Public bug reported:

Binary package hint: network-manager

Network manager drops wired connections repeatedly. It seems to be
correlated with accessing servers. Pages with lots of images (e.g.
www.dilbert.com) seem to trigger the bug more readily than simple text
only pages.

The connection is immediately picked up again using DHCP.

This is using Intrepid beta.

from lspci:
Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)

snippet from /var/log/daemon.log (private information has been replaced
with X or hostname or domainname):

Oct  6 15:25:01 whg21-laptop NetworkManager: <info>  (eth0): carrier now OFF 
(device state 8) 
Oct  6 15:25:01 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 8 -> 2 
Oct  6 15:25:01 whg21-laptop NetworkManager: <info>  (eth0): deactivating 
device. 
Oct  6 15:25:01 whg21-laptop NetworkManager: <info>  eth0: canceled DHCP 
transaction, dhcp client pid 6923 
Oct  6 15:25:01 whg21-laptop NetworkManager: <WARN>  check_one_route(): (eth0) 
error -34 returned from rtnl_route_del(): Sucess  
Oct  6 15:25:01 whg21-laptop avahi-daemon[5367]: Withdrawing address record for 
XXX.XXX.XXX.137 on eth0.
Oct  6 15:25:01 whg21-laptop avahi-daemon[5367]: Leaving mDNS multicast group 
on interface eth0.IPv4 with address XXX.XXX.XXX.137.
Oct  6 15:25:01 whg21-laptop avahi-daemon[5367]: Interface eth0.IPv4 no longer 
relevant for mDNS.
Oct  6 15:25:01 whg21-laptop NetworkManager: <info>  Setting system hostname to 
'whg21-laptop' (no default device) 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  (eth0): carrier now ON 
(device state 2) 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 2 -> 3 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Setting system hostname to 
'whg21-laptop' (no default device) 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) starting 
connection 'Auto eth0' 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 3 -> 4 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 1 
of 5 (Device Prepare) scheduled... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 1 
of 5 (Device Prepare) started... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 2 
of 5 (Device Configure) scheduled... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 1 
of 5 (Device Prepare) complete. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 2 
of 5 (Device Configure) starting... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 4 -> 5 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 2 
of 5 (Device Configure) successful. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 3 
of 5 (IP Configure Start) scheduled. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 2 
of 5 (Device Configure) complete. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 3 
of 5 (IP Configure Start) started... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 5 -> 7 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) 
Beginning DHCP transaction. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  dhclient started with pid 
8164 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 3 
of 5 (IP Configure Start) complete. 
Oct  6 15:25:04 whg21-laptop dhclient: Internet Systems Consortium DHCP Client 
V3.1.1
Oct  6 15:25:04 whg21-laptop dhclient: Copyright 2004-2008 Internet Systems 
Consortium.
Oct  6 15:25:04 whg21-laptop dhclient: All rights reserved.
Oct  6 15:25:04 whg21-laptop dhclient: For info, please visit 
http://www.isc.org/sw/dhcp/
Oct  6 15:25:04 whg21-laptop dhclient: 
Oct  6 15:25:04 whg21-laptop dhclient: wmaster0: unknown hardware address type 
801
Oct  6 15:25:04 whg21-laptop dhclient: wmaster0: unknown hardware address type 
801
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  DHCP: device eth0 state 
changed normal exit -> preinit 
Oct  6 15:25:04 whg21-laptop dhclient: Listening on LPF/eth0/xx:xx:xx:xx:xx:xx
Oct  6 15:25:04 whg21-laptop dhclient: Sending on   LPF/eth0/xx:xx:xx:xx:xx:xx
Oct  6 15:25:04 whg21-laptop dhclient: Sending on   Socket/fallback
Oct  6 15:25:04 whg21-laptop dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 
port 67 interval 7
Oct  6 15:25:04 whg21-laptop dhclient: DHCPOFFER of XXX.XXX.XXX.137 from 
XXX.XXX.XXX.251
Oct  6 15:25:04 whg21-laptop dhclient: DHCPREQUEST of XXX.XXX.XXX.137 on eth0 
to 255.255.255.255 port 67
Oct  6 15:25:04 whg21-laptop dhclient: DHCPACK of XXX.XXX.XXX.137 from 
XXX.XXX.XXX.251
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  DHCP: device eth0 state 
changed preinit -> bound 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 4 
of 5 (IP Configure Get) scheduled... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 4 
of 5 (IP Configure Get) started... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    address XXX.XXX.XXX.137 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    prefix 22 
(255.255.252.0) 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    gateway XXX.XXX.XXX.250 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    hostname 'hostname' 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    nameserver 
'XXX.XXX.XXX.10' 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    nameserver 
'XXX.XXX.XXX.11' 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>    domain name 'domainname' 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 5 
of 5 (IP Configure Commit) scheduled... 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 4 
of 5 (IP Configure Get) complete. 
Oct  6 15:25:04 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 5 
of 5 (IP Configure Commit) started... 
Oct  6 15:25:04 whg21-laptop avahi-daemon[5367]: Joining mDNS multicast group 
on interface eth0.IPv4 with address XXX.XXX.XXX.137.
Oct  6 15:25:04 whg21-laptop dhclient: bound to XXX.XXX.XXX.137 -- renewal in 
21028 seconds.
Oct  6 15:25:04 whg21-laptop avahi-daemon[5367]: New relevant interface 
eth0.IPv4 for mDNS.
Oct  6 15:25:04 whg21-laptop avahi-daemon[5367]: Registering new address record 
for XXX.XXX.XXX.137 on eth0.IPv4.
Oct  6 15:25:05 whg21-laptop NetworkManager: <info>  Setting system hostname to 
'hostname' (no default device) 
Oct  6 15:25:05 whg21-laptop NetworkManager: <info>  (eth0): device state 
change: 7 -> 8 
Oct  6 15:25:05 whg21-laptop NetworkManager: <info>  Policy set (eth0) as 
default device for routing and DNS. 
Oct  6 15:25:05 whg21-laptop NetworkManager: <info>  Activation (eth0) 
successful, device activated. 
Oct  6 15:25:05 whg21-laptop NetworkManager: <info>  Activation (eth0) Stage 5 
of 5 (IP Configure Commit) complete.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Network manager repeatedly drops connections
https://bugs.launchpad.net/bugs/279102
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