Ethernet failure

My built-in ethernet recently stopped working. I changed cables, attempted connecting via cables that were working well for other machines, rebooted routers, hubs, my machine etc- even ran disk utility on my machine. No luck. (I can still connect via wireless but cannot get to Appletalk printers/ervers on the local network. That may be resolvable through tweaking settings on the wireless router. However, that's not today's issue). Assuming at this point that the internal Ethernet port had met is death, I then purchased a D-Link ehternet PC card and loaded the software etc. It performs the same as the built in ethernet which is that is self-assigns itself an IP address , but never gets one from the router and does not ever show the router address in the network control panel. Changing IP addresses to manual and filling in the settings gives me a green light on the network status page (this is true for the built-in and the D-Link card), but no actual internet access.
This leads me to believe there is some system level corruption possibly at work here. If the internal card was toast would not the D-Link card solve that problem? Why can I get an IP address via wireless but not ethernet? Any ideas out there would be greatly appreciated.

This is thread purports to have a solution to the Ethernet problem being reported in this forum. Haven't had a chance to check it out yet, but thought I'd post a link for others to see:
Supposed Ethernet Fix
They say shutting the PowerBook down, unplugging power and removing the battery for 10 and then resetting the PMU seems to solve the issue. Hope so!

Similar Messages

AP1252AG Power Injector - Ethernet Failure Radios still UP

Hi All,
please can somebody help?
I was doing a simple test today with 2 AP's, both AP's are powered by Cisco Power Injectors. I was expecting that my client would simply switch association from one access point to another if I disconnected the ethernet cable of one AP (breaking the network connection). What I noticed was that the Radio's of the AP which has it's ethernet cable unplugged were still authenicating clients. i.e clients were authenticaing with radios of AP which has it ethernet interface down.
Please can somebody tell me whether there is a command that will cause the radios to shutdown in case of ethernet failure, thus forcing clients to try to find another AP
Regards

Hi,
Thanks for reading my post, I've found the command, which shuts down the radio if the ethernet goes down:
ap(config)#interface dot11Radio 0
ap(config-if)#station-role root fallback shutdown
ap(config-if)#end
ap#
ap#
ap#sh ip inter brie
Interface IP-Address OK? Method Status Protocol
BVI1 XXX.XXX.XXX.XX YES NVRAM up up
Dot11Radio0 unassigned YES NVRAM up up
Dot11Radio1 unassigned YES NVRAM administratively down down
GigabitEthernet0 unassigned YES NVRAM up up
ap#
Unplug the Ethernet cable from Switch
*Mar 1 00:08:28.523: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0, changed state to down
*Mar 1 00:08:28.527: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Mar 1 00:08:29.527: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Mar 1 00:08:30.527: %LINK-3-UPDOWN: Interface BVI1, changed state to down
*Mar 1 00:08:31.527: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to down
ap#
ap#sh ip inter brie
Interface IP-Address OK? Method Status Protocol
BVI1 XXX.XXX.XXX.XX YES NVRAM down down
Dot11Radio0 unassigned YES NVRAM reset down
Dot11Radio1 unassigned YES NVRAM administratively down down
GigabitEthernet0 unassigned YES NVRAM up down
ap#
Plug Ethernet Cable back into Switch
*Mar 1 00:08:56.975: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0, changed state to up
*Mar 1 00:08:56.983: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up
*Mar 1 00:08:57.979: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Mar 1 00:08:58.983: %LINK-3-UPDOWN: Interface BVI1, changed state to up
*Mar 1 00:08:59.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to up
ap#sh ip inter brie
Interface IP-Address OK? Method Status Protocol
BVI1 XXX.XXX.XXX.XX YES NVRAM up up
Dot11Radio0 unassigned YES NVRAM up up
Dot11Radio1 unassigned YES NVRAM administratively down down
GigabitEthernet0 unassigned YES NVRAM up up
ap#
This Works....
Regards

