100TX Full Duplex not working forced to 100/half - fixed

I dont know if everybody figured this out. but I found this info on an old board and it worked for me on my qaud Intel running SL server.
First check your Network Utility to see which network interface is active but problamatic. (eg. en0, en1, en2).
Open terminal and enter command line:
sudo ifconfig en0 media 100baseTX mediaopt hw-loopback
Depending on your active network interface you may have to change the "en0" to "en1"......
My Mac immediately began communicating at 100/Full.
However, If you shut the machine down you will have to do this again after each reboot.

Yalp wrote:
The only possibility that I can see is that it is a software problem on these Macs.
There is always a certain level of slack engineering into all these devices. When you start updating one part of a network, you risk exceeding the slack. It is always possible that the problem is with the router hardware or cabling. Certainly, the problem would be with 10.6.5 too. But if you jump to one conclusion or the other without troubleshooting you risk waiting forever for a fix that will never come.
So, what you have to do is connect these Macs to some other router/hub running 100BT/Full (with settings as close to default as possible) with cables that you know are rated at that speed. If that fails, submit a bug report to Apple. If it works, take your router/hub and put it in the network cabinet and connect it to the Mac Pro with the existing cable. If that fails, sue whomever installed the cable and redo it (network people sometimes try to save money with cable). If that works, look at the existing router/hub and see if it has any bugs or firmware updates available. At this point, you could submit a bug to Apple with precise details about your router/hub and also submit one to the manufacturer of the router/hub. Apple will either fix the problem or contact the router/hub manufacturer and get a fix. Once you know precisely what connection is causing the problem, there may be other ways to address it either on the router/hub side or on the Mac side.

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Mac Pro 10.6.5 100baseTX Full Duplex Not Working

Hi Guys,
I am having some trouble with the Mac Pros that I support in my office (Early 2009 Model). Our network uses 100baseTX Full Duplex on all of our connections in a mixed PC/Mac environment. This was working perfectly fine until we updated our Mac Pros to 10.6.5 (Went straight from 10.5.6 to 10.6.5).
Every Mac Pro now has itself set to automatically detect the speed, and they keep setting themselves to 100/Half. If I go in and manually adjust it, setting it to 100/Full, I lose all connectivity to the ethernet (it doesn't even recognize that a cable is plugged in). This is causing a lot of troubles for our Mac users trying to access files on our shared drives. It is taking them about 5 minutes to download a 30MB file, rather than the 3 seconds it should.
I tried booting to our portable 10.5.6 drive and 100/Full works just fine. Our PowerMacs on 10.4.11 also work fine on 100/full. I tried using Cocktail and Sudo to force the change, but again the ethernet drops out. The problem persists through all user accounts on all the effected Macs. I have tried a fresh install of 10.6 and the problem persists. If I downgrade back to 10.5 the problem is gone. I know it is not an issue with the network because 2000 other machines are working just fine, and the affected ones work fine when downgraded.
I just spent a good hour on the phone with AppleCare, but after insisting it was a problem with our network for the first 45 minutes, they came to the conclusion that they simply could not help me. According to them, if I want networking help, I need to convince my company to spend $2,800 on their enterprise support, and even then they don't know if they will be able to help me. So, it looks like I am on my own here.
Anyone have any thoughts on what is going on or how to fix it?

Yalp wrote:
The only possibility that I can see is that it is a software problem on these Macs.
There is always a certain level of slack engineering into all these devices. When you start updating one part of a network, you risk exceeding the slack. It is always possible that the problem is with the router hardware or cabling. Certainly, the problem would be with 10.6.5 too. But if you jump to one conclusion or the other without troubleshooting you risk waiting forever for a fix that will never come.
So, what you have to do is connect these Macs to some other router/hub running 100BT/Full (with settings as close to default as possible) with cables that you know are rated at that speed. If that fails, submit a bug report to Apple. If it works, take your router/hub and put it in the network cabinet and connect it to the Mac Pro with the existing cable. If that fails, sue whomever installed the cable and redo it (network people sometimes try to save money with cable). If that works, look at the existing router/hub and see if it has any bugs or firmware updates available. At this point, you could submit a bug to Apple with precise details about your router/hub and also submit one to the manufacturer of the router/hub. Apple will either fix the problem or contact the router/hub manufacturer and get a fix. Once you know precisely what connection is causing the problem, there may be other ways to address it either on the router/hub side or on the Mac side.

Automatic full duplex not working on Inkjet 1200 with W7

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This question was solved.
View Solution.

Congratulations on your Post! As a Student you earned an A+
Some time ago I got auto duplex to work by deleting the 1200 in Devices and Printers, Restarting just to be safe, then letting Plug-N-Play install the driver by enabling install to search my computer and the web to find the latest driver. The new driver properties had the option to install 2 sided printing. I clicked on the option and tne printer worked (just as you said).
Then I failed to post my solution. My bad
Thanks for your post!

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100TX Full Duplex not working forced to 100/half - fixed

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