December iMac vs. Netgear GS105 hub

[Shawn Erickson]

On Mar 4, 2007, at 2:05 AM, Gregor Alessi wrote:

>
> On 03.03.2007, at 21:19, Chad Leigh wrote:
>
>>
>> On Mar 3, 2007, at 12:18 PM, LuKreme wrote:
>>
>>> On 2-Mar-2007, at 17:45, Tom M.Blenko wrote:
>>>> AppleCare has been utterly unhelpful. They say that when iMac is  
>>>> plugged back to back with the dual G5 there's nothing wrong, so  
>>>> it's not a problem with the machine or its configuration. They  
>>>> want to blame the hub.
>>>
>>> And they are right.  If it works without the hub and it doesn't  
>>> work with the hub, then the hub is the issue.
>>
>> Well, it is not that simple.  In this case it probably is the hub.
>>
>> But directly hooking the two Macs together with a crossover  cable  
>> and it then working does not say that the Mac does not have an  
>> issue in meeting the ethernet spec that just doesn't happen to get  
>> tripped when hooking them together (maybe they both have the same  
>> issue so can talk together, both wrong)
>
> First thing I would try is a real router, and replace this fancy  
> Airport thing handing out IPs and somehow shoving packets around.
> Were having Netgears here (well, the 10/100 ones, FS series) but I  
> think we get more than 1-2 MB/s.
>
> AFAIK, Airport Extreme doesn't do Gigabit.
> http://gizmodo.com/gadgets/wireless/the-things-other-apple-airport- 
> extreme-reviews-dont-tell-you-237233.php
>
> I know the connection speed should be negotiated between the  
> involved hosts (in this case iMac-Switch-DPG5), so the router  
> should not be involved. Maybe some of the gurus could shed some  
> light on how those connections are invoked.

It sounds like a link negotiation issue with the hub and likely  
nothing to do with the Airport.

We have LinkSys hubs at work that sometimes get into a degraded state  
(one or more ports). The source of the issue is a logic flaw that can  
get triggered when a the IP based phones we have are connected to the  
hub with specific other devices (my MBP being one). Simply power  
cycling the hub restores normal connection speeds.

As an FYI I can max the 100baseT ports on my AE just fine.

-Shawn