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http://wiki.mikrotik.com/wiki/Manual:Interface/L2TP#Server_configuration
http://wiki.mikrotik.com/wiki/Manual:Interface/L2TP
https://www.youtube.com/watch?v=tpgEqzwj_OQ
PPP → Interface → PPTP Server → Enable
PPP → Secrets
pptp
default-encryption
IP → Pool → Add
PPP → Profiles → Default-Encryption
PPP → PPTP Server → Secrets
Enable Proxy-ARP on the LAN interface for proper (layer 2 address) ARP resolution.
If you use a LAN bridge, modify that.
Interfaces → etherN → General → ARP → Proxy-ARP
PPTP uses:
Accept PPTP in Mikrotik:
/ip firewall filter add chain=input action=accept protocol=tcp dst-port=1723 /ip firewall filter add chain=input action=accept protocol=gre