I am also encountering the same issue, and your description really resonated with me because I’ve run into nearly the exact same situation when trying to host group C&C games through CnCNet on a shared network. Everything works perfectly when one or two devices are connected, but as soon as multiple players try to join in from the same Wi-Fi, the connectivity becomes unstable, with frequent lag spikes and disconnections. The strangest part is that the rest of our internet usage streaming, browsing, or even other multiplayer games runs without any hiccups, which makes it even more confusing to troubleshoot.
In my case, I’ve noticed that it seems to be tied to how CnCNet handles peer-to-peer traffic and port assignments. When multiple clients are sitting behind the same router, the NAT and port forwarding can clash, causing packets to get dropped or misrouted. I’ve tried tinkering with router settings like enabling UPnP, manually forwarding ports, and even separating devices onto different SSIDs, but the results have been inconsistent at best.
I’m beginning to think this is less of a raw bandwidth problem and more of a network configuration/NAT traversal issue. Some folks have suggested that using wired connections instead of Wi-Fi, or assigning static IPs to each device and matching them with unique port rules, can reduce conflicts. I’ve also heard that using a VPN configured for each device can sometimes bypass the local NAT issues, but I haven’t tested that thoroughly yet. Please assist as I am not a techie