Fostering network administrators for networks including Linux servers is essential. We developed a system to provide a Linux network administration training environment by exploiting User-mode Linux virtual machine software and called it the Linux Network Simulator (LiNeS). LiNeS works on a Linux PC and provides virtual networks consisting of virtual Linux servers, routers, switching hubs, and clients. LiNeS are designed to provide training environments where students administer virtual networks alone. However, the virtual networks in each student's PC are isolated: meaning they cannot telecommunicate with each other. This study developed a function that students practice by performing Linux network administration tasks with considering networks administrated by other students. In this paper, we describe how to interconnect each isolated network and discuss performance by preliminary evaluation experiences. © 2009 Springer-Verlag Berlin Heidelberg.