Bug 2896 - removing eth cable kills networking until cold boot
removing eth cable kills networking until cold boot
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: telnet (Show other bugs)
6.0
i386 Linux
medium Severity high
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Assigned To: Jay Turner
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Depends On:
Blocks:
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Reported: 1999-05-17 19:55 EDT by karrde
Modified: 2015-01-07 18:37 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 1999-05-18 10:34:47 EDT
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Description karrde 1999-05-17 19:55:41 EDT
I was changing out the ethernet cable on a running 6.0
machine (upgraded from 5.2) and when the new cable was in
(very fast switch), I had no traffic across eth0. ifconfig
looked fine and was up. Lights on the nic and the hub, no
traffic lights. ifconfiged eth0 down and up, no go. Did a
'reboot' and it still was not passing traffic across the
port. Did a 'shutdown -h now', then brought it up and was
fine and passing traffic again.
Comment 1 Jeff Johnson 1999-05-18 10:34:59 EDT
This sounds like a hardware problem.
Comment 2 Adam Thompson 1999-05-19 18:30:59 EDT
Some (poorly designed, IMHO) cards do this.  It is almost certainly a
hardware issue.  Possible workaround: rmmod followed by insmod.

Generally, forcing the driver to reinitialize the card will solve
this, but there are some *really* bad cards out there.

The chipset issue is usually something like:
- cable removed
- chipset detects no ethernet carrier; automatically tries to
renegotiate 10/100/HD/FD/whatever/TP/coax/ whatever it does;
- fails to find an ethernet connection; locks into some default mode
that may not be supported.  Default mode is often 10b2 or 10b5 (coax
and AUI, respectively) -- but most cards don't have these physical
ports.

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