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SubjectRe: Carrier detection for network interfaces
Jeff Garzik wrote:
> Martin Schlemmer wrote:
>> Is there any proper way to detect a carrier signal with network
>> interfaces ? I have recently come across a problem where we tried
>> to do with with checking for 'RUNNING', which do not work for all
>> drivers, as well as mii-tool that fails in some cases.
> What kernel version?
> In 2.6 you have linkwatch. In 2.4 and 2.6, you have ETHTOOL_GLINK, and
> mii-tool.

One thing to watch for, lots of drivers will not detect link
if the interface itself is not configured to be running (UP).
You can configure it up without an IP address of course...


Ben Greear <>
Candela Technologies Inc

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