diff --git a/build b/build
index a3a679f2..7ceb4c9a 100755
--- a/build
+++ b/build
@@ -6,13 +6,14 @@ PKGVER=${PKGVER:-$(sh contrib/semver/version.sh --bare)}
 
 LDFLAGS="-X $PKGSRC.buildName=$PKGNAME -X $PKGSRC.buildVersion=$PKGVER"
 
-while getopts "udmtc:l:" option
+while getopts "udaitc:l:" option
 do
   case "${option}"
   in
   u) UPX=true;;
   d) DEBUG=true;;
-  m) MOBILE=true;;
+  i) IOS=true;;
+  a) ANDROID=true;;
   t) TABLES=true;;
   c) GCFLAGS="$GCFLAGS $OPTARG";;
   l) LDFLAGS="$LDFLAGS $OPTARG";;
@@ -23,17 +24,23 @@ if [ -z $TABLES ]; then
   STRIP="-s -w"
 fi
 
-for CMD in `ls cmd/` ; do
-  echo "Building: $CMD"
+if [ $IOS ]; then
+  echo "Building framework for iOS"
+  gomobile bind -target ios -tags mobile -ldflags="$LDFLAGS $STRIP" -gcflags="$GCFLAGS" github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil
+elif [ $ANDROID ]; then
+  echo "Building aar for Android"
+  gomobile bind -target android -tags mobile -ldflags="$LDFLAGS $STRIP" -gcflags="$GCFLAGS" github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil
+else
+  for CMD in `ls cmd/` ; do
+    echo "Building: $CMD"
 
-  if [ $MOBILE ]; then
-    go build -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" -tags mobile -v ./cmd/$CMD
-  elif [ $DEBUG ]; then
-    go build -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" -tags debug -v ./cmd/$CMD
-  else
-    go build -ldflags="$LDFLAGS $STRIP" -gcflags="$GCFLAGS" -v ./cmd/$CMD
-  fi
-  if [ $UPX ]; then
-    upx --brute $CMD
-  fi
-done
+    if [ $DEBUG ]; then
+      go build -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" -tags debug -v ./cmd/$CMD
+    else
+      go build -ldflags="$LDFLAGS $STRIP" -gcflags="$GCFLAGS" -v ./cmd/$CMD
+    fi
+    if [ $UPX ]; then
+      upx --brute $CMD
+    fi
+  done
+fi
diff --git a/src/yggdrasil/awdl.go b/src/yggdrasil/awdl.go
index 65e84cb5..633d5f9c 100644
--- a/src/yggdrasil/awdl.go
+++ b/src/yggdrasil/awdl.go
@@ -34,42 +34,42 @@ func (l *awdl) init(c *Core) error {
 	return nil
 }
 