H520 ethernet failure

Hi,
My H520s recently developed an issue with its ethernet connection. My configuration is that I have a Netgear Gigabit switch between my modem/router and the Lenovo H520s machine. The H520s is running Windows 8.1 (upgraded from Windows 8).
The problem suddenly appeared that the ethernet connection will connect - then after < 10 seconds it will declare that the network cable is unplugged and reconnect - then last for < 10 seconds again and repeat, so the wired connection is effectively useless.
I have tried another machine (netbook) using the same ethernet cable and it stays healthy.
If I tell the network device in the H520s to set its speed to 10 or 100 M, then the H520s maintains its connection - so it is usable if I am willing to accept the downgrade in local traffic speed.
Has anybody experienced this?
Does it sound like a simple hardware failure?
I am a little reluctant to go and update drivers after a fiasco I had last time (the driver I have is provided by Microsoft, dated 10/05/2013). Are the latest drivers trouble free?
Thanks in advance,
Keefe

Welcome to the Lenovo Community !
I'm not an owner of your model, but the first step I would try in resolving the problem would be to uninstall the ethernet driver, reboot the computer and then install a fresh copy. It is possible that there is some corruption with the currently installed drivers.
In the event you feel that your on-board ethernet is failing you can always install a PCI-e ethernet card provided you have an available slot for it and just disable the on-board ethernet controller in the BIOS.
Owner & Operator of the following:
● Lenovo Ideapad Z570 w/ Win 7 & Win 8.1 Dual Boot ● Lenovo Yoga 3 Pro w/ Windows 8.1 ● Toshiba A75-S206 w/ Win 7
● IBM Thinkpad T-23 w/ Win XP ● IBM Thinkpad T-22 w/ Win XP • As well as multiple desktops dual/triple booting XP, Vista and Win 7.
★ Find a post helpful? Thank that member by clicking on the ☆Star☆ to the left awarding them a Kudo.
★ Posting a problem and a reply is helpful and it answers your question, please mark it as an "Accepted Solution"
★ I'm not a Lenovo employee, just a volunteer geek who likes to help folks. Enjoy your time here, pay it forward by helping others !
★ Sorry, I don't answer questions via Private Messages. Posting in the appropriate forum is the best way to get assistance.

Another Ethernet failure?

Hi everyone
I've read a few posts in this iMac forum about Ethernet problems. I also took to heart the comment by one poster: network problems are solved by 'divide and conquer'.
For a couple of months, I've been cursing our isp here in Portugal for a gradual slowdown in Internet speed. We had engineers in to fix one problem with the line, but my connection remained slow. However, over the past couple of days I've determined that this is actually a problem with my main machine (iMac G4, 1.25GHz).
An iBook connected by cable to my Conceptronic ADSL router runs nice and fast. I record a surprisingly good 3.2 Mbps using www.speakeasy.net/speedtest.
My iMac shows poor modem speeds on the same test: 40-50 kbps. With Appleshare over the Ethernet (100MB) it was going to take 30 hours to copy a 500MB file. This is very slow -- and things used to be better. It looks like there is a problem with my Ethernet hardware or, perhaps, a general speed problem with the iMac.
I've reformated the HD and reinstalled system software (10.3.x and 10.4.x) and the problem remains.
My question is: what is the likelihood that the iMac's networking systems would partially fail in this way? And how can I test for failures of this type? I live in rural Portugal and the thought of finding a good Mac repair shop leaves me cold At very least I'd like to be able to approach a shop well-armed with information. I've used Net Monitor to show that Ethernet activity goes in bursts with longish (a second or so) periods of no data transfer at all.
Has anyone seen anything like this before?
Tks
Steve

OK. I've learnt some more about this problem. It looks like it's something to do with my iMac not playing well with the router (Conceptronic C54APRA). If I place a switching hub between my iMac and the router, voila I'm back up to speed (3000+ Mbps). It's a workaround (especially as my hub is originally from Japan and I need a transformer to run it here in Portugal). But a lot nicer than a new computer
I know very little about the complexities of Ethernet. How can this be? Are there settings I can make in my router or system to get these two to play better? Or should I just give up (and perhaps get an Airport card for the iMac and dispense with all the wires once and for all...
I'd appreciate any hints!
Steve

