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====== Mikrotik L2TP VPN ======

**RouterOS v6.44 or above**: https://saputra.org/threads/mikrotik-l2tp-over-ipsec-vpn-server-tutorial-guide-for-routeros-v6-44.106/

Stats: http://rickfreyconsulting.com/mikrotik-vpns/

New info? http://wiki.mikrotik.com/wiki/Manual:IP/IPsec#Road_Warrior_setup_with_Mode_Conf

FIXME Needs verification and completion

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

  * All traffic routes through tunnel

===== Enable L2TP Server =====

**PPP -> Interface -> L2TP Server -> Enable**

  * Max MTU
    * L2TP has 40-byte overhead
    * 1450 - Lowering the MTU can speed up VPN - test path MTU first
    * 1460 - Default - Good if uplink MTU is 1500
  * Default Profile
    * Select ''default-encryption'' or create your own profile
  * Authentication
    * De-select ''chap'' and ''pap''
    * Select ''MSCHAPv2'' and ''MSCHAP1''
  * Select ''Use IPsec''
  * Enter IPsec Secret needed to configure client
  * Click ''OK''

===== Create IP Pool for Multiple Users =====

**IP -> Pool -> Add**

  * Name L2TPpool
  * Range of addresses e.g. (192.168.1.10-192.168.1.20) outside of LAN DHCP range

**PPP -> Profiles -> Default-Encryption**

  * Local Address (same for all)
  * Remote Address (pool you created)

**PPP -> Interface -> L2TP Server**

  * Specify Default Profile -> ''default-encryption''

===== Create Users =====

**PPP -> Secrets -> Add+**

  * **Name**
    * Username
  * **Password**
  * **Service**
    * ''l2tp''
  * **Local Address** (leave blank if using IP pool)
    * Same for all users
    * Router's LAN address
  * **Remote Address** (leave blank if using IP pool)
    * Different for each user 
    * Outside of DHCP range
  * **Profile**
    * ''default-encryption''

===== Proxy-ARP =====

:!: 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**
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