[ltp] Re: Question on ifplugd and ACPI suspend

[km]

On 28/09, Bob Alexander wrote:
> I like ifplugd which monitors my eth0 and brings up/down the interface 
> if its plugged/unplugged.
> 
> There is one case which is not working though.
> 
> 1) Interface is up and running at home with address A
> 2) I suspend
> 3) Plug into my office LAN
> 4) Address remains A
> 
> At this point if I manually unplug the cable and then plug back in 
> ifplugd correctly intervenes and assigns address B to eth0.
> 
> Can I force ifplugd to check things after a suspend (using swsusp2).
> 
> Thank you,
> Bob
> -- 
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad

I have the included (below) preup() in my /etc/conf.d/net script which checks
for a link on the interface before bringing it up. I've also got DHCP timeout
set to 5 seconds. I dont like waiting. :)

In detail, I lock at 100base-TX, then check, then sets the interface to autoneg
and check again.
And in my suspend script I just cycle the interface with /etc/init.d/net.eth0
restart. I guess You could also go for the solution to just check for a link
in Your suspend script (when waking up) and restart eth0 if needed.

-------------------------------------------------------------------------------
preup()
{
  # Start with 100 full
#  mii-tool ${IFACE} -r -R
  mii-tool ${IFACE} -F 100baseTX-FD

  # Test for link on the interface prior to bringing it up.
  if mii-tool ${IFACE} 2> /dev/null | grep -q 'no link'; then
    mii-tool ${IFACE} -r -R
    sleep 1
    # Recheck with autoneg if network is from previous millenium
    if mii-tool ${IFACE} 2> /dev/null | grep -q 'no link'; then
      ewarn "No link on ${IFACE}, aborting configuration"
      return 1
    fi 
  fi 
  return 0
}
-------------------------------------------------------------------------------

-km