diff --git a/src/yggdrasil/admin.go b/src/yggdrasil/admin.go
index fe9c05e..1abf7a2 100644
--- a/src/yggdrasil/admin.go
+++ b/src/yggdrasil/admin.go
@@ -361,8 +361,6 @@ func (a *admin) addPeer(addr string) error {
 		switch strings.ToLower(u.Scheme) {
 		case "tcp":
 			a.core.tcp.connect(u.Host)
-		case "udp":
-			a.core.udp.connect(u.Host)
 		case "socks":
 			a.core.tcp.connectSOCKS(u.Host, u.Path[1:])
 		default:
@@ -371,17 +369,11 @@ func (a *admin) addPeer(addr string) error {
 	} else {
 		// no url scheme provided
 		addr = strings.ToLower(addr)
-		if strings.HasPrefix(addr, "udp:") {
-			a.core.udp.connect(addr[4:])
-			return nil
-		} else {
-			if strings.HasPrefix(addr, "tcp:") {
-				addr = addr[4:]
-			}
-			a.core.tcp.connect(addr)
-			return nil
+		if strings.HasPrefix(addr, "tcp:") {
+			addr = addr[4:]
 		}
-		return errors.New("invalid peer: " + addr)
+		a.core.tcp.connect(addr)
+		return nil
 	}
 	return nil
 }
diff --git a/src/yggdrasil/core.go b/src/yggdrasil/core.go
index ff9c360..b94d154 100644
--- a/src/yggdrasil/core.go
+++ b/src/yggdrasil/core.go
@@ -27,7 +27,6 @@ type Core struct {
 	searches    searches
 	multicast   multicast
 	tcp         tcpInterface
-	udp         udpInterface
 	log         *log.Logger
 	ifceExpr    []*regexp.Regexp // the zone of link-local IPv6 peers must match this
 }
@@ -99,11 +98,6 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 		return err
 	}
 
-	if err := c.udp.init(c, nc.Listen); err != nil {
-		c.log.Println("Failed to start UDP interface")
-		return err
-	}
-
 	if err := c.router.start(); err != nil {
 		c.log.Println("Failed to start router")
 		return err
diff --git a/src/yggdrasil/debug.go b/src/yggdrasil/debug.go
index a987fbd..cd42560 100644
--- a/src/yggdrasil/debug.go
+++ b/src/yggdrasil/debug.go
@@ -317,6 +317,7 @@ func (c *Core) DEBUG_init(bpub []byte,
 
 ////////////////////////////////////////////////////////////////////////////////
 
+/*
 func (c *Core) DEBUG_setupAndStartGlobalUDPInterface(addrport string) {
 	if err := c.udp.init(c, addrport); err != nil {
 		c.log.Println("Failed to start UDP interface:", err)
@@ -342,6 +343,7 @@ func (c *Core) DEBUG_maybeSendUDPKeys(saddr string) {
 		c.udp.sendKeys(addr)
 	}
 }
+*/
 
 ////////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/yggdrasil/udp.go b/src/yggdrasil/udp.go
deleted file mode 100644
index 0be507f..0000000
--- a/src/yggdrasil/udp.go
+++ /dev/null
@@ -1,394 +0,0 @@
-package yggdrasil
-
-// This communicates with peers via UDP
-// It's not as well tested or debugged as the TCP transport
-// It's intended to use UDP, so debugging/optimzing this is a high priority
-// TODO? use golang.org/x/net/ipv6.PacketConn's ReadBatch and WriteBatch?
-//  To send all chunks of a message / recv all available chunks in one syscall
-//  That might be faster on supported platforms, but it needs investigation
-// Chunks are currently murged, but outgoing messages aren't chunked
-// This is just to support chunking in the future, if it's needed and debugged
-//  Basically, right now we might send UDP packets that are too large
-
-// TODO remove old/unused code and better document live code
-
-import "net"
-import "time"
-import "sync"
-import "fmt"
-
-type udpInterface struct {
-	core  *Core
-	sock  *net.UDPConn // Or more general PacketConn?
