diff --git a/install_windows/01_install_backuppc.sh b/install_windows/01_install_backuppc.sh
index edfed6d..77326ee 100755
--- a/install_windows/01_install_backuppc.sh
+++ b/install_windows/01_install_backuppc.sh
@@ -10,6 +10,13 @@ case $lang in
     *)    group_name="Backup Operators" ;;
 esac
 
+ip_ur1=$(wget http://checkip.dyndns.org/ -O - -o /dev/null | cut -d" " -f 6 | cut -d\< -f 1 | cut -d'.' -f1-2)
+
+if [[ ${ip_ur1} != "129.20" ]]; then
+  printf "Merci de vous connecter au réseau 'univ-rennes1' et relancer le 01_install_backuppc.exe\n"
+  exit 1
+fi
+
 net user backuppc $(openssl rand -base64 8) /add     # Creation compte backuppc (mot de passe aleatoire)
 #net localgroup "Administrateurs" backuppc /add       # Ajout des droits admin a backuppc
 net localgroup "$group_name" backuppc /add