Can you try 'info network' on the QEMU monitor (Ctrl+Alt+2)? You should get something like this:
VLAN 0 devices: user.0: net=10.0.2.0, restricted=n e1000.0: model=e1000,macaddr=52:54:00:12:34:56 Devices not on any VLAN: QEMU's user networking will not provide the DNS and gateway information if restricted=y. Stefan
