Mikrotik - links vpn bridge

http://forum.mikrotik.com/viewtopic.php?t=55773

http://forum.mikrotik.com/viewtopic.php?t=85962

http://forum.mikrotik.com/viewtopic.php?t=19130

http://forum.mikrotik.com/viewtopic.php?t=29668

http://www.urosvovk.com/step-by-step-how-to-configure-a-pptp-vpn-server-on-mikrotik-routeros/

https://rizalsilalahi.wordpress.com/tutorial-mikrotik-vpn-point-to-point-tunnel-protocol-pptp/

--- verificar links - backhaul - airview
http://www.wisp.net.au/pptp-connection-with-bridge-pm-23.html
https://www.nasa-security.net/mikrotik/mikrotik-l2tp-with-ipsec/
https://www.nasa-security.net/mikrotik/l2tp-ipsec-vpn-site-to-site-mikrotik-how-to/
http://wiki.mikrotik.com/wiki/Manual:BCP_bridging_%28PPP_tunnel_bridging%29