DHCP not issuing IP System Preferences/Ethernet failure

I have 10.4.6 running a dhcp connection and it stopped recognizing my ethernet connection one day. I have troubleshooted it and zapped pram not been able to get it to recognize when my ethernet is plugged in or system preferences to recognize ethernet as an option, even when I configure it to.
I see this is pretty common. Does anyone know what to do?
Thanks
David

Since I just got through installing a replacement NIC for a customer, because lightning took out his factory ethernet interface, I thought I might share.
We knew lightning had struck, because all of the network devices were disabled. On the Mac that got damaged, the ethernet interface failed to appear in the hardware list of the System Profiler.
If you're not seeing any adaptor, and you're reset the PRAM, then it's possible your adaptor was damaged by external forces. Could even be from a static discharge. In that case; for $5, you can install a new network interface card (NIC). Be sure to read Tim's posts about generic cards that are supported by Apple's standard drivers (don't require a driver).
Then again, you may have a completely different problem!

Ethernet failure:lightning strike

hello
my first post...is there a pci slot ethernet card that will work with my G4.
lightning zapped my ethernet connection and also my partners PC,but she got a new card for £5.00
otherwise its a new logic board.
regards

Get yourself a Surge supressor that has Ethernet dataline protection. I use an APC Back-Ups 750. Ever since I installed that between my cable modem and my broadband router, I haven't had a single piece of hardware die on me (Knock-on-wood...)
Of course all my PC's and my Cable Modem, Router, and Switch all are connected to APC battery back-ups for power as well.

Ethernet card issue...can't get rid of self-assigned IP

Hi folks,
I am using an circa 2005 iMac G5 PPC desktop with 10.5.8. I am trying to connect the iMac to my Time Capsule via ethernet cable, but seem to be having problems with my ethernet card. When I plug into the TC ethernet port, the TC drive, does not mount and I cannot access the worldwide web.
When I go to System Preferences --> Networking, the tab on the left for ethernet connection shows a green dot, says "self-assigned IP" and the status says "connected" PRIOR TO CONNECTING THE ETHERNET CABLE TO THE TIME CAPSULE. It shows a "self-assigned" IP (DHCP selected) of 169.254.69.249, even though I know my TC is 10.0.1.1. Turning the ethernet off then back on, renewing the DHCP lease, nothing seems to be able to make this 169 IP address go away. The wireless connection to the TC is just fine... everything does what it should, I just can't get the ethernet cable connection to work.
Out of curriosity, I went to the System Profiler, and on the network tab it shows ethernet IPv4 169.254.69.249 (name en0).
I know it's not the Time Capsule, as I connected my laptop to it just fine via ethernet. The TC was IP 10.0.1.1 and it assigned 10.0.1.5 to my laptop (I have a variety of devices on my network), and I was able to transfer data and access the internet with no issues whatsoever.
I live in an 32 story apartment with a built-in ethernet network and ISP included in my rent. It's pretty nice, high speed. I connect from the wall to the Time Capsule via ethernet (circle dot connection port, so I know I have the right port), and then wirelessly out to a couple of laptops, a couple of Airport Express, and of course my desktop.
Bottom line, I think the ethernet card on iMac G5 desktop has gone bad: A few questions:
(1) Any ideas what may be wrong? Has anyone seen this self-assigned IP thing that won't go away?
(2) Any ideas how to fix it?
(3) How much will it cost? It may be time to replace my 6-year old desk top computer.
Thanks, Andy

I've swapped out several cables still with no luck, and the current cable definitely has 8 pins and worked with my laptop, so I'm confident it's not the cable. Also, the Time Capsule seems to be OK, because it too worked with my laptop using the same port. The only variable that doesn't seem to be cooperating is my desktop computer.
Also, I have tried to manually assign an IP consistent with the network & appropriate subnet mask. It seems to take the IP address manually, but still I can't get internet access, and can't ping the Time Capsule in network utility either.
Finally, when I connect the desktop directly to my wall outlet, taking the router out of the equation entirely, network diagnostics shows ethernet failure...
Does that sound like a bad ethernet card?
What does it take to replace an ethernet card in an iMac G5?
Cheers, Thanks, Andy

