Menene VPN Tunnel? Tsarin Fasaha Mai Zurfi

A cikin hanyar sadarwa ta kamfanoni da tsaro na yanar gizo, ana ɗaukar intanet a matsayin hanyar wucewa mara aminci, ba tare da amincewa ba. Lokacin da wani maƙura (endpoint) ke aika fakitin bayanai ta hanyar jama'a, waɗannan fakitin suna da rauni ga satar bayanai ba tare da izini ba, bincike mai zurfi na fakitin da gwamnati ke ɗaukar nauyi (DPI), hare-haren allura, da nazarin zirga-zirgar bayanai.

Don ƙara rage waɗannan raunin tsarin, masu sadarwa na hanyar sadarwa suna tura wani tunnel na VPN (Virtual Private Network). Maimakon wakiltar wata hanya ta zahiri, tunnel na VPN hanya ce ta ma'ana ta haɗin kai tsaye da aka ɗora a kan filin jama'a na hanyoyin sadarwa. Yana amfani da ingantattun hanyoyin ɓoye bayanai don gina wata hanya ta kariya ta bayanai a kan hanyoyin sadarwa na WAN (wide-area networks) marasa tsaro.

Injiniyoyin Tunneling Biyu: Rufewa vs. Tsarewa

Babban kuskuren fahimta shine cewa tunneling da encryption abu daya ne. A zahirin gine-gine, hanyar VPN mai aminci sakamakon ayyuka biyu ne daban-daban na layin hanyar sadarwa da ke aiki tare.

1. Ƙunshewa (Tsarin Tafiyar da Hanyoyin)

Ƙunshewa shine tsarin shigar da fakitin bayanai na asali a cikin sabon fakitin sufuri gaba ɗaya. Fakitin asali—tare da kayan aikinsa na ciki, shugabannin layin sufuri (TCP/UDP), da adiresoshin IP na asali/inda aka nufa—ana ɗaukar su azaman bayanan danye.

Ka'idar tunneling tana haɗa babban kai na cibiyar sadarwa zuwa wannan fakitin. Wannan babban kai yana lissafa IP na jama'a na yanzu na abokin ciniki a matsayin tushen, da kuma ƙofar VPN mai nisa a matsayin makoma. Wannan yana ba da damar masu amfani da hanyoyin sadarwa na tsakiya su motsa fakitin ta hanyar teburin jagora na yau da kullun ba tare da gano irin nau'in zirga-zirgar da ke ɓoye a ciki ba.

2. Rufe bayanai (Layin Tsaro)

Ba tare da ɓoye bayanai ba, encapsulation wani dabara ce ta gudanar da hanyoyin sadarwa kawai (kamar tsohon GRE ko tunnels na L2TP masu zaman kansu). Don kiyaye bayanan, ana shigar da sirrin cryptographic na symmetric—mafi yawanci AES-256-GCM ko ChaCha20-Poly1305—a cikin tsarin.

Injin ɓoye bayanan yana rutsawa dukkan fakitin ciki na asali. Ko da maƙiyi ya kama fakitin a tsakiyar tafiya, ba za su iya ganin metadata, gidajen yanar gizo da ake niyya, ko kayan aikin aikace-aikacen da ba a sarrafa ba. Bayanan suna kama da hayaniyar haɗe-haɗe mai yawan rikiɗa.

Cikakken Gudun Fakit: Rayuwar Fakit ɗin Tunnela

Don lura da yadda bayanai ke ratsa ƙofar VPN, yi la'akari da zagayowar rayuwa mataki-mataki na buƙatar HTTP mai fita guda ɗaya wanda aka fara daga na'urar mai amfani:

Mataki na 1: Kamewa na Gida da Sarrafa Crypto

• Mataki 1: Tsarin aiki na mai amfani yana samar da fakitin IP wanda aka nufa don hanyar yanar gizo ta waje.
• Mataki na 2: Direban adaftar hanyar sadarwa na kama-da-wane (hanyar TAP/TUN) yana shiga cikin teburin routing na OS kuma ya kama fakitin fita kafin ya kai ga Kat ɗin Hanyar Sadarwa na jiki (NIC).
• Mataki na 3: Manhajar abokin VPN tana aiwatar da hannun musayar maɓalli (misali, ta IKEv2 ko Curve25519) don kafa maɓallan zaman na wucin gadi. Bayan haka, tana rufa fakitin IP na ciki kuma tana saka alamomin tabbatarwa don tabbatar da ingancin bayanai.

Mataki na 2: Wucewa ta WAN

• Mataki na 4: Katin hanyar sadarwa na zahiri yana watsa sabon rufaffen fakitin UDP/TCP.
• Mataki 5: Routers na intanet na jama'a suna karantawa kawai babban kai na IP na waje. Fakitin yana tsalle tsakanin tsarin mai cin gashin kansa (ASNs) har sai ya sauka a hanyar waje ta Sabar hanyar sadarwa ta VPN da aka yi niyya (VNS).

