[syslinux] tftpd-hpa source port selection

[H. Peter Anvin]

Alexandre Aractingi wrote:
 >
> Hi, the topic has been covered before so I won't ask how the source port
> selection is done, but I'm wondering why (and this doesn't concern
> tftpd-hpa only but more the tftp protocol itself) the server couldn't
> respond with the UDP source port 69, as a 'regular' server would do...
> (ie Apache listens on TCP 80, and replies with TCP source port 80)
> Thanks for any light on this,
> 

The TFTP protocol behaves this way to make it easy to implement on 
machines even with really bizarre UDP stacks.  Whether or not it 
actually is a win is probably at best debatable, however, there *are* 
machines which don't handle a connected and an unconnected UDP socket 
with the same local port number.

	-hpa