Internet connection problem in Ubuntu 9.1

[mikeowin]

Some of my output from that machine (Ubuntu 9.10 up to date):

ifconfig

eth0 Link encap:Ethernet HWaddr 00:16:e6:64:e6:d1
inet addr:192.168.1.48 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::216:e6ff:fe64:e6d1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5603 errors:0 dropped:0 overruns:0 frame:0
TX packets:3446 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:663026 (663.0 KB) TX bytes:336602 (336.6 KB)

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:24 errors:0 dropped:0 overruns:0 frame:0
TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1192 (1.1 KB) TX bytes:1192 (1.1 KB)


route

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 1 0 0 eth0
169.254.0.0 * 255.255.0.0 U 1000 0 0 eth0
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0


sudo /etc/init.d/networking restart
* Reconfiguring network interfaces... Ignoring unknown interface eth0=eth0.

My machine run on LAN with default gateway to 192.168.1.1 (ADSL modem with DHCP enabled). DNS server also set to the address for my ISP use dynamic DNS system. Other machines (Windows XP, vista, windows server 2003) work fine. The problem i have only with this newly installed Ubuntu 9.10. I have to restart the PC few times or wait for about 1 hours then connection is ok. I dont know where is the problem.

[Pobednik]

Hello. I have no problem with it... Try to pull out the LAN 1 from your ADSL, then reboot the modem, and then take back the LAN 1 to your modem.

[mikeowin]

Hello. I have no problem with it... Try to pull out the LAN 1 from your ADSL, then reboot the modem, and then take back the LAN 1 to your modem.

I have small LAN with several machines, only this ubuntu PC has this problem. Physical connection is fine, for I still can access share in other machines. Only can not ping, open page in browser etc. In short no internet connection.