[Techtalk] nat firewall and tftpboot

Phil Savoie Phil.Savoie at exitcertified.com
Wed Feb 7 22:08:16 UTC 2007

Hi Maria,

From a short google:

When using BOOTP / TFTP to download an image, you are limited to 640k real 
mode memory. The Boot Agent needs 128K, so you will receive this error 
message if the image is greater than 512K. Either reduce the size of the 
image you are trying to download or use a PXE service instead.

Hope this helps,


On Wednesday 07 February 2007 15:32, Maria McKinley wrote:
> I am having a very hard time getting my diskless servers to boot off the
> network. It use to work, but unfortunately, a bunch of things have
> changed, and it was impossible to change things one at a time, so I
> don't know where the problem lies. (All IPs changed, the firewall
> changed, the DHCP server changed, and I'm now using NAT, where I wasn't
> before.) I am looking for a good tutorial or how-to on setting up a
> tftpboot server, which at least mentions doing this on a network where
> there is one-to-one NAT. Anyone know of one? I've tried googling, but
> mostly get stuff for macs and bsd. I'm using debian (although anything
> based on linux would be helpful).
> thanks,
> maria
> In case someone is an expert:
> Using ethereal, I see that the client starts to receive the kernel
> packages, but after a large chunk, the tftp server requests repeatedly
> to know who has the client's ip, but the client does not appear to
> answer, and then the client boot fails with the message "Too many packages"
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Phil Savoie
Sun Training Consultant :: ExitCertified

Sun Certified Instructor :: Sun Certified System Administrator

85 Albert Street, Suite 1200
Ottawa, Ontario, Canada, K1P 6A4

[e] Phil.Savoie at exitcertified.com
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