Point-to-Point Tunneling Protocol yog cov txheej txheem network feem ntau siv nrog Windows khoos phis tawj. Niaj hnub no, nws tau suav tias yog siv tsis tau siv hauv virtual ntiag tug network vim nws paub ntau yam kev ruaj ntseg tsis txaus. Txawm li cas los xij, PPTP tseem siv tau hauv qee lub network.
Keeb Kwm Ntawm PPTP
PPTP yog lub network tunneling raws tu qauv uas tau tsim nyob rau hauv 1999 los ntawm ib tug neeg muag khoom consortium tsim los ntawm Microsoft, Ascend Communications (hnub no ib feem ntawm Nokia), 3Com, thiab lwm pab pawg neeg. PPTP tau tsim los txhim kho ntawm nws qhov ua ntej Point-to-Point Protocol, cov ntaub ntawv txuas txheej (Txheej 2) raws tu qauv tsim los txuas ob lub routers ncaj qha.
Thaum nws tau suav tias yog txoj cai ceev thiab ruaj khov rau Windows tes hauj lwm, PPTP tsis suav tias muaj kev nyab xeeb ntxiv lawm. PPTP tau raug hloov los ntawm kev nyab xeeb thiab ruaj ntseg dua VPN tunneling raws tu qauv, suav nrog OpenVPN, L2TP/IPSec, thiab IKEv2/IPSec.
Yuav ua li cas PPTP ua haujlwm
PPTP yog qhov kev loj hlob ntawm PPP, thiab yog li ntawd, yog raws li nws qhov kev lees paub thiab encryption moj khaum. Zoo li txhua yam kev siv thev naus laus zis, PPTP encapsulates cov ntaub ntawv pob khoom, tsim lub qhov rau cov ntaub ntawv kom ntws hla tus IP network.
PPTP siv tus neeg siv khoom-tus qauv tsim (cov kev qhia tshwj xeeb muaj nyob hauv Internet RFC 2637) uas ua haujlwm ntawm Txheej 2 ntawm OSI qauv. Thaum lub VPN qhov tau tsim, PPTP txhawb nqa ob hom ntaub ntawv ntws:
- Control lus rau kev tswj thiab nws thiaj li rhuav tshem qhov kev sib txuas VPN. Tswj cov lus hla ncaj qha ntawm tus neeg siv khoom VPN thiab server.
- Cov ntaub ntawv pob khoom uas dhau los ntawm qhov av, piv txwv li mus lossis los ntawm tus neeg siv VPN.
Tib neeg feem ntau tau txais PPTP VPN server chaw nyob cov ntaub ntawv los ntawm lawv tus thawj tswj hwm server. Cov hlua txuas tuaj yeem yog lub npe server lossis chaw nyob IP.
kab hauv qab
PPTP siv General Routing Encapsulation tunneling los encapsulate cov ntaub ntawv pob ntawv. Nws siv TCP chaw nres nkoj 1723 thiab IP chaw nres nkoj 47 los ntawm Kev Tswj Xyuas Kev Thauj Mus Los. PPTP txhawb nqa txog li 128-ntsis encryption keys thiab Microsoft Point-to-Point Encryption qauv.
Tunneling hom: yeem thiab yuam
Cov txheej txheem txhawb nqa ob hom kev tunneling:
- Voluntary Tunneling: Ib hom tunneling uas yog pib los ntawm tus neeg siv khoom ntawm kev sib txuas uas twb muaj lawm nrog lub server.
- Compulsory Tunneling: Ib hom kev tunneling pib los ntawm PPTP server ntawm ISP, uas yuav tsum muaj cov chaw taws teeb nkag mus rau cov chaw taws teeb tsim lub qhov.
Puas yog PPTP tseem raug siv?
Txawm hais tias nws muaj hnub nyoog thiab kev ruaj ntseg tsis txaus, PPTP tseem siv hauv qee qhov kev siv network-feem ntau hauv kev lag luam hauv VPNs hauv cov chaw ua haujlwm laus. Qhov zoo ntawm PPTP yog tias nws yooj yim rau kev teeb tsa, nws ceev, thiab vim tias nws tau tsim nyob rau hauv ntau lub platform, koj tsis tas yuav muaj software tshwj xeeb los siv nws. Txhua yam koj xav tau los teeb tsa kev sib txuas yog koj daim ntawv pov thawj nkag thiab chaw nyob server.
Txawm li cas los xij, qhov tseeb tias nws yooj yim siv tsis tau txhais hais tias koj yuav tsum siv nws, tshwj xeeb tshaj yog tias muaj kev ruaj ntseg siab yog qhov tseem ceeb rau koj. Nyob rau hauv tas li ntawd, koj yuav tsum siv ib tug ruaj ntseg raws tu qauv rau koj VPN network, xws li OpenVPN, L2TP/IPSec, los yog IKEv2/IPSec.
