We consider extended LANs composed of two different parts: a static one with hosts and routers, and a dynamic one with mobile hosts. We propose a scheme for interconnecting the two parts that builds on OLSR to establish compact routing tables, by aggregating addresses into prefixes whenever possible. Prefix advertisements imply possible conflicts of prefixes covering the same address ranges, thus we propose an extension to OLSR for solving this issue. We report on performance improvement measured on an experimental testbed.