Passing multiple ethernet adapters to QEMU guest

[Andrew Wood]

How do I pass more than one ethernet adapter to a QEMU guest.
Doing it like this seems to attach them both on virtual bridge br1

kvm ....  -net nic,macaddr=52:54:00:00:01:08,model=rtl8139 -net 
tap,ifname=br1p5 \
-net nic,macaddr=52:54:00:00:02:08,model=rtl8139 -net tap,ifname=br3p8

Thanks

Andrew