METHOD, DEVICE AND NETWORK SYSTEM FOR TRANSMITTING DATAGRAM

摘要

Embodiments of the present invention provide a packet transmission method, an apparatus, and a network system. The method includes: receiving an encrypted packet sent by a client by using a virtual private network VPN tunnel, wherein the encrypted packet is sent by the client after the client determines, according to a preset control policy, that the control policy comprises an Internet Protocol address and a port number that are the same as a destination IP address and a destination port number of a packet to be sent encrypts the packet to be sent, and the control policy comprises information about an IP address and a port number of an intranet server that can exchange packets with a security socket layer protocol virtual private network SSL VPN server; decrypting the encrypted packet; and sending the decrypted packet to a corresponding intranet server, wherein a source IP address of the decrypted packet is an external network IP address. The technical solutions provided in the embodiments help transfer packets between external network and intranet over SSL VPN without changing the topological structure of the intranet.