Strange problem at my office - our systems apparently 'auto-negotiate' their network connections and sometimes leave them in half-duplex mode - which is a killer. I was running FC5 on my desktop machine and I added the following line to the /etc/rc.d/rc.local file:

ethtool -s eth0 speed 100 duplex full autoneg off

This worked fine. This morning, I installed Fedora 6 on the machine, and now I get this when this command runs:

ethtool -s eth0 speed 100 duplex full autoneg off
Cannot get current device settings: Operation not supported
not setting speed
not setting duplex
not setting autoneg

The command 'ethtool eth0' gives me this:

[root@nbc-penguin ~]# ethtool eth0
Settings for eth0:
Link detected: yes


I think I'm back in half-duplex mode. Can someone tell me what I need to do? My ifconfig looks like this - I guess the virtual devices (which weren't there in FC5) are due to the inclusion of the Xen module - I have not used any of the virtualization tools yet - does that affect it somehow??

thanks in advance,

nbc

==============
ifconfig -a

eth0 Link encap:Ethernet HWaddr 00:13:72:2D5:05
inet addr:10.131.86.8 Bcast:10.131.87.255 Mask:255.255.252.0
inet6 addr: fe80::213:72ff:fe2d:d505/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:23003 errors:0 dropped:0 overruns:0 frame:0
TX packets:22157 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:6174208 (5.8 MiB) TX bytes:19528670 (18.6 MiB)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2992 errors:0 dropped:0 overruns:0 frame:0
TX packets:2992 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2538992 (2.4 MiB) TX bytes:2538992 (2.4 MiB)

peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:23449 errors:0 dropped:0 overruns:0 frame:0
TX packets:25850 errors:1 dropped:0 overruns:0 carrier:0
collisions:1614 txqueuelen:1000
RX bytes:6295034 (6.0 MiB) TX bytes:18531913 (17.6 MiB)
Interrupt:17

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

veth1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

veth2 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

veth3 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:22157 errors:0 dropped:0 overruns:0 frame:0
TX packets:23003 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:19528670 (18.6 MiB) TX bytes:6174208 (5.8 MiB)

vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vif0.2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:972 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:66860 (65.2 KiB) TX bytes:0 (0.0 b)
======================

I turned off the Xen daemons and rebooted and the ethtool command seemed to work. Now it can see the device:

>> ethtool eth0

Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: off
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes

So at first glance, it appears to be related to Xen, which I have not used, and don't need at the moment. For now, I'll just leave those items disabled...

nbc

When you use Xen eth0 becomes peth0
so you should use
ethtool -s peth0 speed 100 duplex full autoneg off
Bogdan Timofte