-	mutex sync.RWMutex // each conn has an owner goroutine
-	conns map[connAddr]*connInfo
-}
-
-type connAddr struct {
-	ip   [16]byte
-	port int
-	zone string
-}
-
-func (c *connAddr) fromUDPAddr(u *net.UDPAddr) {
-	copy(c.ip[:], u.IP.To16())
-	c.port = u.Port
-	c.zone = u.Zone
-}
-
-func (c *connAddr) toUDPAddr() *net.UDPAddr {
-	var u net.UDPAddr
-	u.IP = make([]byte, 16)
-	copy(u.IP, c.ip[:])
-	u.Port = c.port
-	u.Zone = c.zone
-	return &u
-}
-
-type connInfo struct {
-	name      string
-	addr      connAddr
-	peer      *peer
-	linkIn    chan []byte
-	keysIn    chan *udpKeys
-	closeIn   chan *udpKeys
-	timeout   int // count of how many heartbeats have been missed
-	in        func([]byte)
-	out       chan []byte
-	countIn   uint8
-	countOut  uint8
-	chunkSize uint16
-}
-
-type udpKeys struct {
-	box boxPubKey
-	sig sigPubKey
-}
-
-func (iface *udpInterface) getAddr() *net.UDPAddr {
-	return iface.sock.LocalAddr().(*net.UDPAddr)
-}
-
-func (iface *udpInterface) connect(saddr string) {
-	udpAddr, err := net.ResolveUDPAddr("udp", saddr)
-	if err != nil {
-		panic(err)
-	}
-	var addr connAddr
-	addr.fromUDPAddr(udpAddr)
-	iface.mutex.RLock()
-	_, isIn := iface.conns[addr]
-	iface.mutex.RUnlock()
-	if !isIn {
-		iface.sendKeys(addr)
-	}
-}
-
-func (iface *udpInterface) init(core *Core, addr string) (err error) {
-	iface.core = core
-	udpAddr, err := net.ResolveUDPAddr("udp", addr)
-	if err != nil {
-		return
-	}
-	iface.sock, err = net.ListenUDP("udp", udpAddr)
-	if err != nil {
-		return
-	}
-	iface.conns = make(map[connAddr]*connInfo)
-	go iface.reader()
-	return
-}
-
-func (iface *udpInterface) sendKeys(addr connAddr) {
-	udpAddr := addr.toUDPAddr()
-	msg := []byte{}
-	msg = udp_encode(msg, 0, 0, 0, nil)
-	msg = append(msg, iface.core.boxPub[:]...)
-	msg = append(msg, iface.core.sigPub[:]...)
-	iface.sock.WriteToUDP(msg, udpAddr)
-}
-
-func (iface *udpInterface) sendClose(addr connAddr) {
-	udpAddr := addr.toUDPAddr()
-	msg := []byte{}
-	msg = udp_encode(msg, 0, 1, 0, nil)
-	msg = append(msg, iface.core.boxPub[:]...)
-	msg = append(msg, iface.core.sigPub[:]...)
-	iface.sock.WriteToUDP(msg, udpAddr)
-}
-
-func udp_isKeys(msg []byte) bool {
-	keyLen := 3 + boxPubKeyLen + sigPubKeyLen
-	return len(msg) == keyLen && msg[0] == 0x00 && msg[1] == 0x00
-}
-
-func udp_isClose(msg []byte) bool {
-	keyLen := 3 + boxPubKeyLen + sigPubKeyLen
-	return len(msg) == keyLen && msg[0] == 0x00 && msg[1] == 0x01
-}
-
-func (iface *udpInterface) startConn(info *connInfo) {
-	ticker := time.NewTicker(6 * time.Second)
-	defer ticker.Stop()
-	defer func() {
-		// Cleanup
-		iface.mutex.Lock()
-		delete(iface.conns, info.addr)
-		iface.mutex.Unlock()
-		iface.core.peers.removePeer(info.peer.port)
-		close(info.linkIn)
-		close(info.keysIn)
-		close(info.closeIn)
-		close(info.out)
-		iface.core.log.Println("Removing peer:", info.name)
-	}()
-	for {
-		select {
-		case ks := <-info.closeIn:
-			{
-				if ks.box == info.peer.box && ks.sig == info.peer.sig {
-					// TODO? secure this somehow
-					//  Maybe add a signature and sequence number (timestamp) to close and keys?
