For quite a while this afternoon I couldn't get it to do anything on the network at all. Although phyisically connected (via an ethernet cable I know to be good, into a hub) there was nothing - it wasn't even getting an IP address from the DHCP server amd the port light on the hub was dark, although there had been some flickering as it booted. However, running ifconfig en0 brought the correct response - the flags said it was UP, BROADCAST, SMART, RUNNING, SIMPLEX MULTICAST and mtu was 1500. The 'inet' line showed a self-assigned ip address. All the other important lines in the response - ether, media - showed 'active'.
I opened Network Utility and tried a few pings to the router. No response. Then I tried netstat, in the network Utility, and selected Display Comprehensive Statistics for each protocol, and got a long and encouraging response - eg, tcp 3249 packets transmitted, etc, and 3268 packets received, including 17 duplicate acks. Then I noticed that the light on the hub for the port it was plugged into was flickering again. I tried a few more pings and started to get intermittent responses. Then after a while the hub port light came on continuously, pinging, etc, was working everytime. Somewhere in there it had also successfully got an ip address from the dhcp server so I tried to browse the web and it was successful. And it stayed like this for a while.
Then I tried rebooting the Lombard. If I did an immediate (or nearly immediate) reboot it came up with networking functioning. If we left it for a while then networking was not working when it came back up, but (after intermittently working initially) came back later.
I'm looking for thoughts as to what might be causing this. The obvious one is that there is some sort of intermittent disconnection in the ethernet hardware, or on the motherboard. Can anyone think of any alternative reasons?
Oh, my daughter did tell me that there was thunderstorm between the time it was last working properly and the time when it wasn't. However, the Lombard was turned off (actually off, not just sleeping) during that time, although it was connected to the cable modem.
Tom
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