diff --git a/cmd/yggdrasil/main.go b/cmd/yggdrasil/main.go
index f11bbc0..f67bbce 100644
--- a/cmd/yggdrasil/main.go
+++ b/cmd/yggdrasil/main.go
@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"os"
 	"os/signal"
 	"strings"
@@ -14,6 +13,7 @@ import (
 
 	"golang.org/x/text/encoding/unicode"
 
+	"github.com/gologme/log"
 	"github.com/hjson/hjson-go"
 	"github.com/kardianos/minwinsvc"
 	"github.com/mitchellh/mapstructure"
@@ -169,6 +169,7 @@ func main() {
 	confjson := flag.Bool("json", false, "print configuration from -genconf or -normaliseconf as JSON instead of HJSON")
 	autoconf := flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)")
 	version := flag.Bool("version", false, "prints the version of this build")
+	logging := flag.String("logging", "info,warn,error", "comma-separated list of logging levels to enable")
 	flag.Parse()
 
 	var cfg *nodeConfig
@@ -217,6 +218,20 @@ func main() {
 	}
 	// Create a new logger that logs output to stdout.
 	logger := log.New(os.Stdout, "", log.Flags())
+	//logger.EnableLevel("error")
+	//logger.EnableLevel("warn")
+	//logger.EnableLevel("info")
+	if levels := strings.Split(*logging, ","); len(levels) > 0 {
+		for _, level := range levels {
+			l := strings.TrimSpace(level)
+			switch l {
+			case "error", "warn", "info", "trace", "debug":
+				logger.EnableLevel(l)
+			default:
+				continue
+			}
+		}
+	}
 	// Setup the Yggdrasil node itself. The node{} type includes a Core, so we
 	// don't need to create this manually.
 	n := node{}
@@ -224,7 +239,7 @@ func main() {
 	// Yggdrasil. This will start the router, switch, DHT node, TCP and UDP
 	// sockets, TUN/TAP adapter and multicast discovery port.
 	if err := n.core.Start(cfg, logger); err != nil {
-		logger.Println("An error occurred during startup")
+		logger.Errorln("An error occurred during startup")
 		panic(err)
 	}
 	// The Stop function ensures that the TUN/TAP adapter is correctly shut down
@@ -236,8 +251,8 @@ func main() {
 	// This is just logged to stdout for the user.
 	address := n.core.GetAddress()
 	subnet := n.core.GetSubnet()
-	logger.Printf("Your IPv6 address is %s", address.String())
-	logger.Printf("Your IPv6 subnet is %s", subnet.String())
+	logger.Infof("Your IPv6 address is %s", address.String())
+	logger.Infof("Your IPv6 subnet is %s", subnet.String())
 	// Catch interrupts from the operating system to exit gracefully.
 	c := make(chan os.Signal, 1)
 	r := make(chan os.Signal, 1)
@@ -257,7 +272,7 @@ func main() {
 				cfg = readConfig(useconf, useconffile, normaliseconf)
 				n.core.UpdateConfig(cfg)
 			} else {
-				logger.Println("Reloading config at runtime is only possible with -useconffile")
+				logger.Errorln("Reloading config at runtime is only possible with -useconffile")
 			}
 		case _ = <-c:
 			goto exit
diff --git a/go.mod b/go.mod
index 53a5a2b..3e8db51 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ require (
 	github.com/hjson/hjson-go v0.0.0-20181010104306-a25ecf6bd222
 	github.com/kardianos/minwinsvc v0.0.0-20151122163309-cad6b2b879b0
 	github.com/mitchellh/mapstructure v1.1.2
+	github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8
 	github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091
 	github.com/yggdrasil-network/water v0.0.0-20180615095340-f732c88f34ae
 	golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
diff --git a/go.sum b/go.sum
index 1695daf..17b1017 100644
--- a/go.sum
+++ b/go.sum
@@ -18,3 +18,5 @@ golang.org/x/sys v0.0.0-20181206074257-70b957f3b65e h1:njOxP/wVblhCLIUhjHXf6X+dz
 golang.org/x/sys v0.0.0-20181206074257-70b957f3b65e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8 h1:WD8iJ37bRNwvETMfVTusVSAi0WdXTpfNVGY2aHycNKY=
