[syslinux] memdisk and iso

Gene Cumm gene.cumm at gmail.com
Thu Jun 6 13:48:57 PDT 2013


On Thu, Jun 6, 2013 at 3:48 PM, upen <upendra.gandhi at gmail.com> wrote:
>
>
>
> On Thu, Jun 6, 2013 at 1:01 PM, Gene Cumm <gene.cumm at gmail.com> wrote:
>>
>> On Thu, Jun 6, 2013 at 11:58 AM, upen <upendra.gandhi at gmail.com> wrote:
>>
>> >> This is sounding like dropped/intercepted packets.  Could we get some
>> >> details on the client (make/model of computer/motherboard, same for
>> >> NIC, PXE OROM details)?  Is it connected to the same physical switch
>> >> as the DHCP/TFTP server?  Any chance that the physical switch that the
>> >> client is connected to can perform port mirroring to see what is
>> >> received?
>> >
>> >
>> > DHCPD and TFTP server on Redhat 5.9 running as Virtualbox guest.
>> >
>> > 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev
>> > 02)
>> > 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton
>> > II]
>> > 00:01.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev
>> > 01)
>> > 00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH
>> > VirtualBox
>> > Graphics Adapter
>> > 00:04.0 System peripheral: InnoTek Systemberatung GmbH VirtualBox Guest
>> > Service
>> > 00:07.0 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 08)
>> > 00:08.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970
>> > [PCnet32
>> > LANCE] (rev 40) <----This is the one that is connected to Internal
>> > virtual
>> > switch on the server side.
>> >
>> > Client is also a Virtualbox guest.
>> > Intel UNDI - PXE-2.1
>> > 1997-2000 Intel corporation
>> > Network adapter: Intel pro/1000 T server(82543GC)
>> >
>> > I don't think how I can do port mirroring on this veritual switch but I
>> > am
>> > attaching another file tcpdump o/p and screenshot of what I see.
>>
>> I think the RHEL guest or the host's interface to this network with
>> its NIC in promiscuous mode would suffice.
>>
>> >> Any chance you could try manually copying pxelinux.0, lpxelinux.0,
>> >> ldlinux.c32, libcom32.c32, libutil.c32, libgpl.c32 and vesamenu.c32
>> >> from a freshly extracted copy of the tar (without running make at
>> >> all)?
>> >
>> >
>> > I did this some time back and then did the tcpdump and the screenshot I
>> > mentioned above and is attached here.
>>
>> Thanks.  I'm still trying to see if there's any way to translate that
>> to PCAP format (ie tcpdump's -w _file_ option).  Using tcpdump with -A
>> I presume?
>
>
> Me not sure either how that could be translated.
> I have now attached file with packets captured running tcpdump -w filename.

Supposedly text2cap could do something but not sure.  Thanks.

--
-Gene


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