FOG menu not showing up on some machines after DHCP server rebuild
-
@Jay-Bosworth Its been nuts here this am so it took me a while to grab the screenshot.
Capture requirements.
- Target computer, wireshark computer, and DHCP server need to be on the same subnet to capture broadcast based traffic. If any of these are on a different subnet then you will need to setup wireshark on a mirrored port to the target computer.
- If your FOG server is on the same subnet as the target computer and dhcp server you can use tcpdump on your FOG server to capture the pcap file. (hint: wireshark is not needed).
- Start your pcap capture device. for your FOG server using tcpdump you can use the following command:
tcpdump -w issue.pcap -i eth0 port 67 or port 68 or port 69or with wireshark select Capture->Options then select the proper network adapter and key the following into the capture filterport 67 or port 68
- Press the start button.
- PXE boot the target computer to the error
- Stop the wireshark/tcpdump capture.
- Analyze the pcap file.
-
I know this doesn’t technically go in here, but it is part of the process I am following to help resolve this… since I haven’t found what was causing the issues yet, I decided to take the plunge and upgrade to 1.3.0. So I am now running 1.3.0-RC-8 and when my computers boot they are stopping at a screen where it is asking for the address of the tftp server. When I type in the IP address of the FOG server it tries to connect to x.x.x.x/default.ipxe, but the connection is timing out. TFTP was working before the upgrade, is it possible the upgrade changed permissions? Any help is appreciated.
Thanks!
-
@Jay-Bosworth said in FOG menu not showing up on some machines after DHCP server rebuild:
it is asking for the address of the tftp server.
That tells me you have more than one DHCP server, and one or more are mis-configured.
-
@Jay-Bosworth What OS and what version are you running?
Also, Wayne is right, so check that out asap.
-
Ubuntu 14.04.5 LTS
I have only ever setup one DHCP server. As I stated it is a new build so the settings are exactly what is called for in the FOG setup.
Option 66 pointing to my FOG Server Option 67 pointing to undionly.kpxe
-
@Jay-Bosworth Are you sure there’s no DHCP running on your FOG server?
Check by
sudo service isc-dhcp-server stop -
unrecognized service.
-
I ran service --status-all and DHCP doesn’t even show up in the list so I don’t think it is the FOG server. It is somewhere else, still trying to figure out how I can track it down.
-
-
@Jay-Bosworth said in FOG menu not showing up on some machines after DHCP server rebuild:
I have only ever setup one DHCP server.
Then you might have a rogue DHCP server somewhere.
The fact is - the only time anyone has ever reported having to manually enter a TFTP address for FOG network booting - is when there are 2 or more DHCP servers operating on that broadcast domain, and at least one is misconfigured. And we’ve had people ask about this many times. It’s always the same case.This tool explained here would help you:
http://www.cyberciti.biz/faq/linux-unix-dhcpdump-monitor-dhcp-traffic/Or you can run wireshark on your desktop with the
bootpfilter to watch DHCP broadcasts. -
Also unrecognized, I am close to shutting down the port that the rogue DHCP server is on. I will update once that is done and I test some more.
-
@Jay-Bosworth Rogue dhcp server is confirmed? You found it?
-
Yes, I am pretty sure it belonged to the county health dept who has a satellite office in our district.
-
Thanks to all who participated in this thread. I killed the switch port that someone had a Netgear router hooked up to and everything is working fine now. FOG menu is showing up. I haven’t tried pulling down an image yet, but I have a good feeling. I will do my best to up-vote the proper answers even the earlier posts questioning the possibility of multiple DHCP servers. I had a feeling one was out there, but I didn’t think it would have a such a huge impact on FOG. Again thanks everyone for all the help!
