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Westermo is a company that develops industrial standardized network equipment for harsh environments. Our task was to help the company prepare for future demands regarding IP communication. Westermo has customers and branches around the world, in order to meet market demands and competitor development IP version 6 support is of great interest.Next generation of IP communication is IPv6 and to prepare for the future and present market demands IPv6 support is needed in Westermo´s products. This thesis assignment is meant to investigate and give a proof of concept solution for basic IPv6 support in Westermo Operating System (WeOS).The areas of interest this thesis involves are IP settings and routing support. IP settings include ability to activate IPv6, assigning address to interface and related tasks. Routing support imply creation of routes and default-gateway, that gives the switches basic IPv6 routing capabilities. Switches should be capable of sending IPv6 router advertisement messages, and perform static IPv6 routing.Performing changes in IPv6 support means that modifications in the Command Line Interface (CLI)-context are necessary, in order to make configuration user-friendly. Therefore a proposed extension of the CLI-syntax is required. Implementations of the proposed CLI-syntax are done into Westermo´s main operating system WeOS.Our work has fulfilled the general expectations and placed a foundation for IPv6 support. Through proof of concept tests and implementations, WeOS is close to reach and meet the primary functionality with IPv6.Westermo is a company that develops industrial standardized network equipment for harsh environments. Our task was to help the company prepare for future demands regarding IP communication. Westermo has customers and branches around the world, in order to meet market demands and competitor development IP version 6 support is of great interest.Next generation of IP communication is IPv6 and to prepare for the future and present market demands IPv6 support is needed in Westermo´s products. This thesis assignment is meant to investigate and give a proof of concept solution for basic IPv6 support in Westermo Operating System (WeOS).The areas of interest this thesis involves are IP settings and routing support. IP settings include ability to activate IPv6, assigning address to interface and related tasks. Routing support imply creation of routes and default-gateway, that gives the switches basic IPv6 routing capabilities. Switches should be capable of sending IPv6 router advertisement messages, and perform static IPv6 routing.Performing changes in IPv6 support means that modifications in the Command Line Interface (CLI)-context are necessary, in order to make configuration user-friendly. Therefore a proposed extension of the CLI-syntax is required. Implementations of the proposed CLI-syntax are done into Westermo´s main operating system WeOS.Our work has fulfilled the general expectations and placed a foundation for IPv6 support. Through proof of concept tests and implementations, WeOS is close to reach and meet the primary functionality with IPv6.