uml_switch is printing:
"send_sock sending to fd 4 Resource temporarily unavailable",
This is just a warning that packets are being dropped. One UML is probably pushing packets to uml_switch faster than another can dequeue them.
[...]
What should I check?
You could try changing the priorities of the UMLs with respect to uml_switch. I have my UMLs running at a lower priority than my uml_switch.
There is also a uml_switch replacement done by Gerd Knorr that has a packet queue built in that might aleviate the problem. It can be found here:
http://www.suse.de/~kraxel/uml/switch.tar.gz
Or if you are feeling adventurous, there are a couple of patch sets I posted to the devel list a while ago that among other goodies, merge Gerd's queue with the original uml_switch.
Steve Schmidtke
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