+github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8/go.mod h1:gq31gQ8wEHkR+WekdWsqDuf8pXTUZA9BnnzTuPz1Y9U=
diff --git a/src/yggdrasil/admin.go b/src/yggdrasil/admin.go
index f601776..b54ac5c 100644
--- a/src/yggdrasil/admin.go
+++ b/src/yggdrasil/admin.go
@@ -398,7 +398,7 @@ func (a *admin) listen() {
 		switch strings.ToLower(u.Scheme) {
 		case "unix":
 			if _, err := os.Stat(a.listenaddr[7:]); err == nil {
-				a.core.log.Println("WARNING:", a.listenaddr[7:], "already exists and may be in use by another process")
+				a.core.log.Warnln("WARNING:", a.listenaddr[7:], "already exists and may be in use by another process")
 			}
 			a.listener, err = net.Listen("unix", a.listenaddr[7:])
 			if err == nil {
@@ -406,7 +406,7 @@ func (a *admin) listen() {
 				case "@": // maybe abstract namespace
 				default:
 					if err := os.Chmod(a.listenaddr[7:], 0660); err != nil {
-						a.core.log.Println("WARNING:", a.listenaddr[:7], "may have unsafe permissions!")
+						a.core.log.Warnln("WARNING:", a.listenaddr[:7], "may have unsafe permissions!")
 					}
 				}
 			}
@@ -420,10 +420,10 @@ func (a *admin) listen() {
 		a.listener, err = net.Listen("tcp", a.listenaddr)
 	}
 	if err != nil {
-		a.core.log.Printf("Admin socket failed to listen: %v", err)
+		a.core.log.Errorf("Admin socket failed to listen: %v", err)
 		os.Exit(1)
 	}
-	a.core.log.Printf("%s admin socket listening on %s",
+	a.core.log.Infof("%s admin socket listening on %s",
 		strings.ToUpper(a.listener.Addr().Network()),
 		a.listener.Addr().String())
 	defer a.listener.Close()
@@ -450,9 +450,9 @@ func (a *admin) handleRequest(conn net.Conn) {
 				"status": "error",
 				"error":  "Unrecoverable error, possibly as a result of invalid input types or malformed syntax",
 			}
-			fmt.Println("Admin socket error:", r)
+			a.core.log.Errorln("Admin socket error:", r)
 			if err := encoder.Encode(&send); err != nil {
-				fmt.Println("Admin socket JSON encode error:", err)
+				a.core.log.Errorln("Admin socket JSON encode error:", err)
 			}
 			conn.Close()
 		}
diff --git a/src/yggdrasil/awdl.go b/src/yggdrasil/awdl.go
index 633d5f9..190d025 100644
--- a/src/yggdrasil/awdl.go
+++ b/src/yggdrasil/awdl.go
@@ -50,24 +50,24 @@ func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte /*boxPubKey *cryp
 	meta.sig = l.core.sigPub
 	meta.link = *myLinkPub
 	metaBytes := meta.encode()
-	l.core.log.Println("toAWDL <- metaBytes")
+	l.core.log.Traceln("toAWDL <- metaBytes")
 	toAWDL <- metaBytes
-	l.core.log.Println("metaBytes = <-fromAWDL")
+	l.core.log.Traceln("metaBytes = <-fromAWDL")
 	metaBytes = <-fromAWDL
-	l.core.log.Println("version_metadata{}")
+	l.core.log.Traceln("version_metadata{}")
 	meta = version_metadata{}
 	if !meta.decode(metaBytes) || !meta.check() {
 		return nil, errors.New("Metadata decode failure")
 	}
-	l.core.log.Println("version_getBaseMetadata{}")
+	l.core.log.Traceln("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")
+	l.core.log.Traceln("crypto.GetSharedKey")
 	shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
 	//shared := crypto.GetSharedKey(&l.core.boxPriv, boxPubKey)
-	l.core.log.Println("l.core.peers.newPeer")
+	l.core.log.Traceln("l.core.peers.newPeer")
 	intf.peer = l.core.peers.newPeer(&meta.box, &meta.sig, shared, name)
 	if intf.peer != nil {
 		intf.peer.linkOut = make(chan []byte, 1) // protocol traffic
diff --git a/src/yggdrasil/ckr.go b/src/yggdrasil/ckr.go
index a5ed455..03bc571 100644
--- a/src/yggdrasil/ckr.go
+++ b/src/yggdrasil/ckr.go
@@ -48,7 +48,7 @@ func (c *cryptokey) init(core *Core) {
 	}()
 
 	if err := c.configure(); err != nil {
-		c.core.log.Println("CKR configuration failed:", err)
+		c.core.log.Errorln("CKR configuration failed:", err)
 	}
 }
 
