[syslinux] syslinux.efi pxeboot across multiple subnets

[Jason Matthews]

The same client was used for syslinux.efi (both success on same subnet and
failure on different subnet) and grub.efi. The DHCP host block is setup
like:

host testing {
    hardware ethernet {mac} ;
    next-server 10.16.195.178 ;
    filename "rhel64/syslinux.efi" ;
}

I'll pull a tcpdump filtering by the IP tomorrow when I get back to the
systems.


On Mon, Nov 4, 2013 at 6:41 PM, Gene Cumm <gene.cumm at gmail.com> wrote:

> On Mon, Nov 4, 2013 at 6:26 PM, Gene Cumm <gene.cumm at gmail.com> wrote:
> > On Mon, Nov 4, 2013 at 5:13 PM, H. Peter Anvin <hpa at zytor.com> wrote:
> >> Please indicate what version of Syslinux you are using, and also a hint
> >> at your system configuration.
> >>
> >> I presume the packet dump was taken on the server.  They indicate the
> >> client trying to initiate a TFTP transaction but apparently not getting
> >> the reply.  This *may* be the same bug that ended up in 6.02 but has
> >> since been fixed.
> >
> > In the first example, there are three requests for syslinux.efi spaced
> > ~7ms then ~2146 ms apart.  Presumably, the first two is just the
> > initial request for size/options then the real request.  I'd say the
> > EFI system either is unable to retrieve syslinux.efi (perhaps not
> > appropriately receiving the reply packet; perhaps packet loss or
> > reordering) or doesn't like something about the file.
> >
> > Was the exact same client (not just a similar client) used with
> > syslinux.efi and grub.efi across subnets?  Was this the file specified
> > in the DHCP replies or are you chainloading it?
> >
> > You'd probably be better off filtering by client IP rather than just
> 'port 69'.
>
> I seem to have missed the three requests in the success.
>
> --
> -Gene
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