my IP adress is changed automaticly

[jackm]

Hi all,
I excute the following command to activate my eth0 :

sudo ifup eth0

when I execute ifconfig I get the following result:

eth0      Link encap:Ethernet  HWaddr 00:15:C5:17:2B:D8  
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::215:c5ff:fe17:2bd8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22811 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22754 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:17157553 (16.3 MB)  TX bytes:2852364 (2.7 MB)
          Interrupt:22 
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:976 errors:0 dropped:0 overruns:0 frame:0
          TX packets:976 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:90482 (88.3 KB)  TX bytes:90482 (88.3 KB)

after few minutes I couldn't connect to internet and when I execute ifconfig I get :

eth0      Link encap:Ethernet  HWaddr 00:15:C5:17:2B:D8  
          inet6 addr: fe80::215:c5ff:fe17:2bd8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22582 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22504 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:17027033 (16.2 MB)  TX bytes:2822194 (2.6 MB)
          Interrupt:22 

eth0:avah Link encap:Ethernet  HWaddr 00:15:C5:17:2B:D8  
          inet addr:169.254.145.140  Bcast:169.254.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:22 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:965 errors:0 dropped:0 overruns:0 frame:0
          TX packets:965 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:89507 (87.4 KB)  TX bytes:89507 (87.4 KB)

who to resolve this problem

[superprash2003]

do an ifdown and ifup again..

[lemming465]

New to me; none of my ubuntu systems have ever done this to me. The eth0:avah makes me think that something weird is going on with avahi-daemon. What other kinds of systems are running off your router?
The 169.254.145.140 IP address is from the "zeroconf" automatic address range, and doesn't match your router, which is the direct cause of the problem. The advice fom superprash2003 is good, except I have a nagging feeling you will just get the problem back a few minutes later.

If you don't actually need Bonjour-style apple multicast DNS support, you could perhaps improve the situation with sudo apt-get remove avahi-daemon

[jackm]

do an ifdown and ifup again..

I tried this, the problem is resloved but after few minutes later the problem is back

, except I have a nagging feeling you will just get the problem back a few minutes later.

it is true

If you don't actually need Bonjour-style apple multicast DNS support, you could perhaps improve the situation with sudo apt-get remove avahi-daemon

is it possible to stop disbale avahi-daomon with out remove it ?
I tried the following command , but the problem isn't resolved

sudo /etc/init.d/avahi-daemon stop

[stream303]

Could it be that your ethernet controller is entering a power-save mode as directed by the bios?

I've heard of this happening before and disabling power-management for the ethernet card in bios can cure it sometimes.

[lemming465]

ss it possible to stop disbale avahi-daomon with out remove it ?

Of course. The likely thing to try would be stop avahi-daemon and then bounce the networks, e.g.

sudo rm /etc/rc2.d/S18avahi-daemon
sudo /etc/init.d/networking restart

[jackm]

thanx lemming465