diff --git a/lib/common b/lib/common
index 868a5f6..31d348e 100644
--- a/lib/common
+++ b/lib/common
@@ -95,6 +95,17 @@ lowercase () {
   tr "[:upper:]" "[:lower:]"
 }
 
+# Convierte llaves públicas en MAC
+public_key_to_mac () {
+  grep -E "^[A-Za-z0-9/+=]+$" \
+    | base64 -d \
+    | sha256sum \
+    | cut -d " " -f 1 \
+    | cut -b 1-12 \
+    | sed -re "s/../&:/g" \
+    | cut -d : -f 1-6
+}
+
 # Limpia el hostname
 # @see tincd.conf(5)
 get_node_name() {
diff --git a/lib/exec/install b/lib/exec/install
index 1719ae7..e56fcdc 100755
--- a/lib/exec/install
+++ b/lib/exec/install
@@ -44,6 +44,12 @@ nodedir="$(get_node_dir "${1}")"
 # Crear el directorio de scripts
 mkdir -p "${nodedir}/scripts"
 
+# Setear la MAC si no existía ya
+if ! test -f "${nodedir}/mac"; then
+  msg "Estableciendo MAC"
+  get_node_file "${1}" | xargs cat | public_key_to_mac > "${nodedir}/mac"
+fi
+
 msg "Instalando en el sistema..."
 ${sudo} mkdir -p "${TINC}"
 ${sudo} rsync -a --no-owner \
diff --git a/skel/scripts/ula-hosts b/skel/scripts/ula-hosts
index 52b49f7..6edb779 100755
--- a/skel/scripts/ula-hosts
+++ b/skel/scripts/ula-hosts
@@ -1,8 +1,9 @@
-#!/bin/bash
+#!/bin/sh
 set -euo pipefail
 IFS=$'\n\t'
 
-ULA_PREFIX="fd00:1312:acab::"
+ULA_PREFIX="fd00:acab"
+ULA_SUBNET="/32"
 ETCHOSTS="/etc/hosts"
 # Added at the end of each line in the hosts file.
 COMMENT="# Managed by tinc ${NETNAME}"
@@ -16,20 +17,22 @@ function mac_to_address () {
 
 case $2 in
   subnet)
-    IP="${ULA_PREFIX}$(mac_to_address "${SUBNET}")"
+    _mac="$(mac_to_address "${SUBNET}")"
+    IP="${ULA_PREFIX}::${_mac}"
+    if test "${ULA_SUBNET}" = "/32"; then
+      case $1 in
+        up) ip -6 route add "${ULA_PREFIX}:${_mac}::/80" via "${IP}" dev "${INTERFACE}" ;;
+        down) ip -6 route del "${ULA_PREFIX}:${_mac}::/80" via "${IP}" dev "${INTERFACE}" ;;
+      esac
+    fi
     ;;
   tinc)
     MAC="$(cat "/sys/class/net/${INTERFACE}/address")"
-    IP="${ULA_PREFIX}$(mac_to_address "${MAC}")"
+    IP="${ULA_PREFIX}::$(mac_to_address "${MAC}")"
     case $1 in
-      up)
-        ip address add "${IP}/64" dev "${INTERFACE}"
-        ;;
-      down)
-        sed -re "/${COMMENT}$/d" -i "${ETCHOSTS}"
-        ;;
-    esac
-    ;;
+      up) ip address add "${IP}${ULA_SUBNET}" dev "${INTERFACE}" ;;
+      down) sed -re "/${COMMENT}$/d" -i "${ETCHOSTS}" ;;
+    esac ;;
 esac
 
 test -z "${NODE}" && exit
diff --git a/skel/tinc-up b/skel/tinc-up
index 5ab7c98..ec2f676 100755
--- a/skel/tinc-up
+++ b/skel/tinc-up
@@ -1,6 +1,8 @@
 #!/bin/sh
 
+cd `dirname "$0"`
+
+ip link set dev ${INTERFACE} address `cat mac`
 ip link set ${INTERFACE} up
 
-cd `dirname "$0"`
 . ./run-script