[syslinux] memdisk and iso, speed up

[Geert Stappers]

Op 2013-06-07 om 06:18 schreef upen:
> On Fri, Jun 7, 2013 at 2:57 AM, Geert Stappers wrote:
> > Op 2013-06-07 om 09:35 schreef Geert Stappers:
> > > Op 2013-06-06 om 14:42 schreef H. Peter Anvin:
> > >
> > > The tcpdump[1] shows strang HTTP traffic at the end.
> > > It is TCP to port 80, but that is all. There is no HTTP  GET request.
> > >
> > > Another surprising thing was that there are many TFTP file transfers.
> > > I have expect HTTP transfers.
> > >
> > > The answers might be in the DHCP OFFER which says "server name
> > 'dhcp209'",
> > > but no DHCP option 209.
> > >
> > > I would like to see the dhcp server configuration file.
> >
> 
> ddns-update-style none;
> log-facility local7;
> deny unknown-clients;
> non-authoritative;
> option subnet-mask 255.255.255.0;
> default-lease-time 600;
> max-lease-time 7200;
> option ip-forwarding    false;  # No IP forwarding
> option mask-supplier    false;  # Don't respond to ICMP Mask req
> server-name "dhcp209";

Acknowledge


> next-server 192.168.0.100;
> 
> subnet 192.168.0.0 netmask 255.255.255.0 {
>   range 192.168.0.1 192.168.0.88;
>   option routers 192.168.0.100;
> }
> 
> host rhelclient {
>   next-server 192.168.0.100;
>   filename "linux-install/lpxelinux.0";
>   server-name "dhcp209";

That seems strange to me  ( sorry, right now, I have no time to elaborate
my gut feeling about 'server-name "dhcp209"' in "host rhelclient {}" )


>   hardware ethernet 08:00:27:E7:34:E9;
>   fixed-address 192.168.0.88;
> }
> 
> The dhcp server has two network interfaces. Eth0 -public, Eth1-Private.
> Eth1 is 192.168.0.100 and dhcpd is tied only to Eth1.
> I just realized the /etc/hosts has dhcp209 pointed to Eth0's IP address.
> Hope now this is not a major issue. Everything has been always like this on
> tftp/dhcp server.

That dhcpd config "works", what is missing is "shift to HTTP".

The (speed) advantage of HTTP over TFTP is that HTTP "streams",
where TFTP does "go, stop, go, stop, go, stop".

What is needed is 'dhcp option 209' 

See http://www.syslinux.org/wiki/index.php/PXELINUX#Can_I_send_information_to_PXELINUX_via_special_options_in_the_DHCP_response.3F 
for a clue. Yes, this terse answer is the best I can offer now.


Groeten
Geert Stappers
-- 
Leven en laten leven