PPTP is a secure tunnel for transporting IP traffic using PPP. PPTP encapsulates PPP in virtual lines that run over IP. PPTP incorporates PPP and MPPE (Microsoft Point to Point Encryption) to make encrypted links. The purpose of this protocol is to make well-managed secure connections between routers as well as between routers and PPTP clients (clients are available for and/or included in almost all OSs including Windows). Multilink PPP (MP) is supported in order to provide MRRU (the ability to transmit full-sized 1500 and larger packets) and bridging over PPP links (using Bridge Control Protocol (BCP) that allows to send raw Ethernet frames over PPP links). This way it is possible to setup bridging without EoIP. The bridge should either have an administratively set MAC address or an Ethernet-like interface in it, as PPP links do not have MAC addresses. PPTP includes PPP authentication and accounting for each PPTP connection. Full authentication and accounting of each connection may be done through a RADIUS client or locally. MPPE 40bit RC4 and MPPE 128bit RC4 encryption are supported. PPTP traffic uses TCP port 1723 and IP protocol GRE (Generic Routing Encapsulation, IP protocol ID 47), as assigned by the Internet Assigned Numbers Authority (IANA). PPTP can be used with most firewalls and routers by enabling traffic destined for TCP port 1723 and protocol 47 traffic to be routed through the firewall or router. PPTP connections may be limited or impossible to setup though a masqueraded/NAT IP connection. Please see the Microsoft and RFC links listed below for more information. Sub-menu:
This example demonstrates how to set up PPTP client with username "pptp-hm", password "123" and server 10.1.101.100 Sub-menu: This sub-menu shows interfaces for each connected PPTP clients. An interface is created for each tunnel established to the given server. There are two types of interfaces in PPTP server's configuration Dynamic interfaces appear when a user connects and disappear once the user disconnects, so it is impossible to reference the tunnel created for that use in router configuration (for example, in firewall), so if you need a persistent rules for that user, create a static entry for him/her. Otherwise it is safe to use dynamic configuration. Note: in both cases PPP users must be configured properly - static entries do not replace PPP configuration.
Sub-menu: Properties: To enable PPTP server:
Monitor command can be used to monitor status of the tunnel on both client and server. Read-only properties The following example shows how to connect a computer to a remote office network over PPTP encrypted tunnel giving that computer an IP address from the same network as the remote office has (without need of bridging over EoIP tunnels) Consider following setup Office router is connected to internet through ether1. Workstations are connected to ether2. Laptop is connected to the internet and can reach Office router's public IP (in our example it is 192.168.80.1).
Notice that pptp local address is the same as routers address on local interface and remote address is form the same range as local network (10.1.101.0/24). Next step is to enable pptp server and pptp client on the laptop. PPTP client from the laptop should connect to routers public IP which in our example is 192.168.80.1.
At this point (when pptp client is successfully connected) if you will try to ping any workstation form the laptop, ping will time out, because Laptop is unable to get ARPs from workstations. Solution is to set up proxy-arp on local interface After proxy-arp is enabled client can successfully reach all workstations in local network behind the router.
The following is an example of connecting two Intranets using PPTP tunnel over the Internet. Consider following setup Office and Home routers are connected to internet through ether1, workstations and laptops are connected to ether2. Both local networks are routed through pptp client, thus they are not in the same broadcast domain. If both networks should be in the same broadcast domain then you need to use BCP and bridge pptp tunnel with local interface. First step is to create a user Notice that we set up pptp to add route whenever client connects. If this option is not set, then you will need static routing configuration on the server to route traffic between sites through pptp tunnel. Next step is to enable pptp server on the office router and configure pptp client on the Home router. Now we need to add route to reach local network behind Home router Now after tunnel is established and routes are set, you should be able to ping remote network.PPTP Client
/interface pptp-client
Properties
Property Description add-default-route (yes | no; Default: no) Whether to add PPTP remote address as a default route. allow (mschap2 | mschap1 | chap | pap; Default: mschap2, mschap1, chap, pap) Allowed authentication methods. connect-to (IP; Default: ) Remote address of PPTP server dial-on-demand (yes | no; Default: no) disabled (yes | no; Default: yes) Whether interface is disabled or not. By default it is disabled max-mru (integer; Default: 1460) Maximum Receive Unit. Max packet size that PPTP interface will be able to receive without packet fragmentation. max-mtu (integer; Default: 1460) Maximum Transmission Unit. Max packet size that PPTP interface will be able to send without packet fragmentation. mrru (disabled | integer; Default: disabled) Maximum packet size that can be received on the link. If a packet is bigger than tunnel MTU, it will be split into multiple packets, allowing full size IP or Ethernet packets to be sent over the tunnel. Read more >>