-func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte, boxPubKey *crypto.BoxPubKey, sigPubKey *crypto.SigPubKey, name string) (*awdlInterface, error) {
-	/*
-		myLinkPub, myLinkPriv := crypto.NewBoxKeys()
-		meta := version_getBaseMetadata()
-		meta.box = l.core.boxPub
-		meta.sig = l.core.sigPub
-		meta.link = *myLinkPub
-		metaBytes := meta.encode()
-		l.core.log.Println("toAWDL <- metaBytes")
-		toAWDL <- metaBytes
-		l.core.log.Println("metaBytes = <-fromAWDL")
-		metaBytes = <-fromAWDL
-		l.core.log.Println("version_metadata{}")
-		meta = version_metadata{}
-		if !meta.decode(metaBytes) || !meta.check() {
-			return nil, errors.New("Metadata decode failure")
-		}
-		base := version_getBaseMetadata()
-		if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
-			return nil, errors.New("Failed to connect to node: " + name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
-		}
-		shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
-	*/
-	shared := crypto.GetSharedKey(&l.core.boxPriv, boxPubKey)
+func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte /*boxPubKey *crypto.BoxPubKey, sigPubKey *crypto.SigPubKey*/, name string) (*awdlInterface, error) {
 	intf := awdlInterface{
 		awdl:     l,
 		fromAWDL: fromAWDL,
 		toAWDL:   toAWDL,
 		shutdown: make(chan bool),
-		peer:     l.core.peers.newPeer(boxPubKey, sigPubKey, shared, name),
-		//peer:     l.core.peers.newPeer(&meta.box, &meta.sig, shared, name),
 	}
+	l.mutex.Lock()
+	l.interfaces[name] = &intf
+	l.mutex.Unlock()
+	myLinkPub, myLinkPriv := crypto.NewBoxKeys()
+	meta := version_getBaseMetadata()
+	meta.box = l.core.boxPub
+	meta.sig = l.core.sigPub
+	meta.link = *myLinkPub
+	metaBytes := meta.encode()
+	l.core.log.Println("toAWDL <- metaBytes")
+	toAWDL <- metaBytes
+	l.core.log.Println("metaBytes = <-fromAWDL")
+	metaBytes = <-fromAWDL
+	l.core.log.Println("version_metadata{}")
+	meta = version_metadata{}
+	if !meta.decode(metaBytes) || !meta.check() {
+		return nil, errors.New("Metadata decode failure")
+	}
+	l.core.log.Println("version_getBaseMetadata{}")
+	base := version_getBaseMetadata()
+	if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
+		return nil, errors.New("Failed to connect to node: " + name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
+	}
+	l.core.log.Println("crypto.GetSharedKey")
+	shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
+	//shared := crypto.GetSharedKey(&l.core.boxPriv, boxPubKey)
+	l.core.log.Println("l.core.peers.newPeer")
+	intf.peer = l.core.peers.newPeer(&meta.box, &meta.sig, shared, name)
 	if intf.peer != nil {
-		l.mutex.Lock()
-		l.interfaces[name] = &intf
-		l.mutex.Unlock()
 		intf.peer.linkOut = make(chan []byte, 1) // protocol traffic
 		intf.peer.out = func(msg []byte) {
 			defer func() { recover() }()
@@ -84,6 +84,7 @@ func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte, boxPubKey *crypt
 		go intf.peer.linkLoop()
 		return &intf, nil
 	}
+	delete(l.interfaces, name)
 	return nil, errors.New("l.core.peers.newPeer failed")
 }
 
diff --git a/src/yggdrasil/mobile.go b/src/yggdrasil/mobile.go
index 300d132a..2ffeffb9 100644
--- a/src/yggdrasil/mobile.go
+++ b/src/yggdrasil/mobile.go
@@ -5,15 +5,14 @@ package yggdrasil
 import (
 	"encoding/hex"
 	"encoding/json"
-	"errors"
 	"log"
 	"os"
 	"regexp"
+	"time"
 
 	hjson "github.com/hjson/hjson-go"
 	"github.com/mitchellh/mapstructure"
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
-	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 	"github.com/yggdrasil-network/yggdrasil-go/src/util"
 )
 
@@ -23,6 +22,26 @@ import (
 // that in the case of iOS we handle reading/writing to/from TUN in Swift
 // therefore we use the "dummy" TUN interface instead.
 
+func (c *Core) addStaticPeers(cfg *config.NodeConfig) {
+	if len(cfg.Peers) == 0 && len(cfg.InterfacePeers) == 0 {
+		return
+	}
+	for {
+		for _, peer := range cfg.Peers {
+			c.AddPeer(peer, "")
+			time.Sleep(time.Second)
+		}
+		for intf, intfpeers := range cfg.InterfacePeers {
+			for _, peer := range intfpeers {
+				c.AddPeer(peer, intf)
+				time.Sleep(time.Second)
+			}
+		}
+		time.Sleep(time.Minute)
+	}
+}
+
+// Starts a node with a randomly generated config.
 func (c *Core) StartAutoconfigure() error {
 	mobilelog := MobileLogger{}
 	logger := log.New(mobilelog, "", 0)
@@ -40,9 +59,12 @@ func (c *Core) StartAutoconfigure() error {
 	if err := c.Start(nc, logger); err != nil {
 		return err
 	}
+	go c.addStaticPeers(nc)
 	return nil
 }
 
