[syslinux] PXE boot hangs while transferring vmlinuz or initrd.img

[Bishop]

Michael,

Are you using 64-bit or 32- ?  We see the same thing on C5 or RHEL5, HP 
HW, 64 bit, over a large number.  32 doesn't seem to run into this 
issue.  Is yours intermittent?

 - bish

Michael Madore wrote:
> Hi,
>
> I have a user that is experiencing problems pxe booting several
> identical servers.  pxelinux.0 is from syslinux 3.63 and the TFTP
> server is 0.42 running on CentOS 5.2.
>
> After loading pxelinux.0, the client will then start transferring
> vmlinuz and initrd.img via tftp.  More than half the time, the
> transfer will get stuck and then eventually print a timeout message.
> I ran tcpdump and I can see that the server stops sending data
> packets.  The client keeps sending the last ACK until it times out:
>
> No.     Time        Source                Destination           Protocol Info
>    2456 62.303446   10.4.253.5            10.4.253.206          TFTP
>   Data Packet, Block: 1185
>    2457 62.303768   10.4.253.206          10.4.253.5            TFTP
>   Acknowledgement, Block: 1185
>    2458 62.303782   10.4.253.5            10.4.253.206          TFTP
>   Data Packet, Block: 1186
>    2459 62.304105   10.4.253.206          10.4.253.5            TFTP
>   Acknowledgement, Block: 1186
>    2460 62.304120   10.4.253.5            10.4.253.206          TFTP
>   Data Packet, Block: 1187
>    2461 62.307321   10.4.253.206          10.4.253.5            TFTP
>   Acknowledgement, Block: 1187
>    2462 65.561489   10.4.253.206          10.4.253.5            TFTP
>   Acknowledgement, Block: 1187
>    2463 72.152335   10.4.253.206          10.4.253.5            TFTP
>   Acknowledgement, Block: 1187
>
> It appears to get stuck in a random location in either vmlinuz or
> initrd.img.  The strange thing is that this only happens when booting
> the kernel and ramdisk from CentOS 5.2.  Booting the kernel and
> ramdisk from CentOS 4 works.
>
> Any suggestions for debugging this further?
>
> Thanks,
>
> Mike Madore
>
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