Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!tuvie!nestroy!mah
From: mah@nestroy.wu-wien.ac.at (Michael Haberler)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: NE1000 Clarkson PD strangeness
Message-ID: <1991Mar06.004805.5386@nestroy.wu-wien.ac.at>
Date: 6 Mar 91 00:48:05 GMT
Reply-To: mah@nestroy.wu-wien.ac.at (Michael Haberler)
Organization: Wirtschaftsuniversitaet Wien
Lines: 39

I ran into a strange problem today.

I bought a NE-1000 clone (I guess the manufacturer's name is 'GTC'). 

I use Rev.8 of the CU packet driver for the NE1000, on top of which
I run NOS KA9Q, version 910201.

Doing a ping, the IP adress is resolved properly with ARP intothe
destination ethernet adress. The Echo request message gets sent, but the 
Echo reply gets dropped, with a icmpInError in KA9Q. 

Now the ka9q source indicates this error counter is incremented with either
a ICMP message coming via a link-level broadcast, or a wrong header
checksum. 

The packet trace looks fine. However, it looks like the NE1000 packet driver
(or my card?) returns the wrong length on a packet receive (which would
explain the failed checksum test). 

At least a preliminary comparison of packet traces with a 3c501 pd lead 
me to believe that the NE1000 pd returns wrong length fields on receive 
(I *think* it's 2 bytes too long on the Echo reply receive, I'll have 
to check that again.)

The NS8390 is Rev. C. I also tried version 6 of the NE1000 driver - same
effect.

Any hints on what might be causing this?

- michael

ps.: I'm not sure on what to do with the DMA channel jumpers on the NE10000
board, but either way - no effect.

-- 
Michael Haberler	mah@nestroy.wu-wien.ac.at, mah@awiwuw11.bitnet
University of Economics and Business Administration 
Augasse 2-6,  A-1090 Vienna, Austria		
Tel: +43 (222) 313-36 x4796 (9-18 CET) 	Fax 347-555