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

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please can somebody help?
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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,
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ap(config-if)#station-role root fallback shutdown
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ap#
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ap#
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*Mar 1 00:08:31.527: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, changed state to down
ap#
ap#sh ip inter brie
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*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
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Dot11Radio1 unassigned YES NVRAM administratively down down
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This Works....
Regards

Another update failure and restore

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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).
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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.
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★ Sorry, I don't answer questions via Private Messages. Posting in the appropriate forum is the best way to get assistance.

How to add another Ethernet support in WINCE 7??

Hello Friends,
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Hello Erwin,
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cpgmacMiniport.reg
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DHCP not issuing IP System Preferences/Ethernet failure

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Ethernet failure

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Need another ethernet port

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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...)
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Sat Aug 30 07:09:05 CEST 2008 MaxDB sdbinst:      *******************************
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Thanks
matt

Matthew,
have a look at this post:
MAXDB error during instal
I guess nearly the some problem, isn't it?
Klaus Kellers' replay:
You could try the following:
1) If exists, remove the folder <DRIVE>:Program FilesCommon FilesInstallShieldUniversalSAP and all sub-folders
2) Check your registry as described in How to delete Registry Key SAP_DBTech
Hope this helps,
Regards
K.Utech

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Another Ethernet failure?

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