Good evening (at least in my country), I am sorry I didn't mention UPnP in my last question. I was searching it all day, so forgot to mention it. I am using 2 ASUS RT-N12s (first revision without letter and D). My network setup looks like this: 192.168.1.1, Tomato Firmware 1.28.0000 MIPSR2-138 K26 Max: This serves as a router. UPnP and NAT-PMP is enabled. I am not sure about any other change in settings (despite of creating wireless network). 192.168.1.2, Tomato Firmware 1.28.0000 MIPSR2-138 K26 MiniIPv6: This serves as an AP. UPnP and NAT-PMP is disabled. Basic -> Network: WAN Settings: Type: Disabled Wireless Client Mode: Disabled Bridge WAN port to primary LAN (br0): enabledLAN: Bridge: 0 STP: disabled IP: 192.168.1.2 Mask: 255.255.255.0 DHCP: disabled IP range: - Lease time: -Default Gateway: 192.168.1.1 Advanced -> Routing: Mode: Router In Xbox network settings I left everything as it was, automatic. I have Xbox in static DHCP/ARP/IPT router (192.168.1.1), so it gets same IP every time. When Xbox is connected like on picture above, UPnP is not working, ports are not added automatically and Xbox says "NAT Moderate". When I tried to connect to router's (192.168.1.1) wi-fi (C33-1), it worked. So it looks like via AP (192.168.1.2) Xbox is not able to open ports through UPnP, possibly double NAT? But I don't know how it's possible, I thought the AP is "transparent" to network and acting like plain switch. EDIT 1: BUT when I connect my laptop directly to AP (via wi-fi C33-2) and run Skype, UPnP works and I can see it adds some forwarded ports to router. EDIT 2: Really strange behavior... Laptop connected to C33 wifi. I run Skype, check forwarded ports and see something like: 8938 8938 192.168.1.249 UDP Skype UDP at 192.168.1.249:8938 (3631) 8938 8938 192.168.1.249 TCP Skype TCP at 192.168.1.249:8938 (3631) Laptop connected to AP via ethernet cable (just as Xbox). I run Skype, check forwarded ports and see same like above (with 192.168.1.250), BUT instead of note like "Skype UDP at ..." I see only "NAT-PMP". Now it looks like UPnP "request" can't get through, but NAT-PMP can? If you have any idea or question, please, let me know.