[syslinux] PXELINUX gets stuck when receiving non-PXE traffic

[Ady Ady]

> the PXELINUX log line is
> printed (PXELINUX 6.04 lwIP 6.04-pre3 Copyright (C) 1994-2015 H. Peter
> Anvin et al),

(snip)

FWIW, the official binaries from 6.04-pre2 and 6.04-pre3 are not good 
for troubleshooting.

Is the same behavior present when testing with other versions? I would 
suggest trying 6.04-pre1, and/or the binaries from Debian Sid / 
Unstable (which are more up-to-date than official upstream 6.04-pre1). 
Please note that you need to replace _all_ binaries (e.g. *.c32), not 
just lpxelinux.0, from the same exact build/version/package.

Regards,
Ady.