Syslinux - Feb 2025 - how to make syslinux wait till all libs are loaded over slow tftp connecton

Hello everybody,

I got a slow TFTP upload over TINC-VPN and Starlink,technically it all 
works however syslinux is giving me timeout as unable to locate 
configuration file or boot:

It does not wait till default or menu.c32 is fully loaded to the client.

Thank you in advance,

Jelle de Jong

Feb 12 01:50:14 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/lpxelinux.0 to 192.168.26.164
Feb 12 01:50:50 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/lpxelinux.0 to 192.168.26.164
Feb 12 01:51:20 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/ldlinux.c32 to 192.168.26.164
Feb 12 01:51:20 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/ldlinux.c32 to 192.168.26.164
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/ldlinux.c32 to 192.168.26.164
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/751b71d3-51a3-b78d-b0d0-acdbfdf526f7 not found
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/751b71d3-51a3-b78d-b0d0-acdbfdf526f7 not found
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/751b71d3-51a3-b78d-b0d0-acdbfdf526f7 not found
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/01-00-68-eb-dd-55-c7 not found
Feb 12 01:51:50 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81AA4 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81AA4 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81AA not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81A not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A81 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A8 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0A not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C0 not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C not found
Feb 12 01:51:51 firewall01 dnsmasq-tftp[841146]: file 
/srv/tftp/bios/pxelinux.cfg/C not found
Feb 12 01:52:20 firewall01 dnsmasq-tftp[841146]: sent 
/srv/tftp/bios/pxelinux.cfg/default to 192.168.26.164

On Wed, Feb 12, 2025 at 01:57:53AM +0100, Jelle de Jong via Syslinux 
wrote:
> Hello everybody,
> 
> I got a slow TFTP upload over TINC-VPN and Starlink,technically it all
works
> however syslinux is giving me timeout as unable to locate configuration
file
> or boot:
> 
> It does not wait till default or menu.c32 is fully loaded to the client.
Hi Jelle,

I don't think the diagnosis is quite right. There is no concurrency 
here. Syslinux does one thing at a time. It loads the config file and 
then executes it. Either it's failing to load default, or it's not 
interpreting it the way you expect. Either way, it doesn't load menu.c32 
because it doesn't execute any directive to do so.

What are the last messages displayed on the client?

-- Adam