@@ -192,7 +192,7 @@ func (c *cryptokey) addSourceSubnet(cidr string) error {
 
 	// Add the source subnet
 	*routingsources = append(*routingsources, *ipnet)
-	c.core.log.Println("Added CKR source subnet", cidr)
+	c.core.log.Infoln("Added CKR source subnet", cidr)
 	return nil
 }
 
@@ -264,7 +264,7 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
 			delete(*routingcache, k)
 		}
 
-		c.core.log.Println("Added CKR destination subnet", cidr)
+		c.core.log.Infoln("Added CKR destination subnet", cidr)
 		return nil
 	}
 }
@@ -358,7 +358,7 @@ func (c *cryptokey) removeSourceSubnet(cidr string) error {
 	for idx, subnet := range *routingsources {
 		if subnet.String() == ipnet.String() {
 			*routingsources = append((*routingsources)[:idx], (*routingsources)[idx+1:]...)
-			c.core.log.Println("Removed CKR source subnet", cidr)
+			c.core.log.Infoln("Removed CKR source subnet", cidr)
 			return nil
 		}
 	}
@@ -407,7 +407,7 @@ func (c *cryptokey) removeRoute(cidr string, dest string) error {
 			for k := range *routingcache {
 				delete(*routingcache, k)
 			}
-			c.core.log.Printf("Removed CKR destination subnet %s via %s\n", cidr, dest)
+			c.core.log.Infoln("Removed CKR destination subnet %s via %s\n", cidr, dest)
 			return nil
 		}
 	}
diff --git a/src/yggdrasil/core.go b/src/yggdrasil/core.go
index ed07581..c78bc1f 100644
--- a/src/yggdrasil/core.go
+++ b/src/yggdrasil/core.go
@@ -3,11 +3,12 @@ package yggdrasil
 import (
 	"encoding/hex"
 	"io/ioutil"
-	"log"
 	"net"
 	"sync"
 	"time"
 
+	"github.com/gologme/log"
+
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
 	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
@@ -178,13 +179,13 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 	c.log = log
 
 	if name := GetBuildName(); name != "unknown" {
-		c.log.Println("Build name:", name)
+		c.log.Infoln("Build name:", name)
 	}
 	if version := GetBuildVersion(); version != "unknown" {
-		c.log.Println("Build version:", version)
+		c.log.Infoln("Build version:", version)
 	}
 
-	c.log.Println("Starting up...")
+	c.log.Infoln("Starting up...")
 
 	c.configMutex.Lock()
 	c.config = *nc
@@ -194,12 +195,12 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 	c.init()
 
 	if err := c.tcp.init(c); err != nil {
-		c.log.Println("Failed to start TCP interface")
+		c.log.Errorln("Failed to start TCP interface")
 		return err
 	}
 
 	if err := c.awdl.init(c); err != nil {
-		c.log.Println("Failed to start AWDL interface")
+		c.log.Errorln("Failed to start AWDL interface")
 		return err
 	}
 
@@ -208,39 +209,39 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 	}
 
 	if err := c.switchTable.start(); err != nil {
-		c.log.Println("Failed to start switch")
+		c.log.Errorln("Failed to start switch")
 		return err
 	}
 
 	if err := c.router.start(); err != nil {
-		c.log.Println("Failed to start router")
+		c.log.Errorln("Failed to start router")
 		return err
 	}
 
 	if err := c.admin.start(); err != nil {
-		c.log.Println("Failed to start admin socket")
+		c.log.Errorln("Failed to start admin socket")
 		return err
 	}
 
 	if err := c.multicast.start(); err != nil {
-		c.log.Println("Failed to start multicast interface")
+		c.log.Errorln("Failed to start multicast interface")
 		return err
 	}
 
 	if err := c.router.tun.start(); err != nil {
-		c.log.Println("Failed to start TUN/TAP")
+		c.log.Errorln("Failed to start TUN/TAP")
 		return err
 	}
 
 	go c.addPeerLoop()
 
