u00ababonat\u00bb se refer\u0103 la utilizatorul final, un dispozitiv cu SIM, iar \u00abclient\u00bb este organiza\u021bia care solicit\u0103 serviciul, din care fac parte abona\u021bii);<\/li>\n<li>La activarea sesiunii, GGSN creeaz\u0103 \u00een tabela sa de rutare o \u00eenregistrare a noii adrese IP. To\u021bi abona\u021bii de la GGSN sunt desemna\u021bi prin \u00eenregistr\u0103ri \u00een tabela de rutare cu prefixul \/32, adic\u0103 1 abonat \u2014 1 \u00eenregistrare \u00een tabel. GGSN este un router foarte performant;<\/li>\n<li>Re\u021beaua operatorului poate schimba, \u00een diferite etape (\u0219i la SGSN, \u0219i la GGSN), din diverse motive, c\u00e2mpul APN din cererea pentru ini\u021bierea sesiunii. Acest lucru permite, \u00een anumite cazuri, reducerea, iar \u00een altele, chiar eliminarea necesit\u0103\u021bii de configurare a parametrilor re\u021belei pe dispozitivele cu SIM.<\/li>\n<\/ul>\n<p>\nReferitor la primele trei puncte, imediat apare \u00eentrebarea: ce adres\u0103 IP este acordat\u0103 abonatului? <br \/>\nAceasta este determinat\u0103 de set\u0103rile APN-ului prin care a venit solicitarea de activare a sesiunii. Aproximativ 99% dintre utilizatorii de date \u00een re\u021bele mobile folosesc acces obi\u0219nuit la Internet. Acestea sunt cunoscutele puncte de acces internet.mts.ru, internet.beeline.ru \u0219i a\u0219a mai departe. \u00cen cazul accesului la Internet, GGSN-ul furnizeaz\u0103 adrese pe principiul DHCP-ului clasic din subre\u021belele gri specificate \u00een set\u0103ri. La ie\u0219irea \u00een re\u021beaua public\u0103, acestea sunt \u00eenchise prin NAT clasic (sau mai precis, prin versiunea sa PAT).<\/p>\n<p>Dar GGSN-ul poate face mai mult. Pentru a selecta o adres\u0103 IP, acesta poate efectua o cerere AAA c\u0103tre serverul de autorizare (de exemplu, Radius). Aceast\u0103 logic\u0103 este configurat\u0103 pentru APN-uri separate, \u00een func\u021bie de destina\u021bia lor. Cel mai simplu caz este serviciul de furnizare a unei adrese IP publice permanente. Astfel de adrese sunt, de obicei, alocate abona\u021bilor \u00een sistemul de facturare (BSS) al operatorului \u0219i, \u00een func\u021bie de arhitectura IT, ajung \u00een una sau alta dintre bazele de date, la care GGSN-ul se adreseaz\u0103 cu solicitarea. Datorit\u0103 faptului c\u0103 \u00eei este cunoscut MSISDN-ul (num\u0103rul de telefon) al abonatului, care va fi inclus \u00een cerere, aceast\u0103 baz\u0103 de date poate fi destul de simpl\u0103 \u0219i poate con\u021bine doar asocia\u021bia num\u0103r-adres\u0103. \u00cen plus, \u00een cazul \u00een care clientul inten\u021bioneaz\u0103 s\u0103 foloseasc\u0103 un singur card SIM pentru a conecta mai multe dispozitive (dac\u0103 cardul SIM se afl\u0103 \u00eentr-un router WiFi al unei birouri la distan\u021b\u0103, de exemplu), aceast\u0103 tabel\u0103 poate con\u021bine de asemenea a\u0219a numita \u201eframed route\u201d \u2014 prefixul re\u021belei care se afl\u0103 \u201e\u00een spatele\u201d cardului SIM, care va fi anun\u021bat tuturor dispozitivelor din re\u021bea prin protocoalele de rutare dinamic\u0103.<\/p>\n<h3>Nu doar cu GGSN<\/h3>\n<p>\nPe l\u00e2ng\u0103 furnizarea adreselor, trebuie s\u0103 livr\u0103m \u0219i traficul abona\u021bilor c\u0103tre re\u021belele clientului, fiecare c\u0103tre a sa. Aici, totul func\u021bioneaz\u0103 deja \u00eentr-un mod mult mai tradi\u021bional. Pe GGSN, traficul specializat pentru lucrul cu APN VPN este rutat c\u0103tre un router separat al re\u021belei operatorului (care poate fi denumit \u00een multe feluri, uneori \u2014 router VPN), care la r\u00e2ndul s\u0103u \u00eendepline\u0219te func\u021bia unui PE clasic \u00een schema L3VPN. Acesta adaug\u0103 etichetele, anteturile necesare \u0219i tot ce este necesar \u0219i trimite acest flux de trafic prin routerele re\u021belei de transport c\u0103tre sticurile sau tunelurile preconfigurate c\u0103tre re\u021beaua clientului. Aceast\u0103 parte este mult mai tradi\u021bional\u0103 \u0219i a fost descris\u0103 de multe ori \u00een alte locuri, prin urmare, nu voi insista asupra ei \u00een acest material.