It looks like @host.interfaces isn't allowed in the safe mode.

Also, the subnet information isn't stored with the interface, so it's not possible to retrieve it, even with safe_mode off.

Ideally, it'd be then possible to add

<% @host.interfaces.each do |int| >
network --bootproto=static --hostname=<= int.name > --ip=<= int.ip > --netmask=<= int.subnet > --gateway=<= int.gateway >
< end %>

to the kick start templates (or something along these lines that checks for dhcp, etc)