--- network/connections/ethernet.orig	2012-03-13 08:12:07.562610031 +0100
+++ network/connections/ethernet	2012-03-13 08:16:14.742610392 +0100
@@ -14,6 +14,8 @@
 }
 
 ethernet_up() {
+    local timeout="${TIMEOUT:-3}"
+
     load_profile "$1"
 
     if [[ ! -e "/sys/class/net/$INTERFACE" ]]; then
@@ -186,6 +188,12 @@
             fi
         fi
 
+        # Wait for duplicate address detection to finish
+        while [[ -n "$(ip -6 addr show tentative)" && $timeout -gt 0 ]]; do
+            sleep 1
+            let timeout--
+        done
+
         # Add static IPv6 routes
         if [[ -n "$ROUTES6" ]]; then
             for route in "${ROUTES6[@]}"; do