[syslinux] memdisk and iso, speed up

[upen]

On Fri, Jun 7, 2013 at 9:29 AM, Geert Stappers <stappers at stappers.nl> wrote:

> 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.
>
>
How does this look?

#ddns-update-style ad-hoc;
ddns-update-style none;
log-facility local7;
deny unknown-clients;
non-authoritative;
#option domain-name "example.com";
#option domain-name-servers ns1.example.com;
option subnet-mask 255.255.255.0;
default-lease-time 600;
max-lease-time 7200;
#allow bootp;
#allow booting;
option ip-forwarding    false;  # No IP forwarding
option mask-supplier    false;  # Don't respond to ICMP Mask req
server-name "dhcp209l";
next-server 192.168.0.100;
option space pxelinux;
option pxelinux.magic      code 208 = string;
option pxelinux.configfile code 209 = text;
option pxelinux.pathprefix code 210 = text;
option pxelinux.reboottime code 211 = unsigned integer 32;

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;
  option pxelinux.configfile "linux-install/pxelinux.cfg/default";
  filename "linux-install/lpxelinux.0";
  server-name "dhcp209l";
#  next-server 216.47.150.91;
  hardware ethernet 08:00:27:E7:34:E9;
  fixed-address 192.168.0.88;

I was able to stop and start dhcpd fine, with above configuration in
dhcpd.conf. I changed server-name to dhcp209l and updated /etc/hosts with
new host entry of this name with ip of eth1.





>
> Groeten
> Geert Stappers
> --
> Leven en laten leven
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-- 
upen,
emerge -uD life (Upgrade Life with dependencies)