diff --git a/core/vpn/engine/engine.go b/core/vpn/engine/engine.go
new file mode 100644
index 0000000..68900b0
--- /dev/null
+++ b/core/vpn/engine/engine.go
@@ -0,0 +1,24 @@
+package engine
+
+import (
+	"inet.af/netaddr"
+	"tailscale.com/ipn/ipnstate"
+
+	"github.com/giolekva/pcloud/core/vpn/types"
+)
+
+// Abstracts away communication with host OS needed to setup netfwork interfaces
+// for VPN.
+type Engine interface {
+	// Reconfigures local network interfaces in accordance to the given VPN
+	// layout.
+	Configure(netMap *types.NetworkMap) error
+	// Unique public discovery key of the current device.
+	DiscoKey() types.DiscoKey
+	// Unique public endpoint of the given device.
+	// Communication between devices happen throughs such endpoints
+	// instead of IP addresses.
+	DiscoEndpoint() string
+	// Sends ping to the given IP address and invokes callback with results.
+	Ping(ip netaddr.IP, cb func(*ipnstate.PingResult))
+}
diff --git a/core/vpn/engine/wireguard.go b/core/vpn/engine/wireguard.go
new file mode 100644
index 0000000..3dbf717
--- /dev/null
+++ b/core/vpn/engine/wireguard.go
@@ -0,0 +1,168 @@
+package engine
+
+import (
+	"encoding/hex"
+	"fmt"
+	"log"
+
+	"github.com/giolekva/pcloud/core/vpn/types"
+
+	"github.com/tailscale/wireguard-go/wgcfg"
+	"inet.af/netaddr"
+	"tailscale.com/control/controlclient"
+	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/wgkey"
+	"tailscale.com/wgengine"
+	"tailscale.com/wgengine/router"
+)
+
+// Wireguard specific implementation of the Engine interface.
+type WireguardEngine struct {
+	wg      wgengine.Engine
+	port    uint16
+	privKey types.PrivateKey
+}
+
+// Creates Wireguard engine.
+func NewWireguardEngine(tunName string, port uint16, privKey types.PrivateKey) (Engine, error) {
+	e, err := wgengine.NewUserspaceEngine(log.Printf, tunName, port)
+	if err != nil {
+		return nil, err
+	}
+	return &WireguardEngine{
+		wg:      e,
+		port:    port,
+		privKey: privKey,
+	}, nil
+}
+
+// Used for unit testing.
+func NewFakeWireguardEngine(port uint16, privKey types.PrivateKey) (Engine, error) {
+	e, err := wgengine.NewFakeUserspaceEngine(log.Printf, port, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &WireguardEngine{
+		wg:      e,
+		port:    port,
+		privKey: privKey,
+	}, nil
+}
+
+func genWireguardConf(privKey types.PrivateKey, port uint16, netMap *types.NetworkMap) *wgcfg.Config {
+	c := &wgcfg.Config{
+		Name:       "foo",
+		PrivateKey: wgcfg.PrivateKey(privKey),
+		Addresses: []netaddr.IPPrefix{netaddr.IPPrefix{
+			IP:   netMap.Self.VPNIP,
+			Bits: 32, // TODO(giolekva): adapt for IPv6
+		}},
+		ListenPort: port,
+		Peers:      make([]wgcfg.Peer, 0, len(netMap.Peers)),
+	}
+	for _, peer := range netMap.Peers {
+		c.Peers = append(c.Peers, wgcfg.Peer{
+			PublicKey: wgcfg.Key(peer.PublicKey),
+			AllowedIPs: []netaddr.IPPrefix{netaddr.IPPrefix{
+				IP:   peer.VPNIP,
+				Bits: 32,
+			}},
+			Endpoints:           peer.DiscoEndpoint,
+			PersistentKeepalive: 15, // TODO(giolekva): make it configurable
+		})
+	}
+	return c
+}
+
+func genRouterConf(netMap *types.NetworkMap) *router.Config {
+	c := &router.Config{
+		LocalAddrs: []netaddr.IPPrefix{netaddr.IPPrefix{
+			IP:   netMap.Self.VPNIP,
+			Bits: 32,
+		}},
+		Routes: make([]netaddr.IPPrefix, 0, len(netMap.Peers)),
+	}
+	for _, peer := range netMap.Peers {
+		c.Routes = append(c.Routes, netaddr.IPPrefix{
+			IP:   peer.VPNIP,
+			Bits: 32,
+		})
+	}
+	return c
+}
+
+func genTailNetMap(privKey types.PrivateKey, port uint16, netMap *types.NetworkMap) *controlclient.NetworkMap {
+	fmt.Println(netMap.Self.IPPort.String())
+	c := &controlclient.NetworkMap{
+		SelfNode: &tailcfg.Node{
+			ID:       0, // TODO(giolekva): maybe IDs should be stored server side.
