That comment about e1000 is only true for qemu-system-i386. For ARM machines, there are other default NICs. You should also not mix "-net" and "-device", see https://www.qemu.org/2018/05/31/nic-parameter/ for some details. And concerning NAT, yes the "user" backend is using NAT, see https://wiki.qemu.org/Documentation/Networking#User_Networking_.28SLIRP.29 for details about that.
That comment about e1000 is only true for qemu-system-i386. For ARM machines, there are other default NICs. You should also not mix "-net" and "-device", see https:/ /www.qemu. org/2018/ 05/31/nic- parameter/ for some details. And concerning NAT, yes the "user" backend is using NAT, see https:/ /wiki.qemu. org/Documentati on/Networking# User_Networking _.28SLIRP. 29 for details about that.