Restart required to connect to the internet

[EcoNico]

Dear all,

For some reasons, ubuntu 8.04 2.6.24-23-generic does not allow me to directly connect to the internet after I start my computer.
I am always obliged to restart my PC to obtain the connection.

Here is what ifconfig returns when the connection is unavailable:

--------------------------------

eth0 Link encap:Ethernet HWaddr 00:00:6c:ad:b4:f1
adr inet6: fe80::200:6cff:fead:b4f1/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
TX packets:134 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:0 (0.0 B) Octets transmis:23195 (22.6 KB)
Interruption:220 Adresse de base:0x8000

eth0:avahi Link encap:Ethernet HWaddr 00:00:6c:ad:b4:f1
inet adr:169.254.10.101 Bcast:169.254.255.255 Masque:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interruption:220 Adresse de base:0x8000

lo Link encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:Hôte
UP LOOPBACK RUNNING MTU:16436 Metric:1
Packets reçus:1774 erreurs:0 :0 overruns:0 frame:0
TX packets:1774 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:88976 (86.8 KB) Octets transmis:88976 (86.8 KB)


--------------------------------




And here is what I get when the connection is back on, after a restart:


--------------------------------

eth0 Link encap:Ethernet HWaddr 00:00:6c:c6:f7:e5
inet adr:192.168.1.24 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6: fe80::200:6cff:fec6:f7e5/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:7918 erreurs:0 :0 overruns:0 frame:0
TX packets:6594 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:9388092 (8.9 MB) Octets transmis:958609 (936.1 KB)
Interruption:220 Adresse de base:0x8000

lo Link encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:Hôte
UP LOOPBACK RUNNING MTU:16436 Metric:1
Packets reçus:1624 erreurs:0 :0 overruns:0 frame:0
TX packets:1624 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:81200 (79.2 KB) Octets transmis:81200 (79.2 KB)

--------------------------------



I verified the "interfaces" file as well as the "70-persistent-net.rules" Everything looks normal to me.

Could someone give me a hint?
I would greatly appreciate it.
thanks

[FishRCynic]

network manager running?
if so
before rebooting does disabling and re-enabling the
wired network get you linked to the network.
(dhcp does not seem to be activated 1st time round)

[EcoNico]

yes, Network manager was running. Disabling and re-enabling it does not work.

One thing I had not mentioned: this only happens when I unplugged the PC power cord from the power outlet, and therefore cut some kind of stanby link between the PC Ethernet port and the Modem/router..

[FishRCynic]

what happens when you unplug the ethernet cable (before rebooting) from the pc and then plug it back in?

[EcoNico]

Steps detailed:

1) with the internet working, I unplugged the Ethernet cable from the Modem/Router

2) I rebooted

3) After logging in, I plugged the Ethernet cable back to the Modem/Router

4) I checked --> NO internet connection ; ifconfig does not display any inet address looking like 192.168....

[superprash2003]

how about typing sudo dhclient eth0 in the terminal

[EcoNico]

sudo dhclient eth0 does work when only the Ethernet cable is unplugged and plugged back after reboot as describd in post #5, HOWEVERit does NOTwork when I switch the computer OFF, unplugged the power cord from the power outlet, wait a bit and eventually re-plugg and re-start everything.

[FishRCynic]

ok try

sudo /etc/init.d/networking stop
sudo /etc/init.d/networking start

after startup

[EcoNico]

Here is what I got:


1) NETWORKING STOP

nicole@nicole-desktop:~$ sudo /etc/init.d/networking stop

* Deconfiguring network interfaces... * Stopping the Firestarter firewall...
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
...done.
* Starting the Firestarter firewall...
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
...fail!
run-parts: /etc/network/if-down.d/50firestarter exited with return code 2
There is already a pid file /var/run/dhclient.eth0.pid with pid 5959
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:00:6c:6f:51:df
Sending on LPF/eth0/00:00:6c:6f:51:df
Sending on Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.1 port 67
[ OK ]


2) NETWORKING START

nicole@nicole-desktop:~$ sudo /etc/init.d/networking start
* Configuring network interfaces... There is already a pid file /var/run/dhclient.eth0.pid with pid 134519072
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:00:6c:6f:51:df
Sending on LPF/eth0/00:00:6c:6f:51:df
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
* Stopping the Firestarter firewall...
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
...done.
* Starting the Firestarter firewall...
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
eth15: error fetching interface information: Device not found
...fail!
run-parts: /etc/network/if-up.d/50firestarter exited with return code 2

[FishRCynic]

open port 67 on your firewall and see what happens

allow dhcp service in firewall should work too