[Soekris] net5501 vr(4) repeated unplug/replug -> port stops working

[Mike Tancsa]

At 04:45 PM 2/27/2008, Stuart Henderson wrote:
>On 2008-02-27, Andreas Wrede <aew.soekris at planix.com> wrote:
> >
> > On Feb 26, 2008, at 18:05 , Jared D. McNeill wrote:
> >
> >> Stuart Henderson wrote:
> >>> I've seen some problems with the onboard NICs on net5501, where
> >>> if the device connected is unplugged and replugged, the interface
> >>> has link, is able to transmit packets, but is unable to receive
> >>> packets (nothing shown in tcpdump on the interface). Bringing
> >>> the interface down and back up fixes it.
> >>>
> >>> Has anyone noticed this on OS other than OpenBSD?
> >>
> >> I see it on NetBSD also. Glad I'm not the only one :-)
> >
> > For me, it does not happen as long as the interface is in promiscuous
> > mode (ie. while watching to see if I can reproduce the problem).
>
>I first noticed this on NICs configured as a bridge.

On FreeBSD, I created this simple userland script that resets the nic 
by watching for its up/down events in syslog's kern.* facility. The 
proper fix on FreeBSD is at

http://people.freebsd.org/~yongari/vr/



#!/bin/sh

#look for the following in kern.* on FreeBSD     vr1: link state changed to UP
#this means the interface state might have bounced, or just come 
up.  On FreeBSD 6.x
#this often results in a wedged NIC, so do an extra down/up and 
generate some traffic


while read LINE
do
TRIG=`echo "$LINE"|awk '/vr.: link state changed to UP/ {where = 
match($0, /vr.:/);if (where) {print substr($0, where, 3)}}'`

if [ -n "$TRIG" ]
then
         echo $TRIG

                 /usr/bin/logger "Resetting due to up/down event $TRIG"
                 sleep 5
                 /sbin/ifconfig $TRIG down
                 /sbin/ifconfig $TRIG up
                  # ping the broadcast address just to generate some 
traffic. This helps as well
                 /sbin/ping -c 1 -t1 -q `/sbin/ifconfig $TRIG |awk 
'/broadcast/ {print $6}'`
                 /usr/bin/logger "$TRIG restart done"
                 TRIG=""
fi
done



In syslog, I have

kern.*                                         | exec 
/usr/local/sbin/interface-check.sh


         ---Mike