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Date: Fri, 2 Feb 2001 15:44:51 -0800 (PST)
From: klui@cup.hp.com
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/24811: Networking in FreeBSD 4.2-RELEASE doesn't allow full-duplex<->half-duplex communication
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>Number:         24811
>Category:       kern
>Synopsis:       Networking in FreeBSD 4.2-RELEASE doesn't allow full-duplex<->half-duplex communication
>Confidential:   no
>Severity:       critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Feb 02 15:50:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Ken Lui
>Release:        4.2 from the BSDi CD-ROMs
>Organization:
>Environment:
>Description:
I have a FreeBSD 4.2 installation at work over 10baseT at full duplex
communicating with a FreeBSD 4.2 installation at home over 10baseT at
half duplex. The office box is connected to a switch. The remote is
connected to a hub via SDSL. If I copy files from the 4.2 box at work
to the 4.2 box at home, I will inevitably get network stalls. Searching
dejanews reveals that this may be caused by the interaction between a
machine that is connected at full duplex versus one that is connected at
half duplex. The work machine has used the following ethernet cards with
the same results: PCNet-FAST/NCR 53c875 combination card (pcn driver)
and 3Com 3c905B XL (xl driver).

Netmask for the machine at work is 255.255.248.0, netmask for the box
at home is 255.255.252.0.

When the work box is running FreeBSD 3.2-RELEASE, using the lnc driver,
things work fine. If I use my HP 715 workstation running HPUX 10.20
within the same subnet as my work FreeBSD box, I can also transfer files
to my 4.2 box at home without any stalls. 

The box at home is using an Intel PRO/100B Management ethernet card via
the fxp driver.
>How-To-Repeat:
Use FreeBSD 4.2 and transfer a series of files (around 20, each over
200K in size) between two boxes where one box is connected to a switch
while the other is behind a hub. Refer to full description for more
information.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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