+// Starts a node with the given JSON config. You can get JSON config (rather
+// than HJSON) by using the GenerateConfigJSON() function.
 func (c *Core) StartJSON(configjson []byte) error {
 	mobilelog := MobileLogger{}
 	logger := log.New(mobilelog, "", 0)
@@ -55,7 +77,9 @@ func (c *Core) StartJSON(configjson []byte) error {
 		return err
 	}
 	nc.IfName = "dummy"
+	//c.log.Println(nc.MulticastInterfaces)
 	for _, ll := range nc.MulticastInterfaces {
+		//c.log.Println("Processing MC", ll)
 		ifceExpr, err := regexp.Compile(ll)
 		if err != nil {
 			panic(err)
@@ -65,9 +89,11 @@ func (c *Core) StartJSON(configjson []byte) error {
 	if err := c.Start(nc, logger); err != nil {
 		return err
 	}
+	go c.addStaticPeers(nc)
 	return nil
 }
 
+// Generates mobile-friendly configuration in JSON format.
 func GenerateConfigJSON() []byte {
 	nc := config.GenerateConfig(false)
 	nc.IfName = "dummy"
@@ -78,90 +104,40 @@ func GenerateConfigJSON() []byte {
 	}
 }
 
+// Gets the node's IPv6 address.
 func (c *Core) GetAddressString() string {
 	return c.GetAddress().String()
 }
 
+// Gets the node's IPv6 subnet in CIDR notation.
 func (c *Core) GetSubnetString() string {
 	return c.GetSubnet().String()
 }
 
+// Gets the node's public encryption key.
+func (c *Core) GetBoxPubKeyString() string {
+	return hex.EncodeToString(c.boxPub[:])
+}
+
+// Gets the node's public signing key.
+func (c *Core) GetSigPubKeyString() string {
+	return hex.EncodeToString(c.sigPub[:])
+}
+
+// Wait for a packet from the router. You will use this when implementing a
+// dummy adapter in place of real TUN - when this call returns a packet, you
+// will probably want to give it to the OS to write to TUN.
 func (c *Core) RouterRecvPacket() ([]byte, error) {
 	packet := <-c.router.tun.recv
 	return packet, nil
 }
 
