On Thu, 2012-05-03 at 20:18 -0600, Lee Stewart wrote: > Hi... I have a customer running SLES11 SP1 and a layer 2 Vswitch. > When we did the initial install, all went well, and all the clones > behaved as expected. They did another from scratch install the other > day and it seemed to go well. But when they cloned it, they started to > have network trouble, and it ended up that they couldn't have their new > master Linux and a clone of that up at the same time -- even though they > had different IPs. > > The problem turned out to be that for some reason the new master (and > therefore it's clone) had a hardcoded MAC address (LLADDR=) in the > network definition. So even though they had different IPs, they were > trying to use the same MAC address. Removing the LLADDR= fixed the > problem and both were assigned dynamic MAC addresses by the Vswitch. > > But the question was posed -- Why was it different than the first > install? I wasn't there for the 2nd install, but they say they followed > the same steps and chose the same options. And there was no LAYER2=1 > in the network setup files. > > Anyone have any thoughts on what they might have done differently to > cause the MAC address to become fixed on the Linux side?
Lee, 1. The LLADDR settings for qeth devices have been covered in several bugzillas. yast-fixes went into SLES11 SP2. Removing LLADDR= for layer2 VSWITCH devices is definitely the correct solution. 2. The configuration for layer2 is contained in the udev-rule /etc/udev/rules.d/51-qeth-... 3. The MAC-address for a VSWITCH NIC of a Linux guest is defined within z/VM. It may change after LOGOFF / LOGON of the Linux guest. Sometimes the LLADDR= specification in Linux may accidentally match the current definition in z/VM and you do not run into network trouble this time. Regards, Ursula Braun, IBM Germany ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
