Internet connection problem in Ubuntu 9.1

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http://www.linuxforums.org – 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: Bcast: Mask: 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: Mask: 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 * U 1 0 0 eth0 * U 1000 0 0 eth0 default 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 (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. (HowTos)