Guest can send packets but never receives anything

Guest can send packets but never receives anything: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm trying to get networking working in a Linux guest booted by gokvm, using the tap device that gokvm sets up. The outbound direction looks fine — anything the…

The task

I'm trying to get networking working in a Linux guest booted by gokvm, using the tap device that gokvm sets up. The outbound direction looks fine — anything the guest sends (ARP, DHCP discover, ping, etc.) shows up on the host's tap interface when I `tcpdump` it.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.