I had some issues with getting archiso to boot over the network because i couldn't get archiso.img initram to setup my network correctly, escpecially i haven't found a way to configure dns servers. As i cat see in archiso_pxe_common, there's no support for ip=dhcp or ip=<devname> to do dhcp configuration of the interfaces. Only format supported is ip=<address>:<server>:<gateway>:<netmask>. If no ip= argument is present, when pxe hooks do nothing.

nslookup from ipxe helps a bit, but i would be nice, to have support for ip=dhcp and ip=<device> or at least a way to provide a nameserver for resolve.conf.