Subject: More info on Tulip confusion
To: None <firstname.lastname@example.org, email@example.com>
From: Hal Murray <firstname.lastname@example.org>
Date: 04/17/1999 04:09:15
I managed to get a pair of Tulips going between a NetBSD system and
a DUnix system. (Both Miatas.) The trick is/was to set the mode
manually at the console (>>> set ewa1_mode Fast). It works fine
in half-duplex. It hangs or crawls if you hit it hard in full duplex.
(FTPing a 100K byte file is enough to provoke the problem.)
At one point, I noticed the LEDs on the cards blinking. I assume
the autonegotation heuristics are incompatible and they were dancing
around in circles.
Intel 82588s seem to work OK between NetBSD and DUnix systems. They
agree on full-duplex and it works.
I learned some more about the printout from ifconfig. The "SIMPLEX"
on the first line doesn't mean half duplex. It means the hardware
won't hear any packets it sends.
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
media: Ethernet autoselect (100baseTX full-duplex)
inet 10.0.3.83 netmask 0xffffff00 broadcast 10.0.3.255
The full/half indication is on the media line. (But the "half" won't
#define IFF_SIMPLEX 0x800 /* can't hear own transmissions */