name (string; Default: ) Descriptive name of the interface. password (string; Default: "") Password used for authentication. profile (name; Default: default-encryption) Used PPP profile. user (string; Default: ) User name used for authentication. Quick example
[admin@dzeltenais_burkaans] /interface pptp-client>add name=pptp-hm user=pptp-hm password=123 \
\... connect-to=10.1.101.100 disabled=no
[admin@dzeltenais_burkaans] /interface pptp-client> print detail
Flags: X - disabled, R - running
0 name="pptp-hm" max-mtu=1460 max-mru=1460 mrru=disabled
connect-to=10.1.101.100 user="pptp-hm" password="123"
profile=default-encryption add-default-route=no dial-on-demand=no
allow=pap,chap,mschap1,mschap2
PPTP Server
/interface pptp-server
Server configuration
/interface pptp-server server
Property Description authentication (pap | chap | mschap1 | mschap2; Default: mschap1,mschap2) Authentication methods that server will accept. default-profile (name; Default: default-encryption) enabled (yes | no; Default: no) Defines whether PPTP server is enabled or not. keepalive-timeout (time; Default: 30) Defines the time period (in seconds) after which the router is starting to send keepalive packets every second. If no traffic and no keepalive responses has came for that period of time (i.e. 2 * keepalive-timeout), not responding client is proclaimed disconnected max-mru (integer; Default: 1460) Maximum Receive Unit. Max packet size that PPTP interface will be able to receive without packet fragmentation. max-mtu (integer; Default: 1460) Maximum Transmission Unit. Max packet size that PPTP interface will be able to send without packet fragmentation. mrru (disabled | integer; Default: disabled) Maximum packet size that can be received on the link. If a packet is bigger than tunnel MTU, it will be split into multiple packets, allowing full size IP or Ethernet packets to be sent over the tunnel. Read more >>
[admin@MikroTik] interface pptp-server server> set enabled=yes
[admin@MikroTik] interface pptp-server server> print
enabled: yes
max-mtu: 1460
max-mru: 1460
mrru: disabled
authentication: mschap2,mschap1
keepalive-timeout: 30
default-profile: default
[admin@MikroTik] interface pptp-server server>
Monitoring
[admin@dzeltenais_burkaans] /interface pptp-client> monitor 0 status: "connected" uptime: 7h24m18s idle-time: 6h21m4s encoding: "MPPE128 stateless" mtu: 1460 mru: 1460
Property Description status () Current PPTP status. Value other than "connected" indicates that there are some problems estabising tunnel. uptime (time) Elapsed time since tunnel was established. idle-time (time) Elapsed time since last activity on the tunnel. encoding () Used encryption method mtu (integer) Negotiated and used MTU mru (integer) Negotiated and used MRU Application Examples
Connecting Remote Client
First step is to create a user[admin@RemoteOffice] /ppp secret> add name=Laptop service=pptp password=123
local-address=10.1.101.1 remote-address=10.1.101.100
[admin@RemoteOffice] /ppp secret> print detail
Flags: X - disabled
0 name="Laptop" service=pptp caller-id="" password="123" profile=default
local-address=10.1.101.1 remote-address=10.1.101.100 routes==""
[admin@RemoteOffice] /ppp secret>
[admin@RemoteOffice] /interface pptp-server server> set enabled=yes
[admin@RemoteOffice] /interface pptp-server server> print
enabled: yes
max-mtu: 1460
max-mru: 1460
mrru: disabled
authentication: mschap2
keepalive-timeout: 30
default-profile: default
[admin@RemoteOffice] /interface pptp-server server>
Please, consult the respective manual on how to set up a PPTP client with the software You are using.[admin@RemoteOffice] /interface ethernet> set Office arp=proxy-arp
[admin@RemoteOffice] /interface ethernet> print
Flags: X - disabled, R - running
# NAME MTU MAC-ADDRESS ARP
0 R ether1 1500 00:30:4F:0B:7B:C1 enabled
1 R ether2 1500 00:30:4F:06:62:12 proxy-arp
[admin@RemoteOffice] interface ethernet>
Site-to-Site PPTP
[admin@RemoteOffice] /ppp secret> add name=Home service=pptp password=123
local-address=172.16.1.1 remote-address=172.16.1.2 routes="10.1.202.0/24 172.16.1.2 1"
[admin@RemoteOffice] /ppp secret> print detail
Flags: X - disabled
0 name="Home" service=pptp caller-id="" password="123" profile=default
local-address=172.16.1.1 remote-address=172.16.1.2 routes=="10.1.101.0/24 172.16.1.1 1"
[admin@RemoteOffice] /ppp secret>
[admin@RemoteOffice] /interface pptp-server server> set enabled=yes
[admin@RemoteOffice] /interface pptp-server server> print
enabled: yes
max-mtu: 1460
max-mru: 1460
mrru: disabled
authentication: mschap2
keepalive-timeout: 30
default-profile: default
[admin@RemoteOffice] /interface pptp-server server>
[admin@Home] /interface pptp-client> add user=Home password=123 connect-to=192.168.80.1 disabled=no
[admin@Home] /interface pptp-client> print
Flags: X - disabled, R - running
0 name="pptp-out1" max-mtu=1460 max-mru=1460 mrru=disabled connect-to=192.168.80.1 user="Home"
password="123" profile=default-encryption add-default-route=no dial-on-demand=no
allow=pap,chap,mschap1,mschap2
[admin@Home] /interface pptp-client>
[admin@RemoteOffice] /ip route> add dst-address=10.1.202.0/24 gateway=172.16.1.2
Manual:Interface/PPTP
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