+// Send a packet to the router. You will use this when implementing a
+// dummy adapter in place of real TUN - when the operating system tells you
+// that a new packet is available from TUN, call this function to give it to
+// Yggdrasil.
 func (c *Core) RouterSendPacket(buf []byte) error {
 	packet := append(util.GetBytes(), buf[:]...)
 	c.router.tun.send <- packet
 	return nil
 }
-
-func (c *Core) AWDLCreateInterface(boxPubKey string, sigPubKey string, name string) error {
-	fromAWDL := make(chan []byte, 32)
-	toAWDL := make(chan []byte, 32)
-
-	var boxPub crypto.BoxPubKey
-	var sigPub crypto.SigPubKey
-	boxPubHex, err := hex.DecodeString(boxPubKey)
-	if err != nil {
-		c.log.Println(err)
-		return err
-	}
-	sigPubHex, err := hex.DecodeString(sigPubKey)
-	if err != nil {
-		c.log.Println(err)
-		return err
-	}
-	copy(boxPub[:], boxPubHex)
-	copy(sigPub[:], sigPubHex)
-
-	if intf, err := c.awdl.create(fromAWDL, toAWDL, &boxPub, &sigPub, name); err == nil {
-		if intf != nil {
-			c.log.Println(err)
-			return err
-		} else {
-			c.log.Println("c.awdl.create didn't return an interface")
-			return errors.New("c.awdl.create didn't return an interface")
-		}
-	} else {
-		c.log.Println(err)
-		return err
-	}
-}
-
-func (c *Core) AWDLCreateInterfaceFromContext(context []byte, name string) error {
-	if len(context) < crypto.BoxPubKeyLen+crypto.SigPubKeyLen {
-		return errors.New("Not enough bytes in context")
-	}
-	boxPubKey := hex.EncodeToString(context[:crypto.BoxPubKeyLen])
-	sigPubKey := hex.EncodeToString(context[crypto.BoxPubKeyLen:])
-	return c.AWDLCreateInterface(boxPubKey, sigPubKey, name)
-}
-
-func (c *Core) AWDLShutdownInterface(name string) error {
-	return c.awdl.shutdown(name)
-}
-
-func (c *Core) AWDLRecvPacket(identity string) ([]byte, error) {
-	if intf := c.awdl.getInterface(identity); intf != nil {
-		return <-intf.toAWDL, nil
-	}
-	return nil, errors.New("AWDLRecvPacket identity not known: " + identity)
-}
-
-func (c *Core) AWDLSendPacket(identity string, buf []byte) error {
-	packet := append(util.GetBytes(), buf[:]...)
-	if intf := c.awdl.getInterface(identity); intf != nil {
-		intf.fromAWDL <- packet
-		return nil
-	}
-	return errors.New("AWDLSendPacket identity not known: " + identity)
-}
-
-func (c *Core) AWDLConnectionContext() []byte {
-	var context []byte
-	context = append(context, c.boxPub[:]...)
-	context = append(context, c.sigPub[:]...)
-	return context
-}
diff --git a/src/yggdrasil/mobile_android.go b/src/yggdrasil/mobile_android.go
new file mode 100644
index 00000000..24764840
--- /dev/null
+++ b/src/yggdrasil/mobile_android.go
@@ -0,0 +1,12 @@
+// +build android
+
+package yggdrasil
+
+import "log"
+
+type MobileLogger struct{}
+
+func (nsl MobileLogger) Write(p []byte) (n int, err error) {
+	log.Println(string(p))
+	return len(p), nil
+}
diff --git a/src/yggdrasil/mobile_ios.go b/src/yggdrasil/mobile_ios.go
index 4abc6e9f..72920fe0 100644
--- a/src/yggdrasil/mobile_ios.go
+++ b/src/yggdrasil/mobile_ios.go
@@ -12,7 +12,12 @@ void Log(const char *text) {
 }
 */
 import "C"
-import "unsafe"
+import (
+	"errors"
+	"unsafe"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
 
 type MobileLogger struct {
 }
@@ -23,3 +28,41 @@ func (nsl MobileLogger) Write(p []byte) (n int, err error) {
 	C.Log(cstr)
 	return len(p), nil
 }
+
+func (c *Core) AWDLCreateInterface(name string) error {
+	fromAWDL := make(chan []byte, 32)
+	toAWDL := make(chan []byte, 32)
+
+	if intf, err := c.awdl.create(fromAWDL, toAWDL, name); err == nil {
+		if intf != nil {
+			c.log.Println(err)
+			return err
+		} else {
+			c.log.Println("c.awdl.create didn't return an interface")
+			return errors.New("c.awdl.create didn't return an interface")
+		}
+	} else {
+		c.log.Println(err)
+		return err
+	}
+}
+
+func (c *Core) AWDLShutdownInterface(name string) error {
+	return c.awdl.shutdown(name)
+}
+
+func (c *Core) AWDLRecvPacket(identity string) ([]byte, error) {
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		return <-intf.toAWDL, nil
+	}
+	return nil, errors.New("AWDLRecvPacket identity not known: " + identity)
+}
+
+func (c *Core) AWDLSendPacket(identity string, buf []byte) error {
+	packet := append(util.GetBytes(), buf[:]...)
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		intf.fromAWDL <- packet
+		return nil
+	}
+	return errors.New("AWDLSendPacket identity not known: " + identity)
+}
diff --git a/src/yggdrasil/multicast.go b/src/yggdrasil/multicast.go
index 749dfcdb..c0a676a8 100644
--- a/src/yggdrasil/multicast.go
+++ b/src/yggdrasil/multicast.go
@@ -157,6 +157,6 @@ func (m *multicast) listen() {
 		}
 		addr.Zone = from.Zone
 		saddr := addr.String()
-		m.core.tcp.connect(saddr, "")
+		m.core.tcp.connect(saddr, addr.Zone)
 	}
 }
diff --git a/src/yggdrasil/multicast_darwin.go b/src/yggdrasil/multicast_darwin.go
new file mode 100644
index 00000000..71eecce4
--- /dev/null
+++ b/src/yggdrasil/multicast_darwin.go
@@ -0,0 +1,28 @@
+// +build darwin
+
+package yggdrasil
+
+import "syscall"
+import "golang.org/x/sys/unix"
+
+func multicastReuse(network string, address string, c syscall.RawConn) error {
+	var control error
+	var reuseport error
+	var recvanyif error
+
+	control = c.Control(func(fd uintptr) {
+		reuseport = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
+
+		// sys/socket.h: #define	SO_RECV_ANYIF	0x1104
+		recvanyif = unix.SetsockoptInt(int(fd), syscall.SOL_SOCKET, 0x1104, 1)
+	})
+
+	switch {
+	case reuseport != nil:
+		return reuseport
+	case recvanyif != nil:
+		return recvanyif
+	default:
+		return control
+	}
+}
diff --git a/src/yggdrasil/multicast_unix.go b/src/yggdrasil/multicast_unix.go
index 9c6d1f11..54bbc645 100644
--- a/src/yggdrasil/multicast_unix.go
+++ b/src/yggdrasil/multicast_unix.go
@@ -1,4 +1,4 @@
-// +build linux darwin netbsd freebsd openbsd dragonflybsd
+// +build linux netbsd freebsd openbsd dragonflybsd
 
