Re: 2.4.4 breaks dhcpcd with Realtek 8139

From: Ingo Oeser (
Date: Sun Apr 29 2001 - 06:04:32 EST

On Sat, Apr 28, 2001 at 11:11:51PM +0100, Michael F Gordon wrote:
> On Sat, Apr 28, 2001 at 11:29:15AM -0700, David Lang wrote:
> > what sort of switch are you plugged into? some Cisco switches have a
> > 'feature' that ignores all traffic from a port for X seconds after a
> > machine is plugged in / powered on on a port (they claim somehting about
> > preventing loops) it may be that the new kernel now boots up faster then
> > the old one so that the DHCP request is lost in the switch, a few seconds
> > later when you do it by hand the swich has enabled your port and
> > everything works.
> I'm plugged in to a cable modem, with the DHCP server at the ISP. The
> server requires the MAC address to be registered, so sending the DHCP
> request with a different MAC address could cause the symptoms. I doubt
> it's a timing problem - replacing the 8139 driver with the 2.4.3 version
> but otherwise using the distributed 2.4.4 makes DHCP work as expected.

The Windows drivers distributed along with that Realtek cards
have this problem[1] any many users of the CSN[2] run into the
"secure mode" on our hubs/switches, causing their port to be

So we have just ported a BUG from Windows to Linux, if you are
right ;-)

BTW: CC'ed the maintainer. He might be interested, as maintainers
   usally are on BUGs ;-)


Ingo Oeser

[1] Sometimes forgetting their MAC and sending either random or
   zero MAC out. This depends on whatever.

[2] Chemnitz Students Network - large LAN with >1000 computers

10.+11.03.2001 - 3. Chemnitzer LinuxTag <>
         <<<<<<<<<<<<     been there and had much fun   >>>>>>>>>>>>
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This archive was generated by hypermail 2b29 : Mon Apr 30 2001 - 21:00:22 EST