I will join this topic with a simular problem as slvfx. I have also lost my connection with internet, although I have just used a wired one (LAN) on my laptop ACER Aspire 5730Z. I was running it without a created connction in "Network Configuration" and there were no problems. Some days ago, may be, I made a mistake suring trying to connect to wireless internet. As slvfx, I have lost my connection with internet (using Ubuntu 8.10) and I tryed what Vanel and eager suggested here. A can ping myself and the gateway, but nothing more. And, suprising for me, I have working Skype. This is all. Here is what is responding to
"ifconfig"

eth0 Link encap:Ethernet HWaddr 00:1d:72:cb:d8:ac
inet addr:91.92.167.195 Bcast:91.92.167.255 Mask:255.255.255.0
inet6 addr: fe80::21d:72ff:fecb:d8ac/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8695 errors:0 dropped:0 overruns:0 frame:0
TX packets:2380 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:642354 (642.3 KB) TX bytes:337160 (337.1 KB)
Interrupt:16

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:2929 errors:0 dropped:0 overruns:0 frame:0
TX packets:2929 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:91971 (91.9 KB) TX bytes:91971 (91.9 KB)

and when I try to ping the gateway:
ping 91.92.167.1
PING 91.92.167.1 (91.92.167.1) 56(84) bytes of data.
64 bytes from 91.92.167.1: icmp_seq=1 ttl=64 time=6.14 ms
64 bytes from 91.92.167.1: icmp_seq=2 ttl=64 time=6.40 ms
64 bytes from 91.92.167.1: icmp_seq=3 ttl=64 time=6.40 ms
and it continues to endles...

Sleepy Wolf, I moved your post to it's own thread. It can become difficult trying to solve two persons problems in a single thread.

jschiwal, yes I see. I just didn't want to make new topics for simular problems, but it seems to be not so simular.

I can ping yahoo. This is what I have :
akula@akula-laptop:~$ ping 69.147.114.224
PING 69.147.114.224 (69.147.114.224) 56(84) bytes of data.
64 bytes from 69.147.114.224: icmp_seq=1 ttl=55 time=130 ms
64 bytes from 69.147.114.224: icmp_seq=2 ttl=55 time=130 ms
64 bytes from 69.147.114.224: icmp_seq=3 ttl=55 time=130 ms
64 bytes from 69.147.114.224: icmp_seq=4 ttl=55 time=130 ms
...
64 bytes from 69.147.114.224: icmp_seq=47 ttl=55 time=130 ms
^C
--- 69.147.114.224 ping statistics ---
47 packets transmitted, 47 received, 0% packet loss, time 46183ms
rtt min/avg/max/mdev = 130.146/132.049/141.675/3.265 ms


akula@akula-laptop:~$ ping 209.191.93.53
PING 209.191.93.53 (209.191.93.53) 56(84) bytes of data.
64 bytes from 209.191.93.53: icmp_seq=1 ttl=56 time=218 ms
64 bytes from 209.191.93.53: icmp_seq=2 ttl=56 time=218 ms
64 bytes from 209.191.93.53: icmp_seq=3 ttl=56 time=218 ms
64 bytes from 209.191.93.53: icmp_seq=4 ttl=56 time=211 ms
64 bytes from 209.191.93.53: icmp_seq=5 ttl=56 time=214 ms
64 bytes from 209.191.93.53: icmp_seq=6 ttl=56 time=211 ms
64 bytes from 209.191.93.53: icmp_seq=7 ttl=56 time=211 ms
64 bytes from 209.191.93.53: icmp_seq=8 ttl=56 time=211 ms
^C
--- 209.191.93.53 ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7056ms
rtt min/avg/max/mdev = 211.564/214.695/218.694/3.136 ms


But I still can not browse from internet, I have just skype.
Here is what I get with the commands "route" and "dig":
akula@akula-laptop:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
91.92.167.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 1000 0 0 eth0
didefault 91.92.167.1 0.0.0.0 UG 100 0 0 eth0
akula@akula-laptop:~$ dig

; <<>> DiG 9.5.0-P2 <<>>
;; global options: printcmd
;; connection timed out; no servers could be reached

Is name resolution working? Try ping-by-name and ping-by-address

catkin, name resoltion is not working. It gave to me "Unknown host linuxquestions.org". But with address 75.126.162.205
it is all right :"3 packets transmitted, 3 received, 0% packet loss, time 2006 ms" plus some other in the end.

OK. So the problem is name resolution, not gateway. What does you system use for name resolution? A good place to start would be

Here is what responded:
kula@akula-laptop:~$ cat /etc/host.conf
# The "order" line is only used by old versions of the C library.
order hosts,bind
multi on


akula@akula-laptop:~$ cat /etc/nsswitch.conf
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd: compat
group: compat
shadow: compat

hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
networks: files

protocols: db files
services: db files
ethers: db files
rpc: db files

netgroup: nis


akula@akula-laptop:~$ cat /etc/resolv.conf
# Generated by NetworkManager


Тhe first one # The "order" line is only used by old versions of the C library.
order hosts,bind
multi on I don't understand it...

You need your ISP's name servers listed in /etc/resolv.conf. If you use DHCP, check if they are set in your router which serves up these things. You might also consider entering a couple openDNS servers instead and using them whether you are connecting from home, or from a restaurant or coffee shop.

There is no names in /etc/resolv.conf All I have their is "#Generated by NetworkManager" May be this is the problem?
Beacause in the NetworkManager I have put the connection properties.

Did you get this resolved?

You might want to check your Network Manager profiles. You should delete any profile that tries to connect via wireless, reboot the computer, and see if the Network Manager reverts back to using your wired connection.

If the above does not work, you could manually added the DNS information to /etc/resolv.conf. The issue with this method is that you will have to do this every time you reboot your computer.
Use whatever text editor you know and add the following lines.
nameserver ipaddress.of.my.dnsserver -example nameserver 192.168.0.1

I would also keep an eye on slvfx's post.

Put in /etc/resolv.conf

These are from openDNS

If you want to force prevention of file overwriting, just set immutable bit:

btncix and xcristi - I thank you very, very much ! Your way to solve the problem is working ! With putting the dns server's name in the /etc/resolv.conf it's all right.

But this did not work. I could not find, but the Network Manager finds out always the wireless connections.

Thanks a lot ! :-)