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 From:  Fred Wright <fw at well dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] TFTP download problem
 Date:  Sun, 13 Feb 2005 16:26:41 -0800 (PST)
On Sun, 13 Feb 2005, Gabor Riesz wrote:

> I am using Grandstream phones on a LAN behind a Soekris4521 (NAT) running
> M0n0Wall v1.2b3 connecting to the internet via ASDL-PPPOE.
> M0n0Wall works fine except that the TFTP file download (firmware refresh of
> the phones from an outside TFTP server).
>  
> The phone can't download any of the files (I can see in the TFTP server's
> log that the phone connects but the transfer doesn't start). It looks for me
> that the UDP packages from the TFTP server can't pass my router.

TFTP is not a NAT-friendly protocol.  It won't work through any NAT
implementation that doesn't have a "TFTP hack", and there's no easy
workaround.

TFTP is also a totally insecure protocol.  Anyone using it on a WAN needs
his head examined.

					Fred Wright