SYSTEM FOR PROVIDING VIRTUAL PRIVATE NETWORK SERVICE

摘要

PROBLEM TO BE SOLVED: To improve the security of a virtual private network utilizing the IP network. SOLUTION: A router device is provided with a VR port 30 for each user of a virtual private network service. Each VR port 30 has a routing table 32 for a corresponding virtual private network. A control channel terminating part 33 and a VPN constitution module 35 set L2TP tunnels between VR ports belonging to the same virtual private network and themselves. A gateway protocol daemon 31 exchanges routing information through the set L2TP tunnels to generate/update the routing tables 32. An inputted packet is routed in accordance with the routing tables 32.