 package yggdrasil
 
diff --git a/src/yggdrasil/tcp.go b/src/yggdrasil/tcp.go
index 6d923440..8d8fee34 100644
--- a/src/yggdrasil/tcp.go
+++ b/src/yggdrasil/tcp.go
@@ -15,6 +15,7 @@ package yggdrasil
 //  See version.go for version metadata format
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"io"
@@ -88,7 +89,11 @@ func (iface *tcpInterface) init(core *Core, addr string, readTimeout int32) (err
 		iface.tcp_timeout = default_tcp_timeout
 	}
 
-	iface.serv, err = net.Listen("tcp", addr)
+	ctx := context.Background()
+	lc := net.ListenConfig{
+		Control: iface.tcpContext,
+	}
+	iface.serv, err = lc.Listen(ctx, "tcp", addr)
 	if err == nil {
 		iface.calls = make(map[string]struct{})
 		iface.conns = make(map[tcpInfo](chan struct{}))
@@ -164,7 +169,9 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string, sintf string) {
 				},
 			}
 		} else {
-			dialer := net.Dialer{}
+			dialer := net.Dialer{
+				Control: iface.tcpContext,
+			}
 			if sintf != "" {
 				ief, err := net.InterfaceByName(sintf)
 				if err != nil {
diff --git a/src/yggdrasil/tcp_darwin.go b/src/yggdrasil/tcp_darwin.go
new file mode 100644
index 00000000..6483ef86
--- /dev/null
+++ b/src/yggdrasil/tcp_darwin.go
@@ -0,0 +1,28 @@
+// +build darwin
+
+package yggdrasil
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+// WARNING: This context is used both by net.Dialer and net.Listen in tcp.go
+
+func (iface *tcpInterface) tcpContext(network, address string, c syscall.RawConn) error {
+	var control error
+	var recvanyif error
+
+	control = c.Control(func(fd uintptr) {
+		// sys/socket.h: #define	SO_RECV_ANYIF	0x1104
+		recvanyif = unix.SetsockoptInt(int(fd), syscall.SOL_SOCKET, 0x1104, 1)
+	})
+
+	switch {
+	case recvanyif != nil:
+		return recvanyif
+	default:
+		return control
+	}
+}
diff --git a/src/yggdrasil/tcp_other.go b/src/yggdrasil/tcp_other.go
new file mode 100644
index 00000000..5d62b530
--- /dev/null
+++ b/src/yggdrasil/tcp_other.go
@@ -0,0 +1,13 @@
+// +build !darwin
+
+package yggdrasil
+
+import (
+	"syscall"
+)
+
+// WARNING: This context is used both by net.Dialer and net.Listen in tcp.go
+
+func (iface *tcpInterface) tcpContext(network, address string, c syscall.RawConn) error {
+	return nil
+}