Cannot ping outside university

David dpleydel at
Mon Sep 4 18:59:53 UTC 2006

Thanks for the many fast responses.

/etc/resolv.conf showed that the DNS servers on the PC were correct

But on the laptop despite trying many times with the networking GUI to set the
DNS servers to those values something kept automatically changing them to 


I have no idea why these automated edits were going on or how I might
stop them, but I edited /etc/resolv.conf manually to match that of the

Then there was a difference in the /etc/network/interf files. For the PC this file looked like 

dave at PC:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        # dns-* options are implemented by the resolvconf package, if installed

The "network" line was missing from the file for the laptop. So I added that line and what do you know

dave at Dell-Laptop:~$ ping -c 3
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=239 time=111 ms
64 bytes from icmp_seq=2 ttl=239 time=110 ms
64 bytes from icmp_seq=3 ttl=239 time=110 ms

--- ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 110.579/111.001/111.436/0.520 ms


Thanks for every one who has contributed to saving our skins! This is
my first posting to the Ubuntu forums and I gotta say...

... you guys rock!!!!

cheers and beers
Dave 87)

> You might want to look in to DNS as a culprit? What are the DNS servers
> used on the PC? What are they on your laptop? Usually
> under /etc/resolv.conf   and perhaps listed in /etc/network/interfaces
> Also universities may use some kind of proxy system, is yours setup OK
> to cope with it? Is it possible the university changed it's system in
> someway recently?

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