Extending DHCPLB: The path from load balancer to server

What this post added

This post details the evolution of Meta's DHCP infrastructure, moving from ISC-DHCP to Kea, and finally to a new DHCPLB server architecture. The key contribution is the development of a multithreaded DHCPLB server that replaces the single-threaded Kea, addressing performance bottlenecks related to the Recv-Q buffer and backend calls. This new architecture significantly improves throughput, reduces server count by 10x, and enhances iteration speed. The post also highlights the development of a new Go-based DHCP library and the open-sourcing of the DHCPLB framework, contributing to the broader community.