# UPnP not working with my FRITX!Box
**URL:** https://forum.syncthing.net/t/upnp-not-working-with-my-fritx-box/18281
**Category:** Support
**Created:** [April 9, 2022, 8:41am UTC](https://forum.syncthing.net/t/upnp-not-working-with-my-fritx-box/18281 "2022-04-09T08:41:06Z")
**Posts on this page:** 1
**Showing post:** 16
### Author:  [@bt90](https://forum.syncthing.net/u/bt90)
#### Post date: [April 12, 2022, 7:47pm UTC](https://forum.syncthing.net/t/upnp-not-working-with-my-fritx-box/18281/16 "2022-04-12T19:47:45Z")
Although the FritzBox behaves buggy, i’d expect Syncthing to try the more modern IGDv2 first and only try to fallback to IGDv1 if this fails.
IPv6 UPnP support would also be super nice.
>
>
> At the moment only IPv4 is supported via UPnP. It would be really helpful to als…o add UPnP pinhole support in order to control the firewall of the router and allow incoming traffic directly to the device.
>
> Relying only on IPv4 is not an option for devices stuck behind a dualstack lite connection as incoming IPv4 connections are blocked by Carrier Grade NAT.
>
> See http://upnp.org/specs/gw/UPnP-gw-WANIPv6FirewallControl-v1-Service.pdf
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