This article is an introduction to different default gateway solutions. Those technologies are enabling devices on IPv4 local subnets to have more than one Default gateway configured or at least some configuration that make them work half the way of ideal redundant solution. Idea behind this article is to be an introduction to a set of articles that will explain different redundancy solutions based on IPv6 technology. Some of those technologies, will be used in future and some of them already existing and suggested to be used from day one on IPv6 implementation.
Default gateway is the next hop address of the device that leads the packets out of the local LAN segment. If there are packets destined to an IP address that is not from local subnet PC will forward those packets usually to router device that will have the information where to forward those packets in order to get them transferred towards the destination.