diff --git a/Propellor.hs b/Propellor.hs
index 63040ff..d8c1ddb 100644
--- a/Propellor.hs
+++ b/Propellor.hs
@@ -2,6 +2,7 @@ import Common
 import CmdLine
 import qualified Property.File as File
 import qualified Property.Apt as Apt
+import qualified Property.Network as Network
 import qualified Property.Ssh as Ssh
 import qualified Property.Sudo as Sudo
 import qualified Property.User as User
@@ -24,6 +25,7 @@ getProperties hostname@"clam.kitenet.net" =
 	, standardSystem Apt.Unstable
 	-- Clam is a tor bridge, and an olduse.net shellbox.
 	, Tor.isBridge
+	, ipv6to4
 	, JoeySites.oldUseNetshellBox
 	-- I play with docker on clam.
 	, Docker.configured
diff --git a/Property/Network.hs b/Property/Network.hs
new file mode 100644
index 0000000..7686c8b
--- /dev/null
+++ b/Property/Network.hs
@@ -0,0 +1,26 @@
+module Property.Network where
+
+import Common
+import qualified Property.File as File
+
+interfaces :: FilePath
+interfaces = "/etc/network/interfaces"
+
+-- 6to4 ipv6 connection, should work anywhere
+ipv6to4 :: Property
+ipv6to4 = fileProperty "ipv6to4" go interfaces
+	`onChange` ifUp "sit0"
+  where
+	go ls
+		| all (`elem` ls) stanza = ls
+		| otherwise = ls ++ stanza
+	stanza =
+		[ "# Automatically added by propeller"
+		, "iface sit0 inet6 static"
+		, "	address 2002:5044:5531::1"
+		, "	netmask 64"
+		, "	gateway ::192.88.99.1"
+		, "# End automatically added by propeller"
+
+ifUp :: String -> Property
+ifUp iface = cmdProperty "ifup" [Param iface]