-					return
-				}
-			}
-		case ks := <-info.keysIn:
-			{
-				// FIXME? need signatures/sequence-numbers or something
-				// Spoofers could lock out a peer with fake/bad keys
-				if ks.box == info.peer.box && ks.sig == info.peer.sig {
-					info.timeout = 0
-				}
-			}
-		case <-ticker.C:
-			{
-				if info.timeout > 10 {
-					return
-				}
-				info.timeout++
-				iface.sendKeys(info.addr)
-			}
-		}
-	}
-}
-
-func (iface *udpInterface) handleClose(msg []byte, addr connAddr) {
-	//defer util_putBytes(msg)
-	var ks udpKeys
-	_, _, _, bs := udp_decode(msg)
-	switch {
-	case !wire_chop_slice(ks.box[:], &bs):
-		return
-	case !wire_chop_slice(ks.sig[:], &bs):
-		return
-	}
-	if ks.box == iface.core.boxPub {
-		return
-	}
-	if ks.sig == iface.core.sigPub {
-		return
-	}
-	iface.mutex.RLock()
-	conn, isIn := iface.conns[addr]
-	iface.mutex.RUnlock()
-	if !isIn {
-		return
-	}
-	func() {
-		defer func() { recover() }()
-		select {
-		case conn.closeIn <- &ks:
-		default:
-		}
-	}()
-}
-
-func (iface *udpInterface) handleKeys(msg []byte, addr connAddr) {
-	//defer util_putBytes(msg)
-	var ks udpKeys
-	_, _, _, bs := udp_decode(msg)
-	switch {
-	case !wire_chop_slice(ks.box[:], &bs):
-		return
-	case !wire_chop_slice(ks.sig[:], &bs):
-		return
-	}
-	if ks.box == iface.core.boxPub {
-		return
-	}
-	if ks.sig == iface.core.sigPub {
-		return
-	}
-	iface.mutex.RLock()
-	conn, isIn := iface.conns[addr]
-	iface.mutex.RUnlock()
-	if !isIn {
-		udpAddr := addr.toUDPAddr()
-		// Check if we're authorized to connect to this key / IP
-		// TODO monitor and always allow outgoing connections
-		if !iface.core.peers.isAllowedEncryptionPublicKey(&ks.box) {
-			// Allow unauthorized peers if they're link-local
-			if !udpAddr.IP.IsLinkLocalUnicast() {
-				return
-			}
-		}
-		themNodeID := getNodeID(&ks.box)
-		themAddr := address_addrForNodeID(themNodeID)
-		themAddrString := net.IP(themAddr[:]).String()
-		themString := fmt.Sprintf("%s@%s", themAddrString, udpAddr.String())
-		conn = &connInfo{
-			name:      themString,
-			addr:      connAddr(addr),
-			peer:      iface.core.peers.newPeer(&ks.box, &ks.sig),
-			linkIn:    make(chan []byte, 1),
-			keysIn:    make(chan *udpKeys, 1),
-			closeIn:   make(chan *udpKeys, 1),
-			out:       make(chan []byte, 32),
-			chunkSize: 576 - 60 - 8 - 3, // max safe - max ip - udp header - chunk overhead
-		}
-		if udpAddr.IP.IsLinkLocalUnicast() {
-			ifce, err := net.InterfaceByName(udpAddr.Zone)
-			if ifce != nil && err == nil {
-				conn.chunkSize = uint16(ifce.MTU) - 60 - 8 - 3
-			}
-		}
-		var inChunks uint8
-		var inBuf []byte
-		conn.in = func(bs []byte) {
-			//defer util_putBytes(bs)
-			chunks, chunk, count, payload := udp_decode(bs)
-			if count != conn.countIn {
-				if len(inBuf) > 0 {
-					// Something went wrong
-					// Forward whatever we have
-					// Maybe the destination can do something about it
-					msg := append(util_getBytes(), inBuf...)
