Comment 44 for bug 50099

I disagree with Saivann. It could be the same bug which is producing problems in both wireless and wired networks. I am sure that just one fix is needed for both.
By the way, the Tom M's tip worked for me. Even for static IP (see comment by FOX on 2007-10-10, bug #53387) it works fine (by commenting and uncommenting the needed lines):

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

#/sbin/ifconfig eth0 xxx.xxx.xxx.xx netmask xxx.xxx.xxx.xx up
#/sbin/route add -net default gw xxx.xx.xxx.xx

/sbin/idown eth0
/sbin/ifup eth0
exit 0