Failure to mount

I back up 2 machines to my Time Capsule: one is hooked up by ethernet, the other by Airport (a PPC iMac). The Airport machine's back up failed with the error message:
'The backup disk could not be mounted.'
I can see and access the Time Capsule in the iMac's sidebar. However, I cannot get the iMac's 'sparsebundle' to mount. I get the error message:
'The following disk images failed to mount:
(Computer name) Reason: Resource temporarily unavailable.'
The other machine's sparsebundle mounts fine, even via Airport on the iMac.
Any ideas, short of deleting the iMac's back up image altogether and starting again?
I don't know if it's relevant, but I've just upgraded to 10.5.3 on the hardwired machine, but not on the iMac.

Had the same issue after updating to 10.5.3 but in reverse (My Macbook - wireless - no problems; Mini -ethernet - failure to mount.) The problem cleared up after rebooting the Mini. It stayed on "preparing to backup" for awhile but finally did its thing.

Cisco Aironet 1310 flash memory test

Dear Cisco Support Community
i have a problem on one of my 1310 wireless bridge it is stucked on flash memory test and after resetting the baudrate to 115200
all i see on the bridge is status and Ethernet Leds are blinking green.
Can you please help me?

LED Indications
During access point operation the LEDs provide status information as shown in Table 5-1.
Table 5-1 LED Signals
Message
type
Ethernet
LED
Status
LED
Radio
LED
Meaning
Boot loader status
Green
Green
DRAM memory test.
Amber
Red
Board initialization test
Blinking green
Blinking green
Flash memory test.
Amber
Green
Ethernet initialization test.
Green
Green
Green
Starting Cisco IOS.
Association status
Green
At least one wireless client device is associated with the unit.
Blinking green
No client devices are associated; check the unit's SSID and WEP settings.
Operating status
Green
Blinking green
Transmitting/receiving radio packets.
Green
Ethernet link is operational.
Blinking green
Transmitting/receiving Ethernet packets.
Boot loader errors
Red
Red
DRAM memory test failure.
Red
Red
File system failure.
Red
Red
Ethernet failure during image recovery.
Amber
Green
Amber
Boot environment error.
Red
Green
Red
No Cisco IOS image file.
Amber
Amber
Amber
Boot failure.
Operation errors
Green
Blinking amber
Maximum retries or buffer full occurred on the radio.
Blinking amber
Transmit/receive Ethernet errors.
Blinking amber
General warning.
Configuration reset
Amber
Resetting the configuration options to factory defaults.
Failure
Red
Red
Red
Firmware failure; try disconnecting and reconnecting unit power.
Firmware upgrade
Red
Loading new firmware image.
Controller status
Alternating green, red, and amber1
Connecting to the controller. Note If the access point remains in this mode for more than five minutes, the access point is unable to find the controller. Ensure a DHCP server is available or that controller information is configured on the access point.
Message
type
Ethernet
LED
Status
LED
Radio
LED
Meaning
1 This status indication has the highest priority and overrides other status indications.

Blue indicator light on 1131

The ringed indicator light on the 1131 normally glows green. What is indicated when it is glowing blue instead? Is this a power issue?

