Chapter 6. Ipsec / Pptp / L2Tp Vpn; Figure 71: Example Of Gateway-To-Gateway Ipsec Vpn Tunnel Using Two Dsr Routers Connected To The Internet - D-Link DSR-150 User Manual

Unified Services Router

Chapter 6. IPsec / PPTP / L2TP VPN

A VPN p ro v id es a s ecu re co mmu n icat io n ch an n el ("t u n n el") b et ween t wo g at eway
ro u t ers o r a remo t e PC clien t . Th e fo llo win g t y p es o f t u n n els can b e creat ed :

Gat eway -t o -g ateway VPN: t o co n n ect t wo o r mo re ro u t ers t o s ecure t raffi c b et ween
remo t e s it es .

Remo t e Clien t (clien t -t o -g at eway VPN t u n n el): A remo t e clien t in it iat es a VPN
t u n n el as t h e IP ad d res s o f t h e remo t e PC clien t is n o t kn o wn in ad v an ce. Th e
g at eway in t h is cas e act s as a res p o n d er.

Remo t e clien t b eh in d a NA T ro u t er: Th e clien t h as a d y n amic IP ad d res s an d is
b eh in d a NA T Ro u t er. Th e remo t e PC clien t at t h e NA T ro u t er in it ia t es a VPN
t u n n el as t h e IP ad d res s o f t h e remo t e NA T ro u t er is n o t kn o wn in ad v an ce. T h e
g at eway W A N p o rt act s as res p o n d er.

PPTP s erv er fo r LA N / W A N PPTP clien t co n n ect io n s .

L2TP s erv er fo r LA N / W A N L2TP clien t co n n ect io n s .
Figure 71 : Example of Gate way-to - Gate way IPs e c VPN tunne l us ing two
DSR route rs conne cte d to the Inte rne t
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