Manual:IP/UPnP

Applies to RouterOS: 2.9, v3, v4

The MikroTik RouterOS supports Universal Plug and Play architecture for transparent peer-to-peer network connectivity of personal computers and network-enabled intelligent devices or appliances. UPnP builds enables these devices to automatically connect with one another and work together to make networking possible for more people.

Specifications

• Packages required: system
• License required: Level1
• Submenu level: /ip upnp
• Standards and Technologies: TCP/IP, HTTP, XML, IGD
• Hardware usage: Not significant

Description

UPnP enables data communication between any two devices under the command of any control device on the network. Universal Plug and Play is completely independent of any particular physical medium. It supports networking with automatic discovery without any initial configuration, whereby a device can dynamically join a network. DHCP and DNS servers are optional and will be used if available on the network. UPnP implements simple yet powerfull NAT traversal solution, that enables the client to get full two-way peer-to-peer network support from behind the NAT.

There are two interface types for UPnP: internal (the one local clients are connected to) and external (the one the Internet is connected to). A router may only have one external interface with a 'public' IP address on it, and as many internal interfaces as needed, all with source-NATted 'internal' IP addresses.

The UPnP protocol is used for many modern applications, like most of DirectX games, as well as for various Windows Messenger features (remote asisstance, application sharing, file transfer, voice, video) from behind a firewall.

Additional Resources

UPnP Forum

Enabling Universal Plug-n-Play

• Submenu level: /ip upnp

Property Description

• allow-disable-external-interface (yes | no; default: yes) - whether or not should the users be allowed to disable router's external interface. This functionality (for users to be able to turn the router's external interface off without any authentication procedure) is required by the standard, but as it is sometimes not expected or unwanted in UPnP deployments which the standard was not designed for (it was designed mostly for home users to establish their ownlocal networks), you can disable this behavior
• enabled (yes | no; default: no) - whether UPnP feature is enabled
• show-dummy-rule (yes | no; default: yes) - this is to enable a workaround for some broken implementations, which are handling the absense of UPnP rules incorrectly (for example, popping up error messages). This option will instruct the server to install a dummy (meaningless) UPnP rule that can be observed by the clients, which refuse to work correctly otherwise

Warning: if you do not disable the allow-disable-external-interface, any user from the local network will be able (without any authentication procedures) to disable the router's external interface.

Example

To enable UPnP feature:

[admin@MikroTik] ip upnp> set enable=yes
[admin@MikroTik] ip upnp> print
                             enabled: yes
    allow-disable-external-interface: yes
                     show-dummy-rule: yes
[admin@MikroTik] ip upnp>

UPnP Interfaces

• Submenu level: /ip upnp interfaces

Property Description

• interface (name) - interface name UPnP will be run on
• Type(external | internal) - interface type, one of the:
  • external - the interface a global IP address is assigned to
  • internal - router's local interface the clients are connected to

Note: It is highly recommended to upgrade DirectX runtime libraries to version DirectX 9.0c or higher and Windows Messenger to version Windows Messenger 5.0 or higher in order to get UPnP to work properly.

Example

We have masquerading already enabled on our router:

[admin@MikroTik] ip upnp interfaces> /ip firewall src-nat print
Flags: X - disabled, I - invalid, D - dynamic
  0   chain=srcnat action=masquerade out-interface=ether1
[admin@MikroTik] ip upnp interfaces>

Now all we have to do is to add interfaces and enable UPnP:

[admin@MikroTik] ip upnp interfaces> add interface=ether1 type=external
[admin@MikroTik] ip upnp interfaces> add interface=ether2 type=internal
[admin@MikroTik] ip upnp interfaces> print
Flags: X - disabled
  #   INTERFACE TYPE
  0 X ether1    external
  1 X ether2    internal

[admin@MikroTik] ip upnp interfaces> enable 0,1
[admin@MikroTik] ip upnp interfaces> .. set enabled=yes
[admin@MikroTik] ip upnp interfaces>

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