-	c.log.Println("Startup complete")
+	c.log.Infoln("Startup complete")
 	return nil
 }
 
 // Stops the Yggdrasil node.
 func (c *Core) Stop() {
-	c.log.Println("Stopping...")
+	c.log.Infoln("Stopping...")
 	c.router.tun.close()
 	c.admin.close()
 }
diff --git a/src/yggdrasil/mobile.go b/src/yggdrasil/mobile.go
index 2ffeffb..220e6ca 100644
--- a/src/yggdrasil/mobile.go
+++ b/src/yggdrasil/mobile.go
@@ -77,9 +77,7 @@ 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)
diff --git a/src/yggdrasil/multicast.go b/src/yggdrasil/multicast.go
index 08f0954..42651de 100644
--- a/src/yggdrasil/multicast.go
+++ b/src/yggdrasil/multicast.go
@@ -35,15 +35,15 @@ func (m *multicast) init(core *Core) {
 	m.groupAddr = "[ff02::114]:9001"
 	// Check if we've been given any expressions
 	if count := len(m.interfaces()); count != 0 {
-		m.core.log.Println("Found", count, "multicast interface(s)")
+		m.core.log.Infoln("Found", count, "multicast interface(s)")
 	}
 }
 
 func (m *multicast) start() error {
 	if len(m.interfaces()) == 0 {
-		m.core.log.Println("Multicast discovery is disabled")
+		m.core.log.Infoln("Multicast discovery is disabled")
 	} else {
-		m.core.log.Println("Multicast discovery is enabled")
+		m.core.log.Infoln("Multicast discovery is enabled")
 		addr, err := net.ResolveUDPAddr("udp", m.groupAddr)
 		if err != nil {
 			return err
diff --git a/src/yggdrasil/router.go b/src/yggdrasil/router.go
index 31eefbb..d505936 100644
--- a/src/yggdrasil/router.go
+++ b/src/yggdrasil/router.go
@@ -96,7 +96,7 @@ func (r *router) init(core *Core) {
 
 // Starts the mainLoop goroutine.
 func (r *router) start() error {
-	r.core.log.Println("Starting router")
+	r.core.log.Infoln("Starting router")
 	go r.mainLoop()
 	return nil
 }
diff --git a/src/yggdrasil/switch.go b/src/yggdrasil/switch.go
index 2a4e7e4..f2adf3f 100644
--- a/src/yggdrasil/switch.go
+++ b/src/yggdrasil/switch.go
@@ -563,7 +563,7 @@ func (t *switchTable) getTable() lookupTable {
 
