During June 2025, Alexandre Vilain focused on improving network stability within the SagerNet/gvisor repository by addressing a critical issue related to MTU propagation in sandbox environments. He identified that MTU values were not consistently copied when creating network interfaces and routes from a network namespace, which could lead to configuration drift and performance issues. By implementing a fix in Go, Alexandre ensured that MTU values are now properly propagated, resulting in more reliable and consistent network setups. His work leveraged skills in Go development, network configuration, and system programming, demonstrating a thoughtful approach to maintaining robust sandbox networking infrastructure.