I may have found a bug in Qemu-7.0’s user-mode networking under Mac OS X (installed with home-brew).
I next tried doing a static IP address of 10.0.2.15/24 and gateway of 10.0.2.2 with dns 10.0.2.3 and it did not work either.
I finally tried installing Slackware 12.2 and also did not receive a network address: dhclient -1 returns the message “no broadcast interfaces found - exiting”. I am also getting the message "qemu-system-i386: Slirp: Failed to send packet, ret: -1” in my Mac OS X terminal window.
mfonnemann@Marks-MBP % qemu-system-i386 -nic user,model=ne2k_isa -hda linux.qcow2 -device sb16 -m 256 -cpu pentium -vga cirrus -soundhw pcspk -drive media=cdrom,file=/Users/mfonnemann/Downloads/slackware-12.2-install-d1.iso -boot menu=on
qemu-system-i386: warning: '-soundhw pcspk' is deprecated, please set a backend using '-machine pcspk-audiodev=<name>' instead