Re: ethernet card question
On 21/03/2005 at 13:34 -0400, Rolando Abarca wrote:
> is there a way to know if there's a cable connected to the ethernet
> card?... I ask this because I have a lombard powerbook, with a dhcp
> configured eth0, but if I boot GNU/Linux (ubuntu hoary) it stops waiting
> for a dhcp server, I would like to modify the networking script, so if
> there's no cable present on the card, don't configure the eth0 device,
> only the loopback. Is it possible?
If the driver supports something as ethtool, yes.
I've removed the auto stanza of eth0 in /etc/network/interfaces, and put
this little script in /etc/rc.boot/check-eth :
---8<---
#! /bin/sh
echo2 () {
echo "$*" >&2
}
die () {
echo2 "$*"
exit 2
}
IFACE=eth0
LINKSTATE=`/usr/sbin/ethtool $IFACE | grep -i link\ detected`
LINKDETECTED=`echo $LINKSTATE | awk '{ print $3 }'`
case "$LINKDETECTED" in
"no") echo2 "$IFACE: cable disconnected"
/sbin/ifdown $IFACE 2>/dev/null
/sbin/ifconfig $IFACE down
;;
"yes") echo2 "$IFACE: cable connected"
/sbin/ifdown $IFACE 2>/dev/null
/sbin/ifconfig $IFACE down
/sbin/ifup $IFACE
;;
*) die "ERROR: LINKSTATE not handled: .$LINKSTATE."
;;
esac
--->8---
I have an iBook G3; it's ethernet interface works with both gmac and
sungem drivers. This only works with the sungem one (because gmac does
not support ethtool).
--
Kiko
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