Attempt to configure /etc/network/interfaces.

puppet/dist/host/stentyst/etc/network/interfaces

+# Loopback.
+auto lo
+iface lo inet loopback
+
+# Outside.
+auto eth0
+iface eth0 inet dhcp
+
+# Inside.
+auto eth1
+iface eth1 inet static
+    address 192.168.10.2
+    netmask 255.255.255.0
+    broadcast 192.168.10.255

puppet/fileserver.conf

@@ -2,3 +2,7 @@
 path /etc/puppet/puppet/dist
 allow 192.168.10.0/24
 allow 127.0.0.1/8
+[host]
+path /etc/puppet/puppet/host/%h
+allow 192.168.10.0/24
+allow 127.0.0.1/8

puppet/master/manifests/site.pp

@@ -6,4 +6,12 @@ node default {
 
 node stentyst {
   include puppet
+  file { "/etc/network/interfaces":
+    source => "puppet:///host/etc/network/interfaces",
+    notify => service[networking],
+  }
+
+  service { networking:
+    ensure => running,
+  }
 }