Date: Fri, 2 Feb 2001 15:44:51 -0800 (PST) From: klui@cup.hp.com To: freebsd-gnats-submit@FreeBSD.org Subject: kern/24811: Networking in FreeBSD 4.2-RELEASE doesn't allow full-duplex<->half-duplex communication Message-ID: <200102022344.f12NipI50670@freefall.freebsd.org>
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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: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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