routeros-scripts/update-tunnelbroker

#!rsc
# RouterOS script: update-tunnelbroker
# Copyright (c) 2013-2018 Christian Hesse <mail@eworm.de>

:local tunnelurl "ipv4.tunnelbroker.net";
:local tunneluser "user";
:local tunnelpass "v3ry-s3cr3t";
:local tunnelid "user-XXX.tunnel.tserv6.fra1.ipv6.he.net";

# name of the local tunnel interface
:local tunnelint "tunnelbroker";

# get the last ip address from tunnel interface
:local tunnellastip [ / interface 6to4 get [ / interface 6to4 find where name=$tunnelint ] local-address ];

# Get the current ip address on interface with default route
:local tunnelip [ / ip route get [ / ip route find where gateway=[ / ip route get [ / ip route find where dynamic=yes and dst-address="0.0.0.0/0" dynamic active=yes ] gateway ] dst-address!="0.0.0.0/0" ] pref-src ];

# Did we get an IP address to compare?
:if ([ :typeof $tunnelip ] = nil) do={
  :log warning ("No default route? Could not get address, please check.");
} else={
  :if ($tunnelip != $tunnellastip) do={
    :log info ("Local address changed, sending UPDATE to tunnelbroker! New address: " . $tunnelip);
    / tool fetch mode=https address=$tunnelurl user=$tunneluser password=$tunnelpass \
      src-path=("/nic/update\?hostname=" . $tunnelid) keep-result=no;
    / interface 6to4 set [ / interface 6to4 find where name=$tunnelint ] local-address=$tunnelip;
  } else={
    :log debug "All tunnelbroker configuration is up to date.";
  }
}