Method and system for address conflict resolution

A system for resolving conflict between addresses assigned in the system, wherein the system is an internet protocol (IP) remote access system comprising:

• a client and a server, the client connected with the server via an external communication network;
• an internal network connected to the server, the internal network comprising a plurality of internal network addresses, and the client in communication with the internal network via the server;
• and
• a network address translator (NAT) router connected to the client for communication with the server via the external communication network;
• the client having IP address information, and the client comprising a send and request module for sending a request to the server for a virtual IP address together with the IP address information of the client for conflict resolution;
• the server comprising a conflict resolution module for receiving the request from the client, comparing the IP address information of the client with the plurality of internal network addresses of the internal network of the server for any conflicts of addresses to determine conflicted internal network subnet addresses, assigning a respective conflict resolving network subnet address for each conflicted internal network subnet address conflicting with the IP address information of the client, mapping each conflicted internal network subnet address of the internal network of the server to each assigned respective conflict resolving network subnet address for the client, and sending a reply with the assigned conflict resolving network subnet address and non-conflicting virtual IP address to the client for enabling communication between the client and the internal network via the server,
• wherein the client is an internet protocol security remote access client (IRAC) and the server is an internet protocol security remote access server (IRAS), and the client and server use internet key exchange version 2 (IKEv2) for IP security (IPSec) tunnel establishment.

A server for resolving conflicts between addresses assigned in an internet protocol (IP) remote access system, the system including:

• a client having IP address information connected with the server via an external communication network;
• an internal network connected to the server, the internal network comprising a plurality of internal network addresses, wherein the client is in communication with the internal network via the server;
• and
• a network address translator (NAT) router connected to the client for communication with the server via the external communication network;
• the server comprising:
• a conflict resolution module for receiving a request from the client for a virtual IP address together with the IP address information of the client for conflict resolution, comparing the IP address information of the client with the plurality of internal network addresses of the internal network of the server for any conflicts of addresses to determine conflicted internal network subnet addresses, assigning a respective conflict resolving network subnet address for each conflicted internal network subnet address conflicting with the IP address information of the client, mapping each conflicted internal network subnet address of the internal network of the server to each assigned respective conflict resolving network subnet address for the client, and sending a reply with the assigned conflict resolving network subnet address and non-conflicting virtual IP address to the client for enabling communication between the client and the internal network via the server,
• wherein the client is an internet protocol security remote access client (IRAC) and the server is an internet protocol security remote access server (IRAS), and the client and server use internet key exchange version 2 (IKEv2) for IP security (IPSec) tunnel establishment.