Setting up a SSTP tunnel between RUT and Mikrotik device

Introduction

Secure Socket Tunneling Protocol (SSTP) is a VPN protocol designed to transport PPP traffic via a secure SSL/TLS channel.

This article provides a guide on how to configure SSTP tunnel between RUTxxx (client) and Mikrotik (server) routers.

Prerequisites

• One RUTxxx router of any type
• One Mikrotik router (this configuration example was created using Mikrotik rb750gr3)
• Server must have a Public Static or Public Dynamic IP address
• At least one end device (PC, Laptop) to configure the routers
• WinBox application

Configuration scheme

Mikrotik (server) configuration

Connect to MikroTik by using WinBox application and press New Terminal.

Prerequisite for any VPN server is to get certificates sorted. Procedure is exactly the same as for OpenVPN server setup with the slight difference being that common-name really matters. It must match either external IP or external host name – no exceptions. Use these commands to create certificates:

/certificate

add name=ca-template common-name=example.com  days-valid=3650 key-size=2048 key-usage=crl-sign,key-cert-sign

add name=server-template common-name=example.com  days-valid=3650 key-size=2048 key-usage=digital-signature,key-encipherment,tls-server

add name=client-template common-name=client.example.com  days-valid=3650 key-size=2048 key-usage=tls-client

sign ca-template name=ca-certificate

sign server-template name=server-certificate ca=ca-certificate

sign client-template name=client-certificate ca=ca-certificate

You will need to export root certificate, to do so use these commands:

/certificate

export-certificate ca-certificate export-passphrase=""

Instead of editing the default encrypted profile, we can create a new one. Assumption is that your MikroTik will also be a DNS server. And while at it, create secure user/password:

/ppp

profile add name="vpn-profile" use-encryption=yes local-address=192.168.8.250 dns-server=192.168.8.250 remote-address=vpn-pool

secret add name=user profile=vpn-profile password=password

Enable SSTP VPN server interface:

/interface sstp-server server

set enabled=yes default-profile=vpn-profile authentication=mschap2 certificate=server-certificate force-aes=yes pfs=yes

Do not forget to adjust firewall if necessary (TCP port 443):

/ip firewall filter

add chain=input protocol=tcp dst-port=443 action=accept place-before=0 comment="Allow SSTP"

Now go to Files and export the certificate by simply dragging it to your desktop.

RUTxxx (client) configuration

Access RUTxxx WebUI and go to Service > VPN > SSTP. There create a new configuration by writing configuration name and pressing Add button. It should appear after a few seconds. Then press Edit.

Now apply the following configuration.

1. Enable Instance.
2. Write Server IP address (MikroTik public IP address).
3. Write Username (write the username which you created with this command: secret add name=user profile=vpn-profile password=password).
4. Write Password (write the password which you created with this command: secret add name=user profile=vpn-profile password=password).
5. Upload CA cert (the file which you exported from MikroTik).
6. Press Save.

Testing configuration

Go to Status > Routes and in the Active IP Routes table you should see this new route.

Try to ping the remote VPN endpoint via CLI or SSH using this command:

ping 192.168.8.250