Network connection 'oddity'

[Snowhog]

I'm on vacation - have my laptop with me. I use Wicd, and it works at home on my wired and wireless connections to my router.

Here, at my Dad's place, Wicd sees his Wireless Access Point, and I'm given an IP address by the router, but thats it. I can not connect to the Internet - when booted into 10.04. Booting into 9.10 or 9.04 I am able to connect to the Internet. My /etc/network/interfaces files for all three OS's is the same:

auto lo
iface lo inet loopback

Why am I not able to connect to the Internet on 10.04 here at my Dads, but I can with 9.10 and 9.04?

[Detonate]

Re: Network connection 'oddity'

If you can connect to the router, but not to the internet, it is probably a DNS issue. Check the /etc/resolv.conf files and see if they match. If you are using DHCP this file is automatically rewritten every time you connect. You might try connecting with a static IP and provide the DNS servers manually by editing this file.

[oshunluvr]

Re: Network connection 'oddity'

Also check with the route command to see if you're getting a route to the router.

[Snowhog]

Re: Network connection 'oddity'

Thank you both.

Okay, I think the problem is that a default gateway isn't being generated, but I don't know why.

From Kubuntu 9.10 (which I'm in now) and from which Internet connectivity does work:
resolv.config

nameserver 207.69.188.187
nameserver 207.69.188.186

route

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

From Kubuntu 10.04 and from which Internet connectivity does not work:
resolv.config

nameserver 207.69.188.187
nameserver 207.69.188.186

route

Kernel IP routing table
Destination   Gateway     Genmask     Flags Metric Ref  Use Iface
192.168.118.0  *        255.255.255.0  U   0   0    0 vmnet8
192.168.1.0   *        255.255.255.0  U   0   0    0 vmnet1
192.168.1.0   *        255.255.255.0  U   0   0    0 eth0

If the problem is that a default gateway isn't being created, then first, why isn't it, and second, how do I remedy it?

[Detonate]

Re: Network connection 'oddity'

I don't have wicd installed on this computer, so I am not sure whre you do this, but there must be a place in wicd to enter the gateway.

[oshunluvr]

Re: Network connection 'oddity'

I'm not a wicd guru and I use static ip's with the gateway defined in interfaces.

The command to add the default gateway is:

sudo route add default gw 192.168.1.1 eth0

work around would be add this to rc.local

[Snowhog]

Re: Network connection 'oddity'

That doesn't work - tired already.

I have however, 'narrowed' down the cause. When I boot into 10.04, I normally run the 2.6.32-22-generic-pae kernel. With this kernel, I'm having the problem. However, if I boot using the 2.6.32-22-generic kernel, which I'm in now, then I don't have the problem.
resolv.config

nameserver 207.69.188.187
nameserver 207.69.188.186

route

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

When booting the 2.6.32-22-generic-pae kernel, I noticed that the virtual machine entries in route are created, even though I'm not running the VM. These entries are not listed when route is run in the non-pae kernel.

[Snowhog]

Re: Network connection 'oddity'

Any other thoughts?

[dibl]

Re: Network connection 'oddity'

Did you get a new kernel in yesterday's updates? I got a -23 generic (64-bit).

[Snowhog]

Re: Network connection 'oddity'

No. The -pae kernel appears to be the problem. Running the -generic kernel, all is well. It isn't a big deal actually. As I only have 1-Gig of RAM, I don't really gain much of an advantage using the -pae kernel. But it is odd that I can't connect to the Internet running the -pae kernel. I'm sure someone has experience on this, and would like to here what they have to say on the matter.

[Detonate]

Re: Network connection 'oddity'

Did you get a new kernel in yesterday's updates? I got a -23 generic (64-bit).

Dible, what repository do you have enabled to get this upgrade? I have all the repositories enabled, including backports, and I did not get a kernel upgrade. A ppa perhaps?