Ethernet doesn't work (after using wifi adapter?)

[rPioneer]

I've used Ethernet before, (though quite a long time ago) to install packages and browse the internet etc, but after using a WiFi adapter for the first time Ethernet stopped working. I was using the adapter with a different router to the home router, somewhere else. When I plugged the Ethernet cable in after using the WiFi adapter, all three Ethernet lights came on (as normal, as far as I can remember) but when I tried to access the internet, Midori said

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Could not resolve hostname

I have fiddled with the /etc/network/interfaces file, with no luck. First I found that "lo" had been set to auto (I presume that is because I used a WiFi adapter) so following a thread on the E14 forum http://www.element14.com/community/thread/22838 I changed interfaces to

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auto eth0
iface eth0 inet dhcp

which didn't appear to do anything.

My interfaces file now reads (after more tinkering and web trawling)

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auto eth0
iface eth0 inet static
        address 192.168.1.34 //34 because i set it to that. No other reason. I tried 68 before, with no luck
        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255
        gateway 192.168.1.254

Now my Pi goes very slowly (but doesn't freeze) which I presume is due to the contents of interfaces (though I don't see why) during booting up at two different points:

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configuring network...

and

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starting enhanced syslog: rsyslog

and then also when I type startx, and at any point when a command includes sudo.

I've tried changing the Ethernet cable. No change at all.
Currently,

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ifconfig

gives

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eth0

Link encap:Ethernet   HWaddr b0:27:eb:ef:ao:99
inet addr:192.168.1.34 Bcast: 192.168.1.255 Mask: 255.255.255.0
UP BROADCAST RUNNING MULTICAST  MTU: 1500 Metric: 1
RX packets: 0 errors: 0 dropped: 0 overruns: 0 frame: 0
TX packets: 334 errors: 0 dropped: 0 overruns: 0 carrier: 0
collisions: 0 txqueuelen: 1000
RX bytes: 0 (0.0 B) TX bytes: 10745 (10.3 KiB)

and

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route -n

used to give no info (bare spaces where the IP addresses etc should be) when I had

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auto eth0
iface eth0 inet dhcp

but now gives the static configurations currently in interfaces (as interfaces is shown above)

Any idea what I need to do to stop the pauses and get Ethernet working again?

Cheers.

[morgad]

I had to resort to statis networking after an apt-get upgrade
(dhcp and startx currently broken on my machine)

try adding the following to the end of your /etc/interface interface file

dns-nameserver 8.8.8.8
dns-nameserver 8.8.4.4


if your /etc/resolv.conf has
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN


best regards
Dave

[rPioneer]

OK, thanks.

So what should my whole interfaces file look like? Do you mean add onto what is existing (all the static configuration)?

And what should your code do? What will it change?

[DougieLawson]

Delete the lines "network 192.168.1.0" and "broadcast 192.168.1.255" they aren't needed.

[rPioneer]

OK, I will try that. I think I already have though...

[morgad]

OK, thanks.

So what should my whole interfaces file look like? Do you mean add onto what is existing (all the static configuration)?

And what should your code do? What will it change?

here is my file -
$ cat /etc/network/interfaces

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auto lo
iface lo inet loopback

#auto eth0
#iface eth0 inet dhcp

auto eth0
iface eth0 inet static
address 192.168.1.27
gateway 192.168.1.1
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
dns-nameserver 8.8.8.8
dns-nameserver 8.8.4.4

Notice that I did not delete the existing (non-working) eth0 lines, I just commented them out.
If I ever get dhcp woriking again I can then switch back to the old lines

This should hopefully fix the "Could not resolve hostname" problem

There are various posts on the forum suggesting that you set dns nameservers in the /etc/resolv.conf file.
However this file gets overwritten occasionally, wheich is why there is a warning at the top of it to not hand-edit that file.

If you set them in /etc/network/interfaces they do not get overwritten

hope this helps

Dave

[DougieLawson]

Get rid of the

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network 192.168.1.0
broadcast 192.168.1.255

lines, they aren't needed.

[rPioneer]

By the way, the LINK led blinks occasionally.

I tried

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sudo apt-get update

with my /etc/network/interfaces file like

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auto eth0
iface eth0 inet dhcp

and it failed to load any links (like mirrordirector.raspbian.org etc) immediately.

But when interfaces looks like this (as it does currently, as you can see Dougie Lawson, I've removed the two lines)

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auto eth0

iface eth0 inet static
address 192.168.1.67
netmask 255.255.255.0
gateway 192.168.1.254

instead I get long pauses, and instead of failing at 0% loading, I believe one link loaded 7%.

It kept saying this:

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Err: <the link that failed, like mirrordirector.raspbian etc>
Something wicked happened resolving <the link that failed> (-5 No address associated with hostname)

Also, the cpu usage does not go up at all after typing 'sudo (command)' when the pi slows down loads. I don't know what it's doing, waiting for something?

Does that help?

Also do you know what has happened? It would help me if I knew what has gone wrong. (If you know )

[rPioneer]

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ping www.google.com

and

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ping -c3 www.google.com

both return

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ping: unknown host www.google.com

(and I don't know what the -c3 does, I'm just using stuff I'm finding online)

[DougieLawson]

Your interfaces file needs to have

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auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

without the loopback interface all sorts of strange things won't work.

[rPioneer]

oh really? great i'll put that in tomorrow. just packed up

[rPioneer]

is that as well as the eth0 static stuff, or should I change the dhcp bit of your code to the static stuff?

[DougieLawson]

For static you need

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auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.67
# either
netmask 255.255.255.0
# or using CIDR notation 
#netmask 24
gateway 192.168.1.254