Setup local server(s) & make our own network infrastructure, rather than "fixing the problems of internet access" by paying for increased bandwidth,
Prefer "read/write" networks to those that "just work" ,
Prefer pocket servers to those in the clouds,
Embrace a diversity of network topologies and different scales (machine to machine, local nodes, institutional infrastructure) and consider the implications of working with each, rather than a Web 2.0 model where resources must be uploaded onto "the 24/7 Internet (tm)" in order to share them,
Invite users to look critically at the implications of any infrastructural decisions, rather than imagining utopic and/or "killer" solutions,
Make that which is normally hidden and invisible (tending to surveillance), explicit and shared (as a gesture of collective authorship), for instance: instead of caching web resources (silently), we imagine services to archive pages and share them locally as networked cookbooks, rather than logging IRC conversations on a server or database accessible only by administrators, we imagine (local) logs available for reading / editing by participants and published conditionally.
The provided network is a starting point; during summer school the network topology can be tweaked, changed, extended. To this end, participants are encouraged to bring network devices (pirate box / openwrt routers / pi's / olimex / other obscure objects with ethernet ports).