 // Starts the switch worker
 func (t *switchTable) start() error {
-	t.core.log.Println("Starting switch")
+	t.core.log.Infoln("Starting switch")
 	go t.doWorker()
 	return nil
 }
diff --git a/src/yggdrasil/tcp.go b/src/yggdrasil/tcp.go
index 78e39ef..a83213d 100644
--- a/src/yggdrasil/tcp.go
+++ b/src/yggdrasil/tcp.go
@@ -139,16 +139,16 @@ func (iface *tcpInterface) listen() error {
 // Runs the listener, which spawns off goroutines for incoming connections.
 func (iface *tcpInterface) listener() {
 	defer iface.serv.Close()
-	iface.core.log.Println("Listening for TCP on:", iface.serv.Addr().String())
+	iface.core.log.Infoln("Listening for TCP on:", iface.serv.Addr().String())
 	for {
 		sock, err := iface.serv.Accept()
 		if err != nil {
-			iface.core.log.Println("Failed to accept connection:", err)
+			iface.core.log.Errorln("Failed to accept connection:", err)
 			return
 		}
 		select {
 		case <-iface.serv_stop:
-			iface.core.log.Println("Stopping listener")
+			iface.core.log.Errorln("Stopping listener")
 			return
 		default:
 			if err != nil {
@@ -313,9 +313,9 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 		base := version_getBaseMetadata()
 		if meta.meta == base.meta {
 			if meta.ver > base.ver {
-				iface.core.log.Println("Failed to connect to node:", sock.RemoteAddr().String(), "version:", meta.ver)
+				iface.core.log.Errorln("Failed to connect to node:", sock.RemoteAddr().String(), "version:", meta.ver)
 			} else if meta.ver == base.ver && meta.minorVer > base.minorVer {
-				iface.core.log.Println("Failed to connect to node:", sock.RemoteAddr().String(), "version:", fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
+				iface.core.log.Errorln("Failed to connect to node:", sock.RemoteAddr().String(), "version:", fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
 			}
 		}
 		// TODO? Block forever to prevent future connection attempts? suppress future messages about the same node?
@@ -444,12 +444,12 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	themAddr := address.AddrForNodeID(themNodeID)
 	themAddrString := net.IP(themAddr[:]).String()
 	themString := fmt.Sprintf("%s@%s", themAddrString, them)
-	iface.core.log.Printf("Connected: %s, source: %s", themString, us)
+	iface.core.log.Infof("Connected: %s, source: %s", themString, us)
 	err = iface.reader(sock, in) // In this goroutine, because of defers
 	if err == nil {
-		iface.core.log.Printf("Disconnected: %s, source: %s", themString, us)
+		iface.core.log.Infof("Disconnected: %s, source: %s", themString, us)
 	} else {
-		iface.core.log.Printf("Disconnected: %s, source: %s, error: %s", themString, us, err)
+		iface.core.log.Infof("Disconnected: %s, source: %s, error: %s", themString, us, err)
 	}
 	return
 }
diff --git a/src/yggdrasil/tun.go b/src/yggdrasil/tun.go
index c0a7139..465cbb1 100644
--- a/src/yggdrasil/tun.go
+++ b/src/yggdrasil/tun.go
@@ -53,7 +53,7 @@ func (tun *tunAdapter) init(core *Core, send chan<- []byte, recv <-chan []byte)
 				tun.core.config.IfMTU != tun.core.configOld.IfMTU
 			tun.core.configMutex.RUnlock()
 			if updated {
-				tun.core.log.Println("Reconfiguring TUN/TAP is not supported yet")
+				tun.core.log.Warnln("Reconfiguring TUN/TAP is not supported yet")
 				e <- nil
 			} else {
 				e <- nil
@@ -82,8 +82,8 @@ func (tun *tunAdapter) start() error {
 	tun.mutex.Lock()
 	tun.isOpen = true
 	tun.mutex.Unlock()
-	go func() { tun.core.log.Println("WARNING: tun.read() exited with error:", tun.read()) }()
-	go func() { tun.core.log.Println("WARNING: tun.write() exited with error:", tun.write()) }()
+	go func() { tun.core.log.Errorln("WARNING: tun.read() exited with error:", tun.read()) }()
+	go func() { tun.core.log.Errorln("WARNING: tun.write() exited with error:", tun.write()) }()
 	if iftapmode {
 		go func() {
 			for {
diff --git a/src/yggdrasil/tun_bsd.go b/src/yggdrasil/tun_bsd.go
index 620c79d..81e2c46 100644
--- a/src/yggdrasil/tun_bsd.go
+++ b/src/yggdrasil/tun_bsd.go
@@ -114,9 +114,9 @@ func (tun *tunAdapter) setupAddress(addr string) error {
 	}
 
 	// Friendly output
-	tun.core.log.Printf("Interface name: %s", tun.iface.Name())
-	tun.core.log.Printf("Interface IPv6: %s", addr)
-	tun.core.log.Printf("Interface MTU: %d", tun.mtu)
+	tun.core.log.Infof("Interface name: %s", tun.iface.Name())
+	tun.core.log.Infof("Interface IPv6: %s", addr)
+	tun.core.log.Infof("Interface MTU: %d", tun.mtu)
 
 	// Create the MTU request
 	var ir in6_ifreq_mtu
@@ -126,15 +126,15 @@ func (tun *tunAdapter) setupAddress(addr string) error {
 	// Set the MTU
 	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
 		err = errno
-		tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
+		tun.core.log.Errorf("Error in SIOCSIFMTU: %v", errno)
 
