MDNSResponder problem / network traffic reduction measures in effect

[Part I in a series of "Why Does My Machine Randomly Shut Down And Related Oddities" :-D ]
Below you can see a bunch of log output which seems to show a network problem. My connection is not too fast, which I've blamed on my low tier of U-Verse, but this makes me wonder. And it seems to occur each wakeup.
"network traffic reduction measures in effect" I've found mentioned as an AirPort problem.
BUT, my AirPort is OFF.
(Plus, why is it changing the host name and then back again?)
Mar 1 08:41:43 al-pines-imac-g5 kernel[0]: System Wake
Mar 1 08:41:43 al-pines-imac-g5 kernel[0]: Wake event 0020
Mar 1 08:41:43 al-pines-imac-g5 kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x41e1,0x0007)
Mar 1 08:37:49 al-pines-imac-g5 configd[36]: setting hostname to "al-pines-imac-g5.local"
Mar 1 08:41:43 unknown000D93C8E73A configd[36]: setting hostname to "unknown000D93C8E73A"
Mar 1 08:56:49 unknown000D93C8E73A kernel[0]: IOPMSlotsMacRISC4::determineSleepSupport has canSleep true
Mar 1 08:56:50 unknown000D93C8E73A kernel[0]: System Sleep
Mar 1 09:06:10 unknown000D93C8E73A kernel[0]: System Wake
Mar 1 08:56:50 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:10 unknown000D93C8E73A kernel[0]: Wake event 0020
Mar 1 08:56:50 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:10 unknown000D93C8E73A kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x41e1,0x0007)
Mar 1 08:56:50 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 08:56:50 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:10: --- last message repeated 1 time ---
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:10: --- last message repeated 2 times ---
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 22: Error 50 Network is down
Mar 1 09:06:03 unknown000D93C8E73A mDNSResponder[24]: ERROR: mDNSPlatformTCPConnect - connect failed: socket 9: Error 50 Network is down
Mar 1 09:06:11 al-pines-imac-g5 configd[36]: setting hostname to "al-pines-imac-g5.local"
Mar 1 09:06:11 al-pines-imac-g5 mDNSResponder[24]: Note: Frequent transitions for interface en0 (192.168.1.67); network traffic reduction measures in effect
Mar 1 09:06:26 unknown000D93C8E73A configd[36]: setting hostname to "unknown000D93C8E73A"
Mar 1 09:09:08 unknown000D93C8E73A ntpd[14]: time reset +2.174483 s

Is that an actual dump from your logs? If so, I find it strange - not least because the timestamps are not consecutive. That certainly makes it harder to trace what's going on.
Deciphering it as best I can, I'd say you have a flaky network. This could be due to cabling or some process on the machine that's interrupting sleep - I find it strange that many of the mDNSResponder messages are timestamped while the machine is asleep. That could be related to the various wake-on-LAN options - are they enabled in System Preferences -> Energy Saver?

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    Every Robot runs about five scripts, which are executed every ten minutes. Therefore every robot exectues 30 scripts in one hour.
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    So I start measuring the network traffic. I observed the connection with Wireshark:
    The robot uses in average 4000 Byte per second, which equates to 9,66 GByte for one month.
    After stopping every script and rebooting the robot, I measured the traffic again.
    The robot uses without executing a script in average 820 Byte per second, which equates to 2 GByte for one month.
    Are there some settings I overlooked, possibilities to decrease the network traffic? 
    Is that size of network traffic within the normal range?
    Regards
    Alex
    Edited by: Alexander Beck on Jan 11, 2012 10:57 AM

    Hi  Beck,      
    I am also working on End user experience monitoring.
    I want to in depth details in End User Experience Monitoring. If you have screen shots please share for me.
    Regards
    Balaji
    Edited by: Balaji Rao Bhoomraogari on Jan 18, 2012 12:19 PM

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