Network configuration.

[peter]

Hi,

This command produces error reply "qemu-system-i386: Invalid parameter 'net'".

qemu-system-i386 -drive file=$Sysdev,format=raw \
  -netdev tap,id=n1,ipv4=on,ipv6=off,net=172.23.8.0/24,host=172.23.8.2 \
  -device ne2k_pci,netdev=n1

Therefore try this.  The intention is qemu host 172.23.8.1 and qemu 
guest 172.23.8.2.  (Note the ambiguity of "host".)

qemu-system-i386 -drive file=$Sysdev,format=raw \
  -netdev user,id=n1,ipv4=on,ipv6=off,net=172.23.8.0/24,host=172.23.8.2 \
  -device ne2k_pci,netdev=n1

A working guest system is produced.  Good. 

The qemu host tries to make an interface for the 
subnet to the guest.

grep 8.1 /etc/network/interfaces
     address   172.23.8.1

Check whether the interface is created.

ip addr show | grep 172.23.8.1
ip addr show | grep 172.23.8.2

No result from either.  

Q1. Why does qemu fail when a tap device is specified?

Q2. When qemu succeeds to make a guest system, why does 
    it fail to make the interface with address 172.23.8.2?

Thanks,               ... Peter E.

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Tel: +1 604 670 0140            Bcc: peter at easthope. ca