Date: Wed, 12 Jan 2011 10:14:14 +0100 (CET) From: sthaug@nethelp.no To: lev@serebryakov.spb.ru Cc: freebsd-net@freebsd.org, ticso@cicely7.cicely.de, artem@aws-net.org.ua, ticso@cicely.de Subject: Re: Juniper e3k with ports limitied to 100Mbit and re NICs on MSI MoBo: problems with duplex negotiation (Hetzner host provider discard FreeBSD support due this bug) Message-ID: <20110112.101414.41710948.sthaug@nethelp.no> In-Reply-To: <165642603.20110112115208@serebryakov.spb.ru> References: <98602823.20110111225049@serebryakov.spb.ru> <20110111220314.GZ39356@cicely7.cicely.de> <165642603.20110112115208@serebryakov.spb.ru>
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> > I'm not surprised that it doesn't work with autonegotian if autonegotian > > is disabled. > > If Linux does full-duplex without autonegotiation then _they_ do it wrong > > and Hetzner shouldn't rely on wrong behavour. > As far as I understand, Linux does full-duplex without > autonegotiation because it is say to do full-duplex (like FreeBSD's > "ifconfig re0 media 100baseTX mediaopt full-duplex"). Is it violation > of standard too -- manual configuration of FD? Manual configuration of FD for 100 Mbps is not in violation of the standards. What the standards say (for 100 Mbps) is that *if* you have one end configured for autonegotiation *and* the other end is manually configured for full duplex, the autoneg end should end up as half duplex (with the inevitable errors as a result). This may be counterintuitive, but it's the way the standard is written. For Gigabit Ethernet autonegotiation is *required* by the standard, as other people already have pointed out. Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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