+			StableID: "0",
+			Name:     "0",
+			Key:      tailcfg.NodeKey(netMap.Self.PublicKey),
+			DiscoKey: tailcfg.DiscoKey(netMap.Self.DiscoKey),
+			Addresses: []netaddr.IPPrefix{netaddr.IPPrefix{
+				IP:   netMap.Self.VPNIP,
+				Bits: 32,
+			}},
+			AllowedIPs: make([]netaddr.IPPrefix, 0, len(netMap.Peers)),
+			Endpoints:  []string{netMap.Self.IPPort.String()},
+			KeepAlive:  true, // TODO(giolekva): make it configurable
+		},
+		NodeKey:    tailcfg.NodeKey(netMap.Self.PublicKey),
+		PrivateKey: wgkey.Private(privKey),
+		Name:       "0",
+		Addresses: []netaddr.IPPrefix{netaddr.IPPrefix{
+			IP:   netMap.Self.VPNIP,
+			Bits: 32,
+		}},
+		LocalPort: port,
+		Peers:     make([]*tailcfg.Node, 0, len(netMap.Peers)),
+	}
+	for i, peer := range netMap.Peers {
+		c.Peers = append(c.Peers, &tailcfg.Node{
+			ID:       tailcfg.NodeID(i + 1),
+			StableID: tailcfg.StableNodeID(fmt.Sprintf("%d", i+1)),
+			Name:     fmt.Sprintf("%d", i+1),
+			Key:      tailcfg.NodeKey(peer.PublicKey),
+			DiscoKey: tailcfg.DiscoKey(peer.DiscoKey),
+			Addresses: []netaddr.IPPrefix{netaddr.IPPrefix{
+				IP:   peer.VPNIP,
+				Bits: 32,
+			}},
+			AllowedIPs: []netaddr.IPPrefix{netaddr.IPPrefix{
+				IP:   netMap.Self.VPNIP,
+				Bits: 32,
+			}},
+			Endpoints: []string{peer.IPPort.String()},
+			KeepAlive: true,
+		})
+	}
+	return c
+}
+
+func (e *WireguardEngine) Configure(netMap *types.NetworkMap) error {
+	err := e.wg.Reconfig(
+		genWireguardConf(e.privKey, e.port, netMap),
+		genRouterConf(netMap))
+	if err != nil {
+		return err
+	}
+	e.wg.SetNetworkMap(genTailNetMap(e.privKey, e.port, netMap))
+	e.wg.RequestStatus()
+	return err
+}
+
+func (e *WireguardEngine) DiscoKey() types.DiscoKey {
+	return types.DiscoKey(e.wg.DiscoPublicKey())
+}
+
+func (e *WireguardEngine) DiscoEndpoint() string {
+	k := e.DiscoKey()
+	discoHex := hex.EncodeToString(k[:])
+	return fmt.Sprintf("%s%s", discoHex, controlclient.EndpointDiscoSuffix)
+}
+
+func (e *WireguardEngine) Ping(ip netaddr.IP, cb func(*ipnstate.PingResult)) {
+	e.wg.Ping(ip, cb)
+}
diff --git a/core/vpn/engine/wireguard_test.go b/core/vpn/engine/wireguard_test.go
new file mode 100644
index 0000000..39488e3
--- /dev/null
+++ b/core/vpn/engine/wireguard_test.go
@@ -0,0 +1,119 @@
+package engine
+
+import (
+	"fmt"
+	"log"
+	"testing"
+
+	"github.com/giolekva/pcloud/core/vpn/types"
+
+	"inet.af/netaddr"
+	"tailscale.com/ipn/ipnstate"
+)
+
+type node struct {
+	ip      netaddr.IP
+	privKey types.PrivateKey
+	node    types.Node
+	peers   []types.Node
+	e       Engine
+}
+
+func newNode(ip string, localPort uint16) (n *node, err error) {
+	n = &node{
+		ip:      netaddr.MustParseIP(ip),
+		privKey: types.NewPrivateKey(),
+	}
+	if n.e, err = NewFakeWireguardEngine(localPort, n.privKey); err != nil {
+		return
+	}
+	n.node = types.Node{
+		PublicKey:     n.privKey.Public(),
+		DiscoKey:      n.e.DiscoKey(),
+		DiscoEndpoint: n.e.DiscoEndpoint(),
+		IPPort: netaddr.IPPort{
+			IP:   netaddr.IPv4(127, 0, 0, 1),
+			Port: localPort,
+		},
+		VPNIP: netaddr.MustParseIP(ip),
+	}
+	return
+}
+
+func (n *node) addPeer(x types.Node) {
+	n.peers = append(n.peers, x)
+}
+
+func (n *node) configure() error {
+	return n.e.Configure(&types.NetworkMap{n.node, n.peers})
+}
+
+func (n *node) ping(ip string, ch chan<- *ipnstate.PingResult) {
