[K12OSN] Guidance on troubleshooting - new RHEL6 + LTSP won't PXE

Josh Malone jmalone at nrao.edu
Wed Nov 23 21:33:02 UTC 2011

On 23.11.2011 16:11, Shawn Wells wrote:

> Per the instructions I configured ltspbr0 and tried to PXE boot the
> VM which is acting as the thin client... no luck.  My config is just
> two VMs for testing purposes.
> I receive the following error:
> PXE-E51: No DHCP or proxyDHCP offers were received.


> After failing to PXE boot I loaded an OS on the thin client and was
> able to ping, so it doesn't appear to be a 
> connectivity
> issue.

So, your clients in "fat mode" can get a DHCP address, but PXE clients 

> I went ahead and rebooted my server, then tried to PXE again.  No 
> dice.
> I ensured DHCP is running and listening for connections:
> # chkconfig --list | grep dhcp
> ltsp-dhcp	0:off	1:off	2:on	3:on	4:on	5:on	6:off
> # service ltsp-dhcp status
> dhcpd (pid 1920) is running...
> $ netstat -an | fgrep -w 67
> udp	0*

If dhcpd is running, have you checked to make sure it's listening on 
the right network interface? Tcpdump may be your friend here.

> I then ensured tftp was running and enabled

Your problem is before TFTP.

I'm sorry I'm not much help here. In my case, I'm not using the LTSP 
server as the DHCP or network router/nat; my clients are on my internal 
network just like any other host, receiving dhcp addresses from my 
network's existing DHCP server. I'm not completely sure I understand the 
ltspbr0 function.


        Joshua Malone       Systems Administrator
      (jmalone at nrao.edu)    NRAO Charlottesville
         434-296-0263           www.nrao.edu
         434-249-5699 (mobile)

BOFH excuse #427: network down, IP packets delivered via

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