Robert Schuettler schrieb am 27. Jul 2010 um 00:33:45 CEST:
> * Michael Blinn <[email protected]> [2010-07-18 09:10]:
> > Thank you - but no. "2nd DHCP address" refers to the 2nd time the one card
> > does a DHCP request. As I understand it, the first is for TFTP, the 2nd is
> > when we bring up the network interface.
>
> The second one is done from "within" the initrd, when the actual Linux
> system (kernel + stuff on the initrd) is running and asks for an IP
> address. This means that sometimes the 1st (PXE) DHCP request works well and
> then the 2nd one doesn't because
> 1) there's no driver for the network card or
> 2) there are 2 network cards and the Linux system does the request from
> the wrong one or
> 3) there's a DHCP relay involved and the request goes out via DHCP client
> strangely so that the relay doesn't work, or ...
We mostly have 2 NICs in our thin clients and case 2) happens from time to
time. The kernel (udev) decides to make the PCI-NIC sometimes eth0 and
sometimes eth1, but usually it keeps this decision between reboots.
You simply pass the kernel the option to use eth1: IPOPTS=:::::eth1
I created a file /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/eth1 with this
contents:
DEFAULT vmlinuz ro initrd=initrd.img quiet splash IPOPTS=:::::eth1
Then you have to link the booting client to this file. There are different
methods, I prefer the hex representation of the clients IP number:
decimal: 10.1.1.249 hex: 0A0101F9
And then: ln -s eth1 0A0101F9
A little perl script does this converting for me. I can post it if you are
interested.
HTH
Helmut
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Helmut Lichtenberg <[email protected]> Tel.: 05034/871-128
Institut für Nutztiergenetik (FLI) 31535 Neustadt Germany
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