A bochs box with ethmod=fbsd, client OS's ne2k driver can not receive packet from BPF of FreeBSD in time. It causes by BPF waiting buffer, with specified size, been full. Packets are queued in buffer and client OS would not receive packets untill buffer is full (2048bytes by default). It can be fixed by asking BPF to deliver packet immediately.
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Patch applied to CVS now.