Dear Juan Carlos, > Are your netmask config Ok? Can you use wireshark to sniff traffic in the > middle LANCOM <->Wireshark/tcpdump<->Xenserver and send me a trace? I couldn't make any further tests on that machine because I couldn't install any software on that machine because of the failing network. However, I took the opportunity and rebooted the machine last night. Guess what, everything is up and running again. Thanks for your assistance and sorry to the list for the disappeared problem. Reboot was no option through the week as this is a production machine under heavy load. -- Mit freundlichen Grüßen Michael Schumacher mailto:michael.schumacher at pamas.de