[rhelv6-list] virt-install --pxe REVISIT

[Derek T. Yarnell]

Hi Phil,

Just a question are you sure you have your sysctl parameters and/or
iptables right?

eg.

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

and/or

-A FORWARD -m physdev --physdev-is-bridged -j ACCEPT

I have our bridged (underlying eth device with then a vlan tagged device
on top joined to a bridge which used with qemu) setup working on RHEL6
now with no real changes from our RHEL5 setup (puppet recipe).  Although
I have jettisoned NetworkManager because i loath it.

Thanks,
derek

On Fri, 2010-11-12 at 10:47 -0700, Phil Meyer wrote:
> Pleas guide me as to where and/or who would work this bug:
> 
> Fedora 12+ and RHEL6 both suffer this issue.
> 
> I would speculate that all systems that ship a reasonably new version of 
> qemu featuring the seabios suffer from this issue.
> 
> Here is a sample virt-install that works on servers with older (not 
> seabios) versions of qemu.
> 
> virt-install \
> --noreboot \
> --hvm \
> --virt-type=kvm  \
> --name=a008474 \
> --ram=1024 \
> --vcpus=1 \
> --arch=x86_64 \
> --uuid=ff1507df-2f77-4618-b9d6-8c9b27e6528f \
> --os-type=linux \
> --os-variant=rhel6 \
> --disk path=/dev/mapper/008474,bus=virtio,cache=none 
> --network=bridge=br1,model=virtio,mac=52:54:ac:14:21:04 \
> --pxe \
> --vnc \
> --vnclisten=0.0.0.0 \
> --noautoconsole \
> --wait=-1
> 
> We are really only interested in the affect of calling: --pxe
> 
> If the libvirt provided NAT interface is used, it works.
> 
> If a bridge is set up and (as in the above example) is used for the VM, 
> the dhcp request shows up on the vnet assigned to the guest, but never 
> to the bridge.
> 
> ie:
> 
> # tshark --i vnet0
>       Always shows the dhcp request.
> 
> # tshark -i br0
>       Never shows any packets from the guest.
> 
> However:
> 
> If you press <CNTRL>b to drop into the gpxe BIOS before it aborts, 
> manual processing does indeed work.
> 
> gpxe> dhcp net0
>      WORKS!
> 
> By entering imgload, etc. manually, the PXE boot can work.
> 
> Very strange.
> 
> Any advice is welcome.  This is a show stopper for us.
> 
> Thanks!
> 
> _______________________________________________
> rhelv6-list mailing list
> rhelv6-list at redhat.com
> https://www.redhat.com/mailman/listinfo/rhelv6-list
> 

-- 
Derek T. Yarnell
University of Maryland
Institute for Advanced Computer Studies