 		// Fall back to ifconfig to set the MTU
 		cmd := exec.Command("ifconfig", tun.iface.Name(), "mtu", string(tun.mtu))
-		tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
+		tun.core.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
 		output, err := cmd.CombinedOutput()
 		if err != nil {
-			tun.core.log.Printf("SIOCSIFMTU fallback failed: %v.", err)
-			tun.core.log.Println(string(output))
+			tun.core.log.Errorf("SIOCSIFMTU fallback failed: %v.", err)
+			tun.core.log.Traceln(string(output))
 		}
 	}
 
@@ -155,15 +155,15 @@ func (tun *tunAdapter) setupAddress(addr string) error {
 	// Set the interface address
 	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
 		err = errno
-		tun.core.log.Printf("Error in SIOCSIFADDR_IN6: %v", errno)
+		tun.core.log.Errorf("Error in SIOCSIFADDR_IN6: %v", errno)
 
 		// Fall back to ifconfig to set the address
 		cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
-		tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
+		tun.core.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
 		output, err := cmd.CombinedOutput()
 		if err != nil {
-			tun.core.log.Printf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
-			tun.core.log.Println(string(output))
+			tun.core.log.Errorf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
+			tun.core.log.Traceln(string(output))
 		}
 	}
 
diff --git a/src/yggdrasil/tun_darwin.go b/src/yggdrasil/tun_darwin.go
index 828c01e..7ec1b8b 100644
--- a/src/yggdrasil/tun_darwin.go
+++ b/src/yggdrasil/tun_darwin.go
@@ -18,7 +18,7 @@ import (
 // Configures the "utun" adapter with the correct IPv6 address and MTU.
 func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	if iftapmode {
-		tun.core.log.Printf("TAP mode is not supported on this platform, defaulting to TUN")
+		tun.core.log.Warnln("TAP mode is not supported on this platform, defaulting to TUN")
 	}
 	config := water.Config{DeviceType: water.TUN}
 	iface, err := water.New(config)
@@ -98,19 +98,19 @@ func (tun *tunAdapter) setupAddress(addr string) error {
 	copy(ir.ifr_name[:], tun.iface.Name())
 	ir.ifru_mtu = uint32(tun.mtu)
 
-	tun.core.log.Printf("Interface name: %s", ar.ifra_name)
-	tun.core.log.Printf("Interface IPv6: %s", addr)
-	tun.core.log.Printf("Interface MTU: %d", ir.ifru_mtu)
+	tun.core.log.Infof("Interface name: %s", ar.ifra_name)
+	tun.core.log.Infof("Interface IPv6: %s", addr)
+	tun.core.log.Infof("Interface MTU: %d", ir.ifru_mtu)
 
 	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(darwin_SIOCAIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
 		err = errno
-		tun.core.log.Printf("Error in darwin_SIOCAIFADDR_IN6: %v", errno)
+		tun.core.log.Errorf("Error in darwin_SIOCAIFADDR_IN6: %v", errno)
 		return err
 	}
 
 	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
 		err = errno
-		tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
+		tun.core.log.Errorf("Error in SIOCSIFMTU: %v", errno)
 		return err
 	}
 
diff --git a/src/yggdrasil/tun_linux.go b/src/yggdrasil/tun_linux.go
index 8ccdd30..30ada23 100644
--- a/src/yggdrasil/tun_linux.go
+++ b/src/yggdrasil/tun_linux.go
@@ -40,9 +40,9 @@ func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int
 		}
 	}
 	// Friendly output
-	tun.core.log.Printf("Interface name: %s", tun.iface.Name())
-	tun.core.log.Printf("Interface IPv6: %s", addr)
-	tun.core.log.Printf("Interface MTU: %d", tun.mtu)
+	tun.core.log.Infof("Interface name: %s", tun.iface.Name())
+	tun.core.log.Infof("Interface IPv6: %s", addr)
+	tun.core.log.Infof("Interface MTU: %d", tun.mtu)
 	return tun.setupAddress(addr)
 }
 
