1 files changed, 32 insertions, 0 deletions
diff --git a/update-gre-address.rsc b/update-gre-address.rsc
new file mode 100644
index 0000000..2958055
--- /dev/null
+++ b/update-gre-address.rsc
@@ -0,0 +1,32 @@
+#!rsc by RouterOS
+# RouterOS script: update-gre-address
+# Copyright (c) 2013-2023 Christian Hesse <mail@eworm.de>
+# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
+#
+# update gre interface remote address with dynamic address from
+# ipsec remote peer
+# https://git.eworm.de/cgit/routeros-scripts/about/doc/update-gre-address.md
+
+:local 0 "update-gre-address";
+:global GlobalFunctionsReady;
+:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
+
+:global CharacterReplace;
+:global LogPrintExit2;
+
+/interface/gre/set remote-address=0.0.0.0 disabled=yes [ find where !running !disabled ];
+
+:foreach Peer in=[ /ip/ipsec/active-peers/find ] do={
+  :local PeerVal [ /ip/ipsec/active-peers/get $Peer ];
+  :local GreInt [ /interface/gre/find where comment=($PeerVal->"id") or comment=[ $CharacterReplace ($PeerVal->"id") "CN=" "" ] ];
+  :if ([ :len $GreInt ] > 0) do={
+    :local GreIntVal [ /interface/gre/get $GreInt ];
+    :if ([ :typeof ($PeerVal->"dynamic-address") ] = "str" && \
+         ($PeerVal->"dynamic-address" != $GreIntVal->"remote-address" || \
+          $GreIntVal->"disabled" = true)) do={
+      $LogPrintExit2 info $0 ("Updating remote address for interface " . $GreIntVal->"name" . " to " . $PeerVal->"dynamic-address") false;
+      /interface/gre/set remote-address=0.0.0.0 disabled=yes [ find where remote-address=$PeerVal->"dynamic-address" name!=$GreIntVal->"name" ];
+      /interface/gre/set $GreInt remote-address=($PeerVal->"dynamic-address") disabled=no;
+    }
+  }
+}