Mataki na 3: Cire Rufin Gateway da Fita

• Mataki na 6: Tashar VPN tana dace da Fihirisar Siginon Tsaro (SPI) na fakiti, ta tabbatar da sa hannun ɓoye, sannan ta ɓoye maƙasudin kayan aikin cikin rubutu na fili.
• Mataki 7: Ƙofar tana cire kanun hanyar tunneling na waje. Sai ta aiwatar da Fassarar Adireshin Cibiyar Sadarwa (NAT), maye gurbin asalin IP na sirri na abokin ciniki da adireshin IP na jama'a na ƙofar.
• Mataki 8: Fakitin mai tsabta ana tura shi zuwa uwar garken yanar gizo na jama'a, yana tabbatar da cewa tsarin hanyar sadarwa na gidan mai amfani’s da yanayin ƙasa sun kasance gabaɗaya a ɓoye.

WireGuard

Ta hanyar aiki kai tsaye a cikin sararin kernel, WireGuard yana guje wa babban nauyin canjin mahallin tsakanin sararin mai amfani da sararin kernel. Yana watsar da tattaunawar sirrin da ta gabata a kan tushen tsarin hanyar sirrin key, wanda ke haifar da jinkirin ƙasa da kuma yawan aiki mai girma.

OpenVPN

Saboda OpenVPN na iya aiki a kan TCP port 443, yana iya haɗuwa daidai da zirga-zirgar TLS-encrypted HTTPS na yau da kullun. Wannan sassauƙar tsari tana ba shi damar wucewa ta hanyar binciken fakitin zurfin wuta waɗanda da gangan ke sauke bayanan UDP marasa daidaituwa.

IKEv2/IPsec

Yin amfani da tsawaita ka'idar MOBIKE (Mobile IKE), IKEv2 ya yi fice wajen kiyaye yanayin zaman aiki lokacin da wurin ƙarshe ya canza hanyar sadarwar sa ta hanyar yanar gizo (misali, barin haɗin Wi-Fi na gida nan take ya ɗaure da hanyar sadarwar hannu ta 5G).

Matsalolin Cunkoso na Injiniya & Rage Haɗarin Cibiyar Sadarwa

Tura VPN na matakin kamfani ko na mai amfani yana haifar da ƙayyadaddun ƙuntatawa na injiniyan hanyar sadarwa waɗanda ke buƙatar ingantawa a hankali:

Rage MTU da Fashewar Fakiti

Saboda ɗaukar hoto yana tattara ƙarin kawuna a kusa da fakitin IP da ke akwai, girman fakitin gabaɗaya yana ƙaruwa. Idan girman fakitin da aka samu ya wuce iyakar watsa jiki na hanyar sadarwa (MTU)—yawanci 1500 bytes—dole ne a yi rarrabuwar fakitin.

Ragewa na haifar da mummunan raguwar aiki, asarar fakiti, da kuma nauyi mai yawa akan CPU. Masu gudanar da hanyar sadarwa suna magance wannan ta hanyar rage MTU na mu'amalar kama-da-wane (yawanci zuwa 1420 ko 1280 bytes) da kuma saita MSS Clamping (Matsakaicin Girman Sashe) don tilasta wa maƙasudan su yi shawarwarin ƙananan nauyi yayin farkon musafaha na TCP.

Hukuncin Rufe Biyu

Tsofaffin tsarin kamar L2TP/IPsec suna fama da ɓarnar gine-gine. L2TP yana rufe fakiti a Layer 2 don ɗaukar tsoffin ka'idojin hanyar sadarwa, sannan IPsec ya rufe shi. sake Don samar da tsaron bayanai. Wannan kewaye biyu yana ɓata bandwidth, yana kawo nauyi mai yawa na sarrafawa, kuma yana rage ƙarfin aikin cibiyar sadarwa gaba ɗaya idan aka kwatanta da tsarin gine-ginen tunnel na zamani mai layi ɗaya.

Tabbatar da Tsaro: Sanya VPN Kyauta cikin Aminci

Saboda tushen abubuwan farko na cryptographic (kamar injin OpenVPN ko kayan aikin kernel na WireGuard) suna da cikakken budaddiyar tushe kuma babu kuɗin lasisi, abu ne mai yiwuwa gaba ɗaya a tura hanyar VPN mai aminci, mai darajen soja ta amfani da gine-ginen VPN kyauta.

Duk da haka, daga mahangar bincike, tsaron rami ya dogara ne da ingancin kayan aikin aiwatar da shi. Yayin da kake tantance zaɓuɓɓukan hanyar sadarwa kyauta, dole ne ka tabbatar da buƙatun aiki guda uku masu mahimmanci:

1. Tsarin Zero-Logs: Tabbatar da cewa kayan aikin mai samar da sabis ɗin suna amfani da sabobin da ba su da diski, kawai RAM, don tabbatar da cewa bayanan da aka ɓoye a ƙofar tunnel ɗin ba a taɓa adana su ba.
2. Kariyar Leak ta DNS mai ƙarfi: Dole ne aikace-aikacen VPN ya tilasta manufofin hanyar sadarwa masu tsauri waɗanda ke tilasta duk tambayoyin DNS su wuce kai tsaye ta hanyar ramin da aka ɓoye maimakon fitowa zuwa masu warware DNS na ISP na asali.
3. Tsaron Sirri: Tabbatar da cewa mai ba da sabis ya gama kawar da gaba ɗaya nau'ikan tunneling na tsoho, karyayyu kamar PPTP da L2TP mai zaman kansa, waɗanda ke da raunin da aka sani da ke iya fuskantar ɓoyewa da kuma canjawa.