-					conn.peer.handlePacket(msg, conn.linkIn)
-				}
-				inChunks = 0
-				inBuf = inBuf[:0]
-				conn.countIn = count
-			}
-			if chunk <= chunks && chunk == inChunks+1 {
-				inChunks += 1
-				inBuf = append(inBuf, payload...)
-				if chunks != chunk {
-					return
-				}
-				msg := append(util_getBytes(), inBuf...)
-				conn.peer.handlePacket(msg, conn.linkIn)
-				inBuf = inBuf[:0]
-			}
-		}
-		conn.peer.out = func(msg []byte) {
-			defer func() { recover() }()
-			select {
-			case conn.out <- msg:
-			default:
-				util_putBytes(msg)
-			}
-		}
-		go func() {
-			var out []byte
-			var chunks [][]byte
-			for msg := range conn.out {
-				chunks = chunks[:0]
-				bs := msg
-				for len(bs) > int(conn.chunkSize) {
-					chunks, bs = append(chunks, bs[:conn.chunkSize]), bs[conn.chunkSize:]
-				}
-				chunks = append(chunks, bs)
-				if len(chunks) > 255 {
-					continue
-				}
-				start := time.Now()
-				for idx, bs := range chunks {
-					nChunks, nChunk, count := uint8(len(chunks)), uint8(idx)+1, conn.countOut
-					out = udp_encode(out[:0], nChunks, nChunk, count, bs)
-					//iface.core.log.Println("DEBUG out:", nChunks, nChunk, count, len(bs))
-					iface.sock.WriteToUDP(out, udpAddr)
-				}
-				timed := time.Since(start)
-				conn.countOut += 1
-				conn.peer.updateBandwidth(len(msg), timed)
-				util_putBytes(msg)
-			}
-		}()
-		//*/
-		conn.peer.close = func() { iface.sendClose(conn.addr) }
-		iface.mutex.Lock()
-		iface.conns[addr] = conn
-		iface.mutex.Unlock()
-		iface.core.log.Println("Adding peer:", conn.name)
-		go iface.startConn(conn)
-		go conn.peer.linkLoop(conn.linkIn)
-		iface.sendKeys(conn.addr)
-	}
-	func() {
-		defer func() { recover() }()
-		select {
-		case conn.keysIn <- &ks:
-		default:
-		}
-	}()
-}
-
-func (iface *udpInterface) handlePacket(msg []byte, addr connAddr) {
-	iface.mutex.RLock()
-	if conn, isIn := iface.conns[addr]; isIn {
-		conn.in(msg)
-	}
-	iface.mutex.RUnlock()
-}
-
-func (iface *udpInterface) reader() {
-	iface.core.log.Println("Listening for UDP on:", iface.sock.LocalAddr().String())
-	bs := make([]byte, 65536) // This needs to be large enough for everything...
-	for {
-		n, udpAddr, err := iface.sock.ReadFromUDP(bs)
-		//iface.core.log.Println("DEBUG: read:", bs[0], bs[1], bs[2], n)
-		if err != nil {
-			panic(err)
-			break
-		}
-		msg := bs[:n]
-		var addr connAddr
-		addr.fromUDPAddr(udpAddr)
-		switch {
-		case udp_isKeys(msg):
-			var them address
-			copy(them[:], udpAddr.IP.To16())
-			if them.isValid() {
-				continue
-			}
-			if udpAddr.IP.IsLinkLocalUnicast() {
-				if len(iface.core.ifceExpr) == 0 {
-					break
-				}
-				for _, expr := range iface.core.ifceExpr {
-					if expr.MatchString(udpAddr.Zone) {
-						iface.handleKeys(msg, addr)
-						break
-					}
-				}
-			}
-		case udp_isClose(msg):
-			iface.handleClose(msg, addr)
-		default:
-			iface.handlePacket(msg, addr)
-		}
-	}
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-func udp_decode(bs []byte) (chunks, chunk, count uint8, payload []byte) {
-	if len(bs) >= 3 {
-		chunks, chunk, count, payload = bs[0], bs[1], bs[2], bs[3:]
-	}
-	return
-}
-
-func udp_encode(out []byte, chunks, chunk, count uint8, payload []byte) []byte {
-	return append(append(out, chunks, chunk, count), payload...)
-}