Extrems
If the in-game network stack catches a ARP reply for the server's IP address from another client within the allotted time, it'll pick up its associated MAC address. So it's...
This was technically requested in #719.
You need layer 2 bridging. Docker will not work, period.
I recommend the [official](https://fsp.sourceforge.net/) fspd on either a baremetal or virtual machine (that isn't Docker), in a FreeBSD jail with VNET (TrueNAS), or using [RetroNAS](https://github.com/danmons/retronas) (Raspberry Pi 4 minimum requirement).
Make sure whatever SBC you use doesn't have a USB-based Ethernet controller. The FSP client is very sensitive to latency for good throughput.
Using a packet size larger than 1460 is no longer recommended and will only work if the server supports jumbo frames.
I think you might have a broadcast storm problem. The BBA only has a 2 KiB receive buffer and a slower interface than the actual Ethernet link, so it's prone...
It's not necessarily traffic targeted at the GameCube, but everything on the local link. Like ARP, DHCP, STP, mDNS, various neighbor discovery protocols, etc.
Fixed in c8ac3fc (r1443).
Ah, there's a checkbox on the right side labeled "Allow edits by maintainers". I just rebased it and resolved the conflicting changes. I still need to review it properly.