[Feature Request] UPnP Server

[rankaiyx]

Add upnp function to the router so that port mapping can be completed automatically. This should be an exciting feature.

[heiher]

Is possible to do this in hook script? add port mapping rule by call upnp client util (e.g. miniupnpc).

[rankaiyx]

Both methods can do this by plug-in or by integrating a upnp server. We can try both methods and see which is easier to implement.

[rankaiyx]

I found a upnp project that may be of reference value. https://github.com/ofekp/TinyUPnP

[rankaiyx]

https://github.com/easion/tinynatpmpd

[rankaiyx]

https://www.rfc-editor.org/rfc/rfc6886.html

"Correspondingly, NAT-PMP allows a client to request a desired external port, and if that external port is already in use by some other client, the NAT-PMP server will instead assign some other available external port. UPnP IGD does not do this. "

This gives us the opportunity to return the actual external port to the client.

[OpportunityLiu]

I've made a simple implementation with nodejs.

https://github.com/OpportunityLiu/nat-mapmp

[rankaiyx]

I've made a simple implementation with nodejs.

https://github.com/OpportunityLiu/nat-mapmp Great! We need a usage document.

[OpportunityLiu]

Great! We need a usage document.

I've added readme and releases. You can also use ./nat-mapmp.mjs --help to see all options.

[OpportunityLiu]

https://www.rfc-editor.org/rfc/rfc6886.html

"Correspondingly, NAT-PMP allows a client to request a desired external port, and if that external port is already in use by some other client, the NAT-PMP server will instead assign some other available external port. UPnP IGD does not do this. "

This gives us the opportunity to return the actual external port to the client.

https://datatracker.ietf.org/doc/html/rfc6886#section-9

Basically, run UPnP IGD server behind NAT is impossible, as well as PCP with PREFER_FAILURE support (which is designed for working with IGD, see https://datatracker.ietf.org/doc/html/rfc6887#section-13.2)

As rfc6970 Universal Plug and Play (UPnP) Internet Gateway Device - Port Control Protocol Interworking Function suggests, an IGD-PCP server will respond ConflictInMappingEntry for AddPortMapping() request, which will cause an IGD client trying all 65536 ports, and results in nothing.