OK, I think I've got it now. I found
http://blog.cynapses.org/2007/07/12/qemu-kvm-internal-network-setup/
which provided some additional settings for the -net options.
Using a made-up mac address and -net tap,ifname=tap0,script=no gave me
an IP address from my local network and allowed Windows Update to locate
8 updates. However, I still couldn't browse the Internet, which was
confusing. Moreover, network operations seemed slow.
Including model=rtl8139 seems to be important. Once I did that, I could
get out onto the Internet.
The kvm networking page doesn't mention these essential command line
settings. Perhaps you could ask the page maintainer to include them?
I'd do it myself but I'm still having a network issue - br0 doesn't come
up when I boot - I have to start in single-user mode, run dhclient br0,
then resume the boot. I don't feel comfortable offering people network
advice when I'm having a basic problem like that. :)
Thanks for your help!
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