Syslinux - Jul 2011 - syslinux-4.10-pre15 and KVM guest booting problem

Hi,

I have a problem to report with the 4.10-pre15 branch.
The problem is that my KVM guest "just reboots" when booting off the
network.

The setup is as follows:
Host OS: RHEL 6.0/RHEL 6.1 with the default packages (no additional repos or
packages)
KVM guest configured to network boot.

(maybe irrelevant info ...) ?!?

DHCP server (using dnsmasq) in the same subnet as the KVM host.
DHCP server running on a different physical machine than that of the KVM host.
JFYI, DHCP server assigns static DHCP lease and then TFTP follows...
TFTP is configured using dnsmasq (again) :)

The TFTP server is a different physical machine (than the above two machines)


Symptom:
The guest "gets" the 'pxelinux.0' and then reboots. This
happens endlessly.

This does not occur with the 4.05-pre3 branch.

Question: What would be the best way to gather wireshark/tdcpdump dumps to
assist in
debugging this?

Should I run this from the TFTP server? (I think the TFTP server would be
better/simpler ... less noise)

I did experiment with the "host a.b.c.d" parameter of tcpdump, but
don't know if
that would be any good, so asking beforehand.

All it shows is that the pxelinux.0 file is being sent over and over ... ?!?

If the pxelinux.0 from the 4.10-xxx branch works well for the KVM guests as
well,
I can move my entire automated setup to start using only HTTP :) :)

Any help/assistance with the tcpdump (or wireshark (tshark)) commandline would
be helpful.

Thanks in advance,
Shantanu

Hey mate,

I use tcpdump to get the ethernet packets and notice something interesting.

On the target I run "tcpdump -i eth0 -e -p not ip" and run
aoe-discover on initiator then got following results from the target
side.

11:01:50.884069 52:54:00:cd:dd:fc (oui Unknown) > Broadcast, ethertype
Unknown (0x88a2), length 32:
	0x0000:  1000 ffff ff01 0000 0000 0000 0000 0000  ................
	0x0010:  0000                                     ..

And on the initiator I also can get following results.

11:04:46.752362 52:54:00:cd:dd:fc (oui Unknown) > Broadcast, ethertype
Unknown (0x88a2), length 32:
	0x0000:  1000 ffff ff01 0000 0000 0000 0000 0000  ................
	0x0010:  0000

So I think the Ethernet packets transfered well. But it seems some
magics make this unavailable. Any idea?

Eric

On 07/16/2011 09:01 AM, Shantanu Gadgil wrote:
> Hi,
> 
> I have a problem to report with the 4.10-pre15 branch.
> The problem is that my KVM guest "just reboots" when booting off
the network.
> 
> The setup is as follows:
> Host OS: RHEL 6.0/RHEL 6.1 with the default packages (no additional repos
or packages)
> KVM guest configured to network boot.
> 
> (maybe irrelevant info ...) ?!?
> 
> DHCP server (using dnsmasq) in the same subnet as the KVM host.
> DHCP server running on a different physical machine than that of the KVM
host.
> JFYI, DHCP server assigns static DHCP lease and then TFTP follows...
> TFTP is configured using dnsmasq (again) :)
> 
> The TFTP server is a different physical machine (than the above two
machines)
> 
First of all, what is the complete KVM configuration?

	-hpa