Bug 87859

Summary: (NET) ethtool does not detect link on connected ethernet device
Product: [Retired] Red Hat Linux Reporter: bastiaan
Component: kernelAssignee: Jeff Garzik <jgarzik>
Status: CLOSED WONTFIX QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 9CC: peterm
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2004-09-30 15:40:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description bastiaan 2003-04-03 09:04:21 UTC
From Bugzilla Helper:
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Description of problem:
ethtool incorrectly states 'link detected: no', even though the etherne t is
connected and up. 
As a consequence DHCP configuration fails, since
/etc/sysconfig/network-scripts/ifup queries ethtool via check_link_down. Static
configuration succeeds and as a workaround I can get DHCP working as well if I
comment out the check_link_down call.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. have an ethernet device installed (eth0)
2. ethtool eth0
3. ifconfig eth0
4. ping

Actual Results:  sh-2.05b# ethtool eth0
   Supported ports: [ TP MII ]
   Supported link modes:   10baseT/Half 10baseT/Full
                           100baseT/Half 100baseT/Full
   Supportes auto-negotiation: Yes
   Advertised link modes: Not reported
   Advertised auto-negotiation: No
   Speed: 10Mb/s
   Duplex: Half
   Port: MII
   PHYAD: 0
   Transceiver: internal
   Auto-negotiation: off
   Current message level: 0x00000001 (1)
   Link detected: no

sh-2.05# ifconfig eth0
eth0    Link encap:Ethernet  HWaddr 00:50:56:D4:22:68
        inet addr:  Bcast:  Mask:
        RX packets:10 errors:0 dropped:0 overruns:0 frame:0
        TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:100
        RX bytes:1524 (1.4 Kb)  TX bytes:1348 (1.3 Kb)
        Interrupt:10 Base address:0x10a0

sh-2.05# ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=64 time=1.28 ms

Expected Results:  Clearly the link is OK, so ethtool should detect it.

Additional info:

The tested configurations are VMware guest installs on VMware GSX 2.5 servers
(running on RH8.0 and RH7.3). eth0 is detected as PCnet/PCI II 79C970A and has
been configured for 'bridged networking' in VMware in one case and 'host only
networking' in the other.
The problem does not occur with RH8.0 running on the same VMware installations.

Comment 1 Dan Razzell 2003-05-13 06:28:40 UTC
Also reporting this behavior.

Comment 2 Need Real Name 2003-07-03 12:35:08 UTC
This same situation happens, if you try to run RedHat Linux 9 in VMware 4 as
GuestOS. Once you get rid of ethtool, things start working as they should be.

Comment 3 Jeff Garzik 2003-08-05 19:25:33 UTC
What ethernet driver(s) are being used?

ethtool requires link-detection support in the kernel driver.

Comment 4 Bugzilla owner 2004-09-30 15:40:44 UTC
Thanks for the bug report. However, Red Hat no longer maintains this version of
the product. Please upgrade to the latest version and open a new bug if the problem

The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, 
and if you believe this bug is interesting to them, please report the problem in
the bug tracker at: http://bugzilla.fedora.us/