+	n.e.Ping(netaddr.MustParseIP(ip), func(p *ipnstate.PingResult) {
+		ch <- p
+	})
+}
+
+func TestTwoPeers(t *testing.T) {
+	var a, b *node
+	var err error
+	if a, err = newNode("10.0.0.1", 1234); err != nil {
+		t.Fatal(err)
+	}
+	if b, err = newNode("10.0.0.2", 1235); err != nil {
+		t.Fatal(err)
+	}
+	a.addPeer(b.node)
+	b.addPeer(a.node)
+	if err := a.configure(); err != nil {
+		t.Fatal(err)
+	}
+	if err := b.configure(); err != nil {
+		t.Fatal(err)
+	}
+	ping := make(chan *ipnstate.PingResult, 0)
+	a.ping("10.0.0.2", ping)
+	b.ping("10.0.0.1", ping)
+	for i := 0; i < 2; i++ {
+		p := <-ping
+		if p.Err != "" {
+			t.Error(p.Err)
+		}
+		log.Printf("Ping received: %+v\n", p)
+	}
+}
+
+func TestTenPeers(t *testing.T) {
+	n := 10
+	nodes := make([]*node, n)
+	ping := make(chan *ipnstate.PingResult, 0)
+	for i := 0; i < n; i++ {
+		ip := fmt.Sprintf("10.0.0.%d", i+1)
+		localPort := uint16(i + 4321)
+		var err error
+		if nodes[i], err = newNode(ip, localPort); err != nil {
+			t.Fatal(err)
+		}
+		for j := 0; j < i; j++ {
+			nodes[i].addPeer(nodes[j].node)
+			nodes[j].addPeer(nodes[i].node)
+		}
+	}
+	for i := 0; i < n; i++ {
+		if err := nodes[i].configure(); err != nil {
+			t.Fatal(err)
+		}
+		for j := 0; j < i; j++ {
+			nodes[i].ping(nodes[j].ip.String(), ping)
+			nodes[j].ping(nodes[i].ip.String(), ping)
+		}
+
+	}
+	for i := 0; i < n*(n-1); i++ {
+		p := <-ping
+		if p.Err != "" {
+			t.Error(p.Err)
+		}
+		log.Printf("Ping received: %+v\n", p)
+	}
+}
diff --git a/core/vpn/go.mod b/core/vpn/go.mod
new file mode 100644
index 0000000..2e00dbd
--- /dev/null
+++ b/core/vpn/go.mod
@@ -0,0 +1,9 @@
+module github.com/giolekva/pcloud/core/vpn
+
+go 1.16
+
+require (
+	github.com/tailscale/wireguard-go v0.0.0-20210120212909-7ad8a0443bd3
+	inet.af/netaddr v0.0.0-20210105212526-648fbc18a69d
+	tailscale.com v1.4.5
+)
diff --git a/core/vpn/go.sum b/core/vpn/go.sum
new file mode 100644
index 0000000..612b9e7
--- /dev/null
+++ b/core/vpn/go.sum
@@ -0,0 +1,516 @@
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diff --git a/core/vpn/types/key.go b/core/vpn/types/key.go
new file mode 100644
index 0000000..1008634
--- /dev/null
+++ b/core/vpn/types/key.go
@@ -0,0 +1,13 @@
+package types
+
+import "tailscale.com/types/key"
+
+// Generates new private key.
+func NewPrivateKey() PrivateKey {
+	return PrivateKey(key.NewPrivate())
+}
+
+// Returns public coutnerpart of the given private key.
+func (k PrivateKey) Public() PublicKey {
+	return PublicKey(key.Private(k).Public())
+}
diff --git a/core/vpn/types/types.go b/core/vpn/types/types.go
new file mode 100644
index 0000000..a8a1ed7
--- /dev/null
+++ b/core/vpn/types/types.go
@@ -0,0 +1,30 @@
+package types
+
+import (
+	"github.com/tailscale/wireguard-go/wgcfg"
+	"inet.af/netaddr"
+)
+
+// Private key of the client.
+// MUST never leave the device it was generated on.
+type PrivateKey wgcfg.PrivateKey
+
+// Corresponding public key of the device.
+type PublicKey wgcfg.Key
+
+//Public discovery key of the device.
+type DiscoKey wgcfg.Key
+
+// Represents single node in the network.
+type Node struct {
+	PublicKey     PublicKey
+	DiscoKey      DiscoKey
+	DiscoEndpoint string
+	IPPort        netaddr.IPPort
+	VPNIP         netaddr.IP
+}
+
+type NetworkMap struct {
+	Self  Node
+	Peers []Node
+}