diff --git a/src/yggdrasil/tun_other.go b/src/yggdrasil/tun_other.go
index 22058c1..07ec25f 100644
--- a/src/yggdrasil/tun_other.go
+++ b/src/yggdrasil/tun_other.go
@@ -28,6 +28,6 @@ func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int
 // We don't know how to set the IPv6 address on an unknown platform, therefore
 // write about it to stdout and don't try to do anything further.
 func (tun *tunAdapter) setupAddress(addr string) error {
-	tun.core.log.Println("Platform not supported, you must set the address of", tun.iface.Name(), "to", addr)
+	tun.core.log.Warnln("Platform not supported, you must set the address of", tun.iface.Name(), "to", addr)
 	return nil
 }
diff --git a/src/yggdrasil/tun_windows.go b/src/yggdrasil/tun_windows.go
index 150a976..1c89a43 100644
--- a/src/yggdrasil/tun_windows.go
+++ b/src/yggdrasil/tun_windows.go
@@ -15,7 +15,7 @@ import (
 // delegate the hard work to "netsh".
 func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	if !iftapmode {
-		tun.core.log.Printf("TUN mode is not supported on this platform, defaulting to TAP")
+		tun.core.log.Warnln("TUN mode is not supported on this platform, defaulting to TAP")
 	}
 	config := water.Config{DeviceType: water.TAP}
 	config.PlatformSpecificParams.ComponentID = "tap0901"
@@ -34,16 +34,16 @@ func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int
 	tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
 	output, err := cmd.CombinedOutput()
 	if err != nil {
-		tun.core.log.Printf("Windows netsh failed: %v.", err)
-		tun.core.log.Println(string(output))
+		tun.core.log.Errorf("Windows netsh failed: %v.", err)
+		tun.core.log.Traceln(string(output))
 		return err
 	}
 	cmd = exec.Command("netsh", "interface", "set", "interface", iface.Name(), "admin=ENABLED")
 	tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
 	output, err = cmd.CombinedOutput()
 	if err != nil {
-		tun.core.log.Printf("Windows netsh failed: %v.", err)
-		tun.core.log.Println(string(output))
+		tun.core.log.Errorf("Windows netsh failed: %v.", err)
+		tun.core.log.Traceln(string(output))
 		return err
 	}
 	// Get a new iface
@@ -58,9 +58,9 @@ func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int
 		panic(err)
 	}
 	// Friendly output
-	tun.core.log.Printf("Interface name: %s", tun.iface.Name())
-	tun.core.log.Printf("Interface IPv6: %s", addr)
-	tun.core.log.Printf("Interface MTU: %d", tun.mtu)
+	tun.core.log.Infof("Interface name: %s", tun.iface.Name())
+	tun.core.log.Infof("Interface IPv6: %s", addr)
+	tun.core.log.Infof("Interface MTU: %d", tun.mtu)
 	return tun.setupAddress(addr)
 }
 
@@ -71,11 +71,11 @@ func (tun *tunAdapter) setupMTU(mtu int) error {
 		fmt.Sprintf("interface=%s", tun.iface.Name()),
 		fmt.Sprintf("mtu=%d", mtu),
 		"store=active")
-	tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
+	tun.core.log.Debugln("netsh command: %v", strings.Join(cmd.Args, " "))
 	output, err := cmd.CombinedOutput()
 	if err != nil {
-		tun.core.log.Printf("Windows netsh failed: %v.", err)
-		tun.core.log.Println(string(output))
+		tun.core.log.Errorf("Windows netsh failed: %v.", err)
+		tun.core.log.Traceln(string(output))
 		return err
 	}
 	return nil
@@ -88,11 +88,11 @@ func (tun *tunAdapter) setupAddress(addr string) error {
 		fmt.Sprintf("interface=%s", tun.iface.Name()),
 		fmt.Sprintf("addr=%s", addr),
 		"store=active")
-	tun.core.log.Printf("netsh command: %v", strings.Join(cmd.Args, " "))
+	tun.core.log.Debugln("netsh command: %v", strings.Join(cmd.Args, " "))
 	output, err := cmd.CombinedOutput()
 	if err != nil {
-		tun.core.log.Printf("Windows netsh failed: %v.", err)
-		tun.core.log.Println(string(output))
+		tun.core.log.Errorf("Windows netsh failed: %v.", err)
+		tun.core.log.Traceln(string(output))
 		return err
 	}
 	return nil