ASUS ROG Strix GS-BE18000 P2P Network Test

ASUS ROG Strix GS-BE18000 P2P Test: Gaming NAT and WebRTC Check

ASUS targets the competitive gaming segment with the ROG Strix GS-BE18000, a mesh router system carrying a BE18000 aggregate speed rating (688+5764+11529 Mbps across 2.4GHz, 5GHz, and 6GHz bands).¹ Each node ships with a 2.5G WAN port and seven 2.5G LAN ports. It runs ASUSWRT firmware with Adaptive QoS, AiMesh, and gaming-optimized features enabled by stock default. The Asuswrt-Merlin firmware community has requested support for the GS-BE18000, but the maintainer has not yet added it to the supported devices list as of mid-2026.²

For P2P and WebRTC, the ROG Strix GS-BE18000 defaults to cone NAT with UPnP enabled (standard ASUSWRT behavior). The STUN probe on this page confirms the active firmware configuration: consistent external ports across requests indicate cone behavior, while different external ports returned for different STUN servers indicate symmetric NAT that would require TURN for reliable P2P connectivity.

Specifications¹

NAT type and UPnP on the ROG Strix GS-BE18000

The ROG Strix GS-BE18000 uses ASUSWRT with UPnP enabled by default. ASUSWRT's default NAT filtering follows endpoint-independent behavior: the mapping is reusable across external destinations, while filtering depends on prior contact history.³ The UPnP mapping table is visible at 192.168.1.1 under WAN > UPnP, showing active port requests from LAN devices. Gaming consoles and WebRTC browsers register their required ports automatically through UPnP, and the cone NAT behavior means STUN-derived external ports remain consistent across requests. Stock ASUSWRT also provides Adaptive QoS for per-application traffic prioritization, which can reduce queuing jitter for real-time traffic when gaming or running WebRTC probes.

How AiMesh backhaul affects P2P latency on the GS-BE18000

AiMesh on the ROG Strix GS-BE18000 allows multiple ASUS routers to form a mesh network with automatic path selection for backhaul traffic. When a device connects to a satellite node instead of the primary gateway, traffic traverses the backhaul link before reaching the WAN, adding 1 to 3 ms of additional latency on wired backhaul and 5 to 15 ms on wireless backhaul depending on signal quality and band. For P2P and WebRTC applications where every millisecond of RTT matters, connecting the test device to the primary gateway node via a 2.5G LAN port produces the lowest-latency baseline. If your deployment requires the test device to connect through a satellite, quantify the backhaul contribution to RTT by running the tester once on the primary and once on the satellite, then decide whether the added latency is acceptable for your real-time application.

The backhaul contribution becomes measurable in the jitter tester when the satellite is on wireless backhaul and the signal is marginal. A 6 GHz wireless backhaul with good signal typically adds 1 to 3 ms of jitter compared to a wired connection to the primary. If you observe elevated jitter specifically on the satellite connection, run the jitter tester at different times of day; wireless backhaul jitter often correlates with neighbor Wi-Fi activity patterns, while ISP path jitter correlates with peak usage hours. This distinction helps you decide whether to invest in wired backhaul cabling or accept the wireless backhaul variance for your specific use case.

WebRTC and P2P configuration on the ROG GS-BE18000

For stock ASUSWRT on the GS-BE18000, enable Adaptive QoS and set gaming to highest priority to reduce queuing jitter. The stock firmware's cone NAT with UPnP handles most WebRTC ICE hole-punching scenarios without manual port configuration. If you need Full Cone NAT (which accepts any inbound packet on a mapped port rather than only from previously contacted addresses), you would need a router where Merlin firmware is available, since that firmware exposes the Full Cone NAT toggle in the WAN settings on supported models. On the GS-BE18000, stock ASUSWRT's restricted cone NAT still supports P2P connectivity through UPnP and STUN, but strict NAT peers may require a TURN relay for reliable connectivity.

Testing the ROG GS-BE18000 with this tool

Connect one browser to the ROG mesh network and a second to a remote connection. The STUN probe will show the WAN IP configured on the primary node. Stock ASUSWRT cone NAT produces consistent external ports across all STUN requests, confirming cone behavior.⁴ If the probe shows different external ports for different STUN servers, your router is behind symmetric NAT, which prevents reliable P2P connectivity without a TURN relay. You can verify this by comparing the srflx candidate ports returned by two different STUN servers: identical ports indicate cone NAT, different ports indicate symmetric NAT. Running the STUN probe before and after a firmware update is the most reliable way to confirm the update did not change your router's NAT classification, because even minor firmware revisions can reset advanced NAT settings to their defaults.

Merlin firmware and the ROG Strix GS-BE18000

ASUSWRT-Merlin firmware is not currently available for the ROG Strix GS-BE18000. The Merlin maintainer (RMerlin) adds new models conservatively, requiring Broadcom-based hardware, wide availability, frequent GPL releases from ASUS, and personal access to the hardware.² The GS-BE18000 is not listed on the official supported devices list as of mid-2026, though community members have requested support on SNBForums since mid-2025.

If Merlin support is added in the future, the installation would use ASUS's standard firmware update mechanism under Administration > Firmware Upgrade in the admin panel at 192.168.1.1. The process typically takes 3 to 5 minutes and the router is unreachable during the reboot window. After flashing, a factory NVRAM reset under Administration > Restore/Save/Upload Setting clears old configuration values that may conflict with Merlin's extended settings. Port forwarding and UPnP rules require re-entry because the NVRAM reset clears all saved configurations.

What Merlin would add if ported

On other ASUS routers where Merlin is available, the firmware adds a Full Cone NAT toggle under WAN > NAT Setting, per-application Adaptive QoS categories including dedicated rules for real-time media and gaming traffic, custom iptables rules, and IPv6 event logging in the System Log. All these settings are accessible through the standard admin panel at 192.168.1.1; Merlin does not change the admin panel URL or login process. Until Merlin is ported to the GS-BE18000, stock ASUSWRT provides the same baseline NAT and QoS behavior without these advanced options.

IPv6 configuration on the ROG Strix GS-BE18000 for NAT-free gaming

IPv6 on the ROG Strix GS-BE18000 is configured under WAN > IPv6 in the ASUSWRT admin panel. Select DHCPv6 as the connection type for ISPs providing IPv6 via DHCP prefix delegation; the router requests a prefix from the ISP and assigns globally routable addresses to LAN devices. With IPv6 active, gaming and WebRTC applications generate IPv6 host candidates that connect directly without any IPv4 NAT traversal.⁵

Xbox consoles support IPv6 for peer-to-peer connections, and Xbox Live P2P sessions over IPv6 bypass IPv4 NAT (showing Open NAT on the console).⁶ PlayStation 5 supports IPv6 at the console level, but most games still use IPv4 in practice. The original Nintendo Switch does not support IPv6; the Switch 2 added basic IPv6 in late 2025. When IPv6 is active and carries the connection, console NAT checks typically show Open or Type 1 because IPv4 NAT is no longer in the path.

Checking IPv6 prefix stability on the ROG Strix firmware

IPv6 prefix delegations have lifetimes and are renewed periodically by the ISP. Some ISPs change the delegated prefix on renewal, briefly interrupting IPv6 connectivity during the address changeover.⁵ If IPv6 connectivity appears intermittent on the GS-BE18000, checking the System Log under WAN > IPv6 for address changes around the interruption time identifies whether prefix renewal is causing the disruption rather than a firmware configuration issue.