RouterOS OpenVPN

RouterOS support OpenVPN server and client. OpenVPN is one mostly secure VPN tunnel protocol.

Server

This manual shows, how to configure Mikrotik OpenVPN Server.

Requirements / Recommendation =

• SSL Root Certificate (CA)
• SSL Server Certificate
• SSL Client Certificate

• Tested Mikrotik RB951G-2HnD and RouterOS 6.26

How to

1. Create SSL certificate first, example OpenSSL and move certificate to Mikrotik with Winbox.

Import Certificate key and certificate to RouterOS.

/certificates import file-name=ssl.key

/certificates import file-name=ssl.crt

2. Create DHCP Pool (if you want use bridge, you can skip this step)

  /ip pool add name=ovpn-pool ranges=10.15.32.34-10.15.32.38

• DHCP pool name is ovpn-pool
• Pool area is 10.15.32.34-10.15.32.38

3. Create routing OpenVPN network to local network (if you want use bridge mode, you can skip this step)

 /ip firewall nat add chain=srcnat  out-interface=ether2 action=masquerade

Create NAT to ether2 interface

4. Create OpenVPN Profile

 /ppp profile add name=openvpn local-address=10.15.32.33 remote-address=ovpn-pool 

• Profile name is openvpn
• Local IP-address is 10.15.32.33
• VPN customer get remote IP-address from ovpn - DHCP pool.

• Using bridge, please remove local-address and remote address. Add bridge, example bridge-local

 /ppp profile add name=openvpn_bridge bridge=bridge-local

5. Create VPN user

 /ppp secret add disabled=no   name="openvpn" password="Qwerty1" service=any

• Username: openvpn
• Password: Qwerty1
• Service what can use this user: Openvpn

6. OpenVPN server configuration

 /interface ovpn-server server set auth=sha1, certificate=ssl_cert cipher=aes128,aes256 default-profile=openvpn enabled=yes keepalive-timeout=60 max-mtu=1500 mode=ip netmask=29 port=1194 require client-certificate=no

• Authentication: SHA1
• SS Certificate: ssl-cert
• SSL Chipper: AES128, AES256
• Default Profile: openvpn
• Keepalive-timeout=60
• MAX-MTU (packet size): 1500
• mode=ip (if you use bridge mode, change this to ethernet)
• require client-certificate=no (if you use client certificate, change value to yes)

6. Enable access from firewall

 /ip firewall filter add action=accept chain=input comment="OpenVPN" disabled=no dst-port=1194 protocol=tcp

Create new firewall rule what accept protocol TCP port 1194

Radius

• Lisää Mikrotikkiin Radius palvelimesi asetukset /radius alle.
• Määritä palvelimelle sallituksi todennustyypit CHAP / PAP, SPAP
• Määritä NAS Port tyypiksi Async.

 /radius add service=ppp address=10.0.0.254 secret=securepassu authentication-port=1812 accounting-port=1813

Esimerkki konfiguraatiot Windows NPS palvelimelta.

Client

RouterOS

OpenVPN client can connect to OpenVPN server.

1. Create OpenVPN client profile to client device.

 /ppp profile add name=openvpn-client

2. Create new OpenVPN client:

 /interface ovpn-client name="openvpn-client" connect-to="server.openvpn.com" port="1194" mode="ip" user="openvpn" password="openvpn123" profile="openvpn-client" certificate="no" auth="sha1" cipher="aes128" add-default-route="no"

• name = connection name
• connect-to = OpenVPN Server address or IP-address
• port = OpenVPN Server port what server listen
• mode = ip (ethernet, if you use bridge mode on VPN server)
• user = OpenVPN user
• password = OpenVPN user password
• profile = Profile what OpenVPN use
• certificate = SSL client certificate
• add-default-route = Add this VPN to default route?

3. Try connect and watch log if connection not working.

Linux

Esimerkki konfiguraatio client.ovpn:

client

dev tun #Voi olla tap. Tun on reitittävä ja tap on siltaava. Katso että vastaa palvelimen konfiguraatiota. 
proto tcp #Tai udp, RouterOS ei tue UDP:nä.

resolv-retry infinite
nobind

remote vpn.example.org 1194 # Etä OpenVPN palvelimen osoite tai IP-osoite sekä portti


#Lisää tähän rootCA jonka olet luonut, avaa se ja kopioi sisältö
<ca>
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
</ca>

#Lisää tähän asiakas sertifikaatin jonka olet luonut.
<cert>
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
</cert>

#Lisää tähän asiakkaan sertifikaatin privaatti avaimen.
<key>
-----BEGIN PRIVATE KEY-----
-----END PRIVATE KEY-----
</key>

tls-client
port 1194 #Portti jota palvelin kuuntelee

user nobody
group nogroup

#comp-lzo # Do not use compression. It doesn't work with RouterOS (at least up to RouterOS 3.0rc9)

# More reliable detection when a system loses its connection.
ping 15
ping-restart 10
ping-timer-rem
persist-tun
persist-key

# Silence  the output of replay warnings, which are a common false
# alarm on WiFi networks.  This option preserves the  security  of
# the replay protection code without the verbosity associated with
# warnings about duplicate packets.
mute-replay-warnings

# Verbosity level.
# 0 = quiet, 1 = mostly quiet, 3 = medium output, 9 = verbose
verb 3

cipher AES-256-CBC
auth SHA1
pull

route-nopull
#Verkot jotka reititetään VPN verkkoon
route 192.168.1.0 255.255.255.0


push "dhcp-option DNS 8.8.8.8" #DNS palvelin jota käytetään

#redirect-gateway def1 #Haluatko reitittää kaikki VPN kautta? Ota tästä risuaita pois

#Salasana tiedosto
auth-user-pass auth.cfg

auth.cfg tiedoston tulisi sisältää käyttäjänimen (username) ja salasananan (password)

username
password