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[ubuntu] Network goes down after a few minutes

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linux-howto

http://ubuntuforums.org – I have a server which I've been using at home (with no problems) for about a year. I recently upgraded the memory from 2x2GB to 2x4GB and updated the operating system to ubuntu server 11.10. Following this I have network problems with the server after a few minutes. For example, if I log in immediately after power up and run ping, I get the following output $ ping 10.1.1.1 64 bytes from 10.1.1.1: icmp_req=1 ttl=64 time=0.516 ms ... 64 bytes from 10.1.1.1: icmp_req=46 ttl=64 time=0.488 ms 64 bytes from 10.1.1.1: icmp_req=47 ttl=64 time=23789 ms from 10.1.1.11 icmp_seq=123 Destination Host Unre (Hardware)