TFTP fails after 23 packets

[Paul Hedderly]

I am having a problem that Hans-Christian Armingeon had back in 2001

        http://lists.gnu.org/archive/html/bug-grub/2001-07/msg00052.html

Basically using debian Sarge grub (0.95+cvs from 20040624 and some other
patches, but none looking like they affect the tftp code)

I have a floppy with grub and a simple menu that fetches a configfile
from a tftp server which lists some options. When grub starts
downloading a kernel from the tftp server it tethereal reports:

4677.635850  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 1
4677.637453 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block: 1
4677.638638  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 2
4677.640202 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block: 2
4677.641476  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 3
4677.643042 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block: 3
4677.666726  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 4
4677.668307 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block: 4
4677.669656  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 5
4677.671271 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block: 5
... SKIPPED BECAUSE IT IS ESSENTIALLY A REPEAT
4677.716256  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 21
4677.717825 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block:
21
4677.718998  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 22
4677.720560 192.168.0.152 -> 192.168.0.3  TFTP Acknowledgement, Block:
22
4677.721804  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 23
4682.632610 192.168.0.3 -> 192.168.0.152 ARP Who has 192.168.0.152?
Tell 192.168.0.3
4682.722282  192.168.0.3 -> 192.168.0.152 TFTP Data Packet, Block: 23
4683.632480 192.168.0.3 -> 192.168.0.152 ARP Who has 192.168.0.152?
Tell 192.168.0.3
4684.632259 192.168.0.3 -> 192.168.0.152 ARP Who has 192.168.0.152?
Tell 192.168.0.3
4687.722765 192.168.0.3 -> Broadcast    ARP Who has 192.168.0.152?
Tell 192.168.0.3
4688.722585 192.168.0.3 -> Broadcast    ARP Who has 192.168.0.152?
Tell 192.168.0.3

Anyone got any ideas why? Is it a grub bug? Bios/network card bug, tftp
server bug (happens with both atftpd and tftpd-hpa) network issue?

--
Cheers
Paul