Hi,
Please take a look at the below table:
Table 3-1 LED Signals
Message type Cable Bay Area Top of Unit Meaning
Ethernet LED Radio LED Status LED
Operating status
Green
Ethernet link is operational.
Blinking green
Transmitting or receiving Ethernet packets.
Blinking green
Transmitting or receiving radio packets.
Blinking
dark blue
Software upgrade in progress
Association status
Light green
Normal operating condition, but no wireless client devices are associated with the unit.
Blue
Normal operating condition, at least one wireless client device is associated with the unit.
Cisco IOS errors
Blinking amber
Transmit or receive Ethernet errors.
Blinking amber
Maximum retries or buffer full occurred on the radio.
Red
Red
Amber
Software failure; try disconnecting and reconnecting unit power.
Amber
General warning, insufficient inline power (see the "Low Power Condition for Autonomous Access Points" section).
Boot loader status
Green
Green
Green
DRAM memory test ok.
Off
Blinking green
Blue-green
Initialize Flash file system.
Off
Green
Pink
Flash memory test ok.
Green
Off
Dark blue
Ethernet test ok.
Green
Green
Green
Starting Cisco IOS.
Boot loader warnings
Off
Off
Yellow
Ethernet link not operational.
Red
Off
Yellow
Ethernet failure.
Amber
Off
Yellow
Configuration recovery in progress
(Mode button pressed for 2 to 3 seconds).
Off
Red
Pink
Image recovery
(Mode button pressed for 20 to 30 seconds).
Blinking green
Blinking red
Blinking pink
Image recovery in progress and Mode button is released.
Boot loader errors
Red
Red
Red
DRAM memory test failure.
Off
Red
Blinking red and blue
Flash file system failure.
Off
Amber
Blinking red and blue-green
Environment variable (ENVAR) failure.
Amber
Off
Blinking red and yellow
Bad MAC address.
Red
Off
Blinking red and off
Ethernet failure during image recovery.
Amber
Amber
Blinking red and off
Boot environment error.
Red
Amber
Blinking red and off
No Cisco IOS image file.
Amber
Amber
Blinking red and off
Boot failure.
Link : http://www.cisco.com/en/US/docs/wireless/access_point/1130/installation/guide/113h_c3.html#wpxref37237
Regards,
Madhuri

I had a failure of a dsl modem which inturn destroyed my ethernet port of non isight imac G5. In attempt to solve the problem I did a clean install of leopard 10.5.4. I am unable to upate to 10.6,.7 or .8 without freezing system network preferences

Dsl modem failure caused malfunction of ethernet port. In attempt to solve problem I did a clean instillation of Leopard 10.5.4 and then update to 10.5.5 with access to internet through apple usb to ethernet adapter. If I attempt to update software to 10.5.6, .7 or .8 it freezes my network system preferences and computer will no longer shut down. The network connection assistant also no longer sees a connection to the internet throught the usb/ethernet adapter. I have checked they systerm Tech tool deluxe which shows no problems and also used hard drive utility on instillation disk which found no problems. Permissions were also checked as well and no problems noted. Any thoughts as I really like my imac G5.

Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If all the above fails, then it appears to be time for a relatively painless Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space and no Disk corruption, and is relatively quick & painless...
http://docs.info.apple.com/article.html?artnum=107120
Just be sure to select Preserve Users & Settings.

Ethernet connection and airport failure

I'm studying abroad in Madrid, Spain, and I'm having difficulty with my internet access. On campus, the IT director put in the airport location and password, and it won't log on. It says "failure to connect." Other Macs in the building are working fine, but mine. I noticed that when I open 'Internet Connect,' the status under Airport says "Computer to Computer." Also, at my residence, my ethernet connection is not working. I plugged in another Mac into my port, and it worked fine. I tried putting in the TCP/IP for Ethernet manually (IP Address, Subnet Mask, Router, and DNS servers), without success. I always get a message reading "unable to find host." Any help would be greatly appreciated!

Luz, talk to the IT staff, the base stations that you are using need to "know" your PB's card address, in the airport utility, how many base stations can you see? Also make sure that in the airport setting, you have removed the "allow this computer to create networks" tick, this can cause havoc in some networks and get your machine booted off.
best wishes
Andrew Platt

Best way to detect failure in Metro ethernet networks

Hello ,
I am working for a well known provider and I am currently migrating one of my client from Frame-relay to Metro-ethernet link .
I am actually looking for advices on what sort of mechanism to implement to detect a failure in the ME parth .
As you probably know , failure on one of the links might cause the CE-SWITCH-PE interfaces to stay up/up and the network will not neceseraliy start converging .
So far I have implemented BFD along with IP SLA route tracking , I am happy with BFD but the IP SLA is acting "weird" .
- IP SLA ICMP tracking rely on ICMP packets and was too sensitive to packets lost
- We switched to ip route sla tracking but I am still unsure about the best way to use or implement this .
Is there some sort of best practices available somewhere for this ?
thanks ¨
T

