The Internet Gateway for GB7ZP which interfaces to the Icom repeater controller is a 1U high 19" rack unit

The very first gateway ran CentOS-5 (RedHat-5) and was succeeded in 2019 by a newer CentOS-7 machine pictured below.

Most recently in mid-2024 this was itself replaced by a totally new model with Alma-Linux-9 pictured above right (a newer RedHat clone) and the latest Icom G3.2 software. The systems use multicore CPUs and solid-state drives

Internet Routing/NAT now uses a Ubiquity ER-4 EdgeRouter, a major upgrade from the original 2012 Netgear unit.