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#!rsc by RouterOS
# RouterOS script: update-gre-address
# Copyright (c) 2013-2022 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;
}
}
}
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