[syslinux] pxechn.c32 does not do TFTP

[Gene Cumm]

On Jul 16, 2013 8:13 AM, "Victor Sudakov" <vas at mpeks.tomsk.su> wrote:
>
> Gene Cumm wrote:
> > >>
> > >> Did you try without "-o 66..."?  Any chance for a packet capture
from a
> > >> mirrored port or the dhcpd+tftpd-old+tftpd-new+dnsd?
> > >
> > > OK, I have tried the following:
> > >
> > > label WDS
> > >  menu LABEL ^4. Windows Deployment Service
> > >  com32 pxechn.c32
> > >  append wds01-sibptus.sibptus.transneft.ru::boot\x86\wdsnbp.com  -W
> > >
> > > and it *does* work for the majority of PXE clients. The packet dump is
> > > here: http://zalil.ru/34637868
> > >
> > > You can see from the dump that the client first queries DNS for the IP
> > > address of wds01-sibptus.sibptus.transneft.ru (around frame 829) and
> > > then downloads wdsnbp.com from 10.14.140.128.
> > >
> > > This setup does not work on VirtualBox'es PXE client, perhaps because
it
> > > cannot do DNS lookups.
> >
> > Unfortunately, in my testing, I can't see any difference with and
> > without the -o.
>
> The -o in my case has turned out to be irrelevant.
>
> > The big thing I notice is just that since 5.10, the
> > code in pxelinux.0 does DNS queries for specific calls rather than a
> > dotted quad conversion first.
>
> That *was* relevant. It did not work until I replaced the dotted quad
> address with the DNS name. Thank you. I think a change in the
> documentation is due.

It's actually a bug in the core.

--Gene