Archive for January 21st, 2013

Tip: Wake on LAN/Magic Packet information collection and check list

Monday, January 21st, 2013

Hello,

very often i’ve been asked related to Wake On LAN and mostly people are not getting it to work. Please note: WoL/Magic Packet’s is a technology created by AMD and not IGEL!

Setting up WoL mostly requires good networking skills and the right infrastructure, so you have to figure this out: There is no “general” tip or configuration at all!

Here are some good 3rd Party information sources:

http://en.wikipedia.org/wiki/Wake-on-LAN (english)
http://de.wikipedia.org/wiki/Wake_On_LAN (german)
http://support.amd.com/us/Embedded_TechDocs/20213.pdf (AMD Tech Specs for Wake on LAN)
http://technet.microsoft.com/en-us/library/bb932199.aspx ( Troubelshooting WoL-Microsoft Technet)

Checklist for WoL:
1) In general make sure that WoL/Magic Packet’s are supported by “ALL” of your network devices like routers and switches.
2) Do not hard power off your devices (power disconnect), by definition WoL will not wake up a device after a hard power off!
3) WoL do not work thru WiFi (WoL is pre-WiFi time), for VM’s and/or devices with an Intel 10GB network card (not supported by Intel)!
4) Play around with the Wake on LAN configuration in the IGEL UMS Administrator or for Universal Desktop LX/OS you can also perform some configuration task thru System->Registry->network.interfaces.ethernet.device0.wol. Attention: Make sure what you’re configuring, otherwise the device will be powered on very often… 😉
5) Make sure the ARP cache/table (for Switches/Routers)  is large enough, typical symptom: Wake on Lan is working for a few hours after the device is (soft-) switched off, then it doesn’t work anymore from one second to an other. Cheap retail switches mostly provide a very limited ARP cache and/or high end switches needs to be configured in the right way to handle this.

Dealing with Wake on Lan is tricky and you should figure out which component’s are creating the issue but in 99,99999% it’s not the (IGEL) end device!

Cheers
Michael

Tip: Windows ES/ES W7 loosing login script mapped user drives if a domain is joined

Monday, January 21st, 2013

Hello,

if you’re using a Windows based IGEL Client in a Domain it happens that mapped User Drives are lost after a few seconds, to prevent this disable in the IGEL Setup / Profile->System->Registry network.usesmbmountconfig

After this setting is disabled the mapped user drives will be not removed anymore.

Cheers
Michael

Tip: Automatic start/restart for IGEL Universal Desktop LX/OS without IGEL UMS or wake on lan

Monday, January 21st, 2013

Hello Folks,

sometimes it’s not possible to use wake on lan or the IGEL Universal Management Suite to start a client in the morning.. So what can you do in a case like this?

There is a nice Linux command called “rtcwake”, the “rtcwake” command can control the BIOS in combination with the real time clock in your device to perform some power management actions here.

For example the command rtcwake -m mem -s 10 will suspend the device for 10 seconds and then the device is back in action, it’s only one sample. To use the command to start the client at a specified time just enter something like rtcwake -m no -l -t $(date +%s -d ‘tomorrow 07:50’)

The mentioned command will configure everything and perform a system restart “tomorrow” at 7:50am, be aware this sample is not able to handle the weekend! Of course you can play around with this command, there is a good description available here: http://www.howtogeek.com/121241/how-to-make-your-linux-pc-wake-from-sleep-automatically/

I’ve tested this with the IGEL UD5 and a Universal Desktop migrated PC but it can be that this will not work on all migrated devices because the hardware needs to support it (ACPI compliant). It will also not work if you disconnect the device from power!

To use this i recommend to setup a cron job (running Monday-Thursday), see also here: http://blog.cloud-client.info/2012/10/03/tip-running-a-scheduled-job-on-an-igel-universal-desktop-lx-os-without-a-management-server/

You can also use this by using the IGEL Setup->System->Firmware Customization->Custom Commands->Desktop Commands->Custom Command Desktop Final or as seperate command/script but please be aware: In this case you have to take care for the weekend’s.

Have Fun
Michael

P.S.: Use this on your own risk!

Update: IGEL Universal Desktop LX/OS Quick Command Reference

Monday, January 21st, 2013

Hello Folks,

a new version of the IGEL Universal Desktop LX/OS Quick Command Reference is available here: http://www.cloud-client.info/whitepaper

Cheers

Michael