[Qemu-devel] Re: VM with two interfaces

[Stefan Hajnoczi]

On Thu, Oct 21, 2010 at 11:49 PM, Nirmal Guhan <address@hidden> wrote:
> On Thu, Oct 21, 2010 at 9:23 AM, Nirmal Guhan <address@hidden> wrote:
>> Hi,
>>
>> Am trying to create a VM using qemu-kvm with two interfaces(fedora12
>> is the host and vm) and running into an issue. Given below is the
>> command :
>>
>> qemu-kvm -net nic,macaddr=$macaddress,model=pcnet -net
>> tap,script=/etc/qemu-ifup -net nic,model=pcnet -net
>> tap,script=/etc/qemu-ifup -m 1024 -hda ./vdisk.img -kernel
>> ./bzImage-1019 -append "ip=x.y.z.w:a.b.c.d:p.q.r.s:a.b.c.d
>> ip=x.y.z.u:a.b.c.d:p.q.r.s:a.b.c.d root=/dev/nfs rw
>> nfsroot=x.y.z.v:/blahblahblah"
>>
>> On boot, both eth0 and eth1 come up but the vm tries to send dhcp and
>> rarp requests instead of using the command line IP addresses. DHCP
>> would fail in my case.
>>
>> With just one interface, dhcp is not attempted and nfs mount of root works 
>> fine.
>>
>> Any clue on what could be wrong here?
>>
>> Thanks,
>> Nirmal
>>
> Can someone help please? Hard pressed on time... sorry

Try the #qemu or #kvm IRC channels on chat.freenode.net.  Often people
will respond and debug interactively with you there.

Your problem does not seem QEMU/KVM related.  You'll need to debug the
guest's boot process and network configuration just like a physical
machine.  In fact, I bet with an identical setup on a physical machine
you'd see the same problem.

Double-check the kernel parameters documentation.
See if you have a network configuration in the initramfs or the root
filesystem that would cause it to DHCP and how to pull the
pre-configured settings from the kernel.

Stefan