<\/p>\n<p>Av\u00e2nd \u00een vedere toate aceste detalii, metodele de organizare a VPN-ului mobil pot fi multiple \u0219i vor diferi \u00eentre ele prin combina\u021bia urm\u0103toarelor tr\u0103s\u0103turi:<\/p>\n<ul>\n<li>Adresele IP, a\u0219a cum a fost descris anterior, pot fi alocate dinamic (adic\u0103 o adres\u0103 diferit\u0103 de fiecare dat\u0103 dintr-un subnet specificat) \u0219i static (aceea\u0219i adres\u0103 de fiecare dat\u0103 pentru un anumit abonat), ceea ce este determinat de \u0219i\/sau configura\u021biile APN \u0219i\/sau de configura\u021biile serverului RADIUS;<\/li>\n<li>Adresele IP pot fi alocate de un server RADIUS administrat de operator sau de un server administrat de client;<\/li>\n<li>Dispozitivele conectate la VPN-ul mobil pot interac\u021biona fie \u00eentre ele, fie pot avea acces la re\u021beaua obi\u0219nuit\u0103 L3VPN a clientului printr-un interfa\u021b\u0103 direct\u0103 (port VPN) cu operatorul sau prin tunelare prin re\u021beaua Internet;<\/li>\n<li>\u00cen unele cazuri, utilizarea unui nume de utilizator \u0219i a unei parole pentru activarea cu succes a sesiunii poate fi obligatorie, iar uneori nu este necesar nici m\u0103car s\u0103 complet\u0103m c\u00e2mpul \u201eAPN\u201d.<\/li>\n<\/ul>\n<p>\nExist\u0103 multe astfel de combina\u021bii cu diferite tipuri de tunelare, echilibrarea traficului \u00eentre canalele de acces la \u201eVPN-ul principal\u201d al clientului \u0219i principiul de alocare a adreselor. Pentru majoritatea cazurilor, schema general\u0103 arat\u0103 \u00een felul urm\u0103tor:<br \/>\n<img decoding=\"async\" alt=\"VPN pentru dispozitive mobile la nivel de re\u021bea\" src=\"\/wp-content\/uploads\/2019\/03\/21a31a5a1448e514bad6a96d8b928409.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen cele din urm\u0103, dup\u0103 un proces destul de rapid de \u00eenregistrare online \u0219i ob\u021binerea adresei IP, dispozitivul prime\u0219te acces la re\u021beaua clientului, iar re\u021beaua clientului ob\u021bine acces la dispozitiv. \u00cen acest timp, abonatul este izolat de to\u021bi ceilal\u021bi abona\u021bi ai operatorului, care nu au leg\u0103tur\u0103 cu clientul specific, nu este necesar\u0103 nicio configura\u021bie suplimentar\u0103, iar tot traficul este direc\u021bionat f\u0103r\u0103 alternativ\u0103 c\u0103tre re\u021beaua clientului, unde este procesat conform politicilor interne ale acestuia.<br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/444946\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0440\u0443\u043d\u0435\u0442\u0435 \u0434\u043e \u0441\u0438\u0445 \u043f\u043e\u0440 \u043d\u0430 \u0443\u0434\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u043c\u0430\u043b\u043e \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430 \u043e \u0442\u0430\u043a\u043e\u0439 \u0441\u0442\u0430\u0440\u043e\u0439 \u0438 \u043f\u0440\u043e\u0441\u0442\u043e\u0439, \u043d\u043e \u0443\u0434\u043e\u0431\u043d\u043e\u0439, \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0439 \u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u0432 \u0441\u0432\u044f\u0437\u0438 \u0441 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u0435\u043c \u0418\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0430 \u0432\u0435\u0449\u0435\u0439 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