@TomasRajz This depends on the router model hardware capabilities (CPU, Memory). Usually this is a decision of the TP-Link development team and probably only a TP-Link representative can answer your...

@mertyalibagi According to this post NAT loopback doesn't work on VR300.

@TomasRajz This error usually comes up when the number of entries exceeds the limit in its context. You can't increase the number of the entries because it's harcoded in the router firmware.

@Mordep Other than reset the Archer C6 to its factory defaults and if the issue still persists testing with another power supply (12 V ⎓ 1 A) there's nothing you can do more. By the way, If the...

@Kiezelke Most probably yes. For static IP's you can use DHCP address reservation feature.

@Evil1nside That's exactly the case - check this post.