VPN Protokollari -
IP security (IPsec) - SSL (Secure Sockets Layer)
- PPTP (Point to Point Tunneling Protocol)
- L2F (Layer 2 Forwarding protocol)
- L2TP (layer 2 Tunneling Protocol
PPTP (ingl. Point-to-Point Tunneling Protocol) — tunnelli nuqta-nuqta protokoli,
kompyuterlarga server bilan standart tarmog’ (himoyalanmagan tarmoq) da maxsus tunnel yaratish
orqali himoyalangan aloqani o’rnatuvchi protokol. PPTP protokoli PPP kadrlarini IP-paketlarga
joylashtiradi va bu orqali global IP-tarmoqdan yuboradi, masalan, Internet orqali. PPTP bundan
tashqari ikki lokal tarmoqda tunnel tashkillashtirish uchun ham qo’llaniladi. PPTP qo’shimcha
TCP-bog’lanishdan foydalangan holatda tunnelga xizmat ko`rsatadi.
L2F (Layer 2 Forwarding protocol) – bu tunnelashtirish protokollarining biri. Ushbu
protokol Cisco Systems tomonidan internet orqali VPN aloqasini yaratish uchun ishlab chiqarilgan.
L2TP (Layer 2 Tunneling Protocol) Microsoft PPTP (Point-to-Point Tunneling Protocol) va
Cisco L2F (Layer 2 Forwarding) ning kombinatsiyasi hisoblanadi. L2TP IP, X.25, Frame Relay
yoki ATM tarmoqlari orqali jo'natiladigan PPP (Point-to-Point Protocol) kvadratlarini qamrab olish
uchun tunnel protokoli sifatida ishlatilishi mumkin. Ko'p yo'nalishlarga bitta tunnel orqali ruxsat
beriladi.
183
Ishning bajarish tartibi 16.1-rasm. Tadqiq qilinayotgan tarmoq
Manzillar jadvali Qurilma
Interfeys
IP-manzil
Tarmoq maskasi
R0
Fa0/0
192.168.1.1
255.255.255.0
Fa0/1
195.158.1.1
255.255.255.252
R1
Fa0/0
195.158.1.2
255.255.255.252
Fa0/1
80.80.80.1
255.255.255.252
R2
Fa0/1
80.80.80.2
255.255.255.252
Fa0/0
172.16.1.1
255.255.255.0
PC0
NIC
192.168.1.10
255.255.255.0
PC1
NIC
172.16.1.10
255.255.255.0
