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Old 05-11-2010, 11:01 PM
Default Network Connection problems after Upgrade to 10.04 LTS, from 08.04 LTS

On 05/11/2010 03:09 PM, Jay Ridgley wrote:
> Folks,
> cc:NoOp
> The laptop I am using is a Dell Latitude C610. I have a Linksys Wireless-G card
> WPC54GS ver.2 as well, however the connection I am trying to make right now is a
> plain vanilla eth0.
> I have no other OS available on the system. I do not have a liveCD available.
> I double checked /etc/hosts, /etc/network/interfaces and /etc/resolv.conf agree
> with the other systems in my network.
> ifconfig shows: (as desired)
> Inet addr: Bcast: Mask:
> it is up and running I can ping my nameserver/gateway, however, none of the
> other systems or the outside world is reachable. Nor can I ping the laptop from
> one of them, other that the nameserver/gateway
> There is some external traffic since the Invest applet is being updated.
> I have noted a route that should not be present, at least it is not on my other
> systems. How can that route be removed? I have tried to issue a route del
> command but evidently I do not have a proper request created because the command
> returns an error SIOCDELRT: No such device and nothing is changed. The command I
> am using is:
> sudo route del mateo
> mateo is not a route present on my other systems.

Do you still have your emails from Feb/March: "Help with content of
/etc/network/interfaces file"?

Unfortunately, because those were not in a single thread it would take
too much work to cobble all of them together for a response. However, at
the time I recall that you were messing about with Firestarter etc., and
finally managed to get things working:

A couple of things were giving me fits...

1. NO DHCPOFFERS - I discovered a how on www.ubuntugeek.com that
contained information on trouble shooting network connections and used
several pointers I found there to resolve that issue.

2. Firewall problems - I was using Firestarter and was having problems
with getting out side my local network. I solved that problem by
bringing up Shorewall.

I am able to use my laptop on my wireless sub net now.

Note that your mask is still
That in itself is OK if you are only expecting 16 IP's on that subnet & certainly falls within that range ( - so that's not likely the problem - as long as the
gateway is as well, but worth keeping in mind.

I suspect the same issue may have raised it's head again. You might want
to flush the IP tables & see if that cleans things up:

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