Hello Thomas,
From what i have seen BFD is best bet as it allows to relax the L3 protocols timers ( BGP / any other protocol used between CE- PE ). Another option is to have gre tunnel between the PE - CE link and track this tunnel interface.
Regards,
Shreeram

Can't call out on PSTN after ethernet adapter failure in J4W

Hi all
Okay here goes.
We are currently deploying new laptops in our business. It's the brand new Lenovo X1 Carbon 2nd G. together with a USB based docking station. Unfortunately there is a very annoying bug with the docking station. The problem is that the dock ethernet NIC, suddenly disappears from time to time in Windows. This means that Jabber for Windows is failing over to the Wi-Fi network. This should be okay, but we are seeing an issue with J4W, when the ethernet NIC disappear.
The problem is that J4W can't call out to external phone numbers/PSTN, but all internal calls are working fine. Also it's possible to call from an external number/PSTN to the J4W client. But still, the J4W client can't call an external no. You will only hear a busy tone when trying to make an external call.
It doesn't help restarting the J4W client, we have to reboot the entire computer to make the client be able to call external numbers over Wi-Fi. Meaning that the ethernet NIC on the docking station, isn't reappearing after a reboot of the laptop. To make it reappear, we have to disconnect and connect the docking station cable.
Atm. we are waiting for a fix from Lenovo, but in the meantime I can't understand why we can't call external no. when the ethernet NIC fails. I mean, we can call external numbers. over Wi-Fi, but not when the ethernet NIC are failing.
Can anyone point me into the correct direction here?
Specs:
CUCM: 8.6.2.22900-9
CUP: 8.6.4.13900-4
J4W: 9.7
Gateway: Cisco 2911
OS: Windows 7 32 bit.

Hello Taxi-Anne,
Welcome to the forums.
Try following the steps below to turn off the call forwarding:
1. Touch Phone.
2. Swipe down from the top of the screen.
3. Touch the Settings icon.
4. Touch Call Forwarding.
5. Touch the required option (e.g., Forward If Busy).
6. Touch Save.
Let us know if this helps. Have a good day.
-SR
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Be sure to click Kudos! for those who have helped you.Click Solution? for posts that have solved your issue(s)!

Airport Express Failure Caused by Ethernet Switch

I was baffled for a while with frequent dropouts of one of my Airport Express units. This one receives wireless from an Airport Extreme, then I connect its ethernet port to a gigabit switch which provides hardwire connections for my television, Blu-Ray, and Dish Network reciever. I also use its audio port for AirPlay music to my stereo.
This configuration worked flawlessly for a long time. Then it suddenly dropped out. Timing coincided with the release of 7.6 AirPort firmware, and iTunes 10.5.1 ... so naturally I blamed Apple, downgraded the software, and still had the problem.
The bigest clue came when I switched this Aiport Express with another one that had been working flawlessly in another room. It had te same symptoms. Conclusion: It wasn't the Apple hardware!
I unplugged the audio jack and ethernet cable. Suddenly the Airport Express was visible to my network. Next step change the CAT5/6 cable. That's when I discovered that my ethernet switch was blinking abnormally. So I removed its power. Upon restart/reset everything has been working normally for the last three days!
So the lesson learned is that the Airport Express is sensitive to the downstream devices connected to its ethernet port. I hope this can help someone with troubleshooting in the future. Dont panic! Check your cables and reset your devices.

I did initially leave it all to do its own thing and the new Airport Utility picture layout appeared to show it all connected up... but that would only last a minute or two before we noticed that the wifi was just gone (the pictures in Utility would change to yellow triangles and say the devices were no longer available.)
Sorry, but I cannot duplicate this error.
When you connect devices using Ethernet, AirPort Utility will display a solid line between the devices. A dotted line is displayed if the devices are connecting using wireless.

Ethernet failure

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