Subject: Re: gem (ERI/GEM/GMAC Ethernet device driver) has problems on macppc -current
To: Timo Schoeler <>
From: Steven M. Bellovin <>
List: current-users
Date: 10/20/2005 06:38:50
In message <>, Timo Schoeler writes:
>Steven M. Bellovin wrote:

>> That sure sounds like a collision problem.  It could be the switch or 
>> its configuration, it could be a full/half-duplex mismatch (try setting 
>> that explicitl), or it could be something about the NIC or driver.
>i tried this now on a manageable switch (Nortel 450):
>* running in full duplex mode not a single error occurs (i used a 4GByte 
>file and transferred it via ftp);
>* running in half duplex mode (set on the switch) shows the problem as 
>already written.

The next step is to try it on your original switch, but setting the 
interface mode explicitly to full- or half-duplex.  I suspect a 
negotiation problem, though I won't speculate if it's in the driver or 
your switch.

		--Steven M. Bellovin,