Network configuration problem Mythbuntu 10.10

From	Richard Evans <rp.evans.nospam@tiscali.co.uk>
Newsgroups	comp.os.linux.hardware
Subject	Network configuration problem Mythbuntu 10.10
Date	2011-05-03 00:36 +0100
Organization	Aioe.org NNTP Server
Message-ID	<ipnf56$btc$1@speranza.aioe.org> (permalink)

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OK people this is just another of the problems I'm having with my MythTV 
front end, it's a problem I've had before. I previously tried other 
linux distributions, and kept running into the same problem, it just 
keeps coming back to haunt me. I can communicate locally but can not 
talk to the outside world.

Another thing that is strange is that have another machine running 
ubuntu that I use as my server, and have never had this problem on that 
machine. The only significant difference I can see is that my server has 
a 64bit processor, and is running a 64bit ubuntu, while the problematic 
machine has only a 32 bit processor, and so has to run the 32bit version 
of ubuntu. I don't know whether that would make any difference.

I can't see this being a problem with the network card or network 
drivers, because I have no problem communicating locally. Surely it must 
be a DNS or Gateway problem (or both), and I assume that that would make 
it an issue somewhere with the operating system. (Or am I missing 
something here).

I only discovered tonight that I still have this problem when I tried to 
use apt-get, and it wouldn't work. Doing a bit more experimenting I can 
ping any local address, and I can load web pages that are provided by my 
server. However I can't access any external web pages. I also tried 
experimenting with pinging the address pop3.tiscali.co.uk (my mail 
service). This works on my 64 bit system, but doesn't work on my 32 bit 
system. I tried copping the IP address of pop3.tiscali.co.uk and pinged 
that, again it works on my 64 bit system, but not on my 32 bit system.

Basically my 32 bit system can not communicate externally, which surely 
must be a gateway or DNS problem or both.

Up until tonight I hadn't touched the network settings. It was 
presumably set up to use DHCP by default. But when I discovered I had a 
problem I tried editing the network configuration files based upon the 
way my working 64 bit system is configured. I set a static address as 
that is the way I intend to eventually have it set up.


My /etc/network/interfaces was as follows:

auto lo
iface lo inet loopback

This is that way it was set before I made any changes, presumably set 
during the installation of the operating system. I added to it tonight 
and it is now as follows:

auto lo
iface lo inet loopback

# primary network interface
auto eth0
iface eth0 inet static
address 192.168.1.160
netmask 255.255.255.0
gateway 192.168.1.251


My /etc/resolv.conf was as follows:

# Generated by NetworkManager
nameserver 192.168.1.251

I've now added 2 lines, again based upon my working system, and it is 
now as follows:

# Generated by NetworkManager
nameserver 192.168.1.251
domain tiscali.co.uk
search tiscali.co.uk



As you have probably already worked out my router is at address 
192.168.1.251.

Amending these files has not solved the problem, I can still communicate 
perfectly with any local address, but can not communicate with the 
outside world.

I'm wondering if perhaps something in ubuntu or in the graphical desktop 
might be taking some network settings from somewhere else. I tried 
typing in ifconfig, and was a bit surprised to see am IP6 address was 
also listed, and I have no idea where that came from, as I don't even 
use IP6.

Any ideas as to how I can find out what is going on here and how to go 
about fixing it. If the system was using only the configuration files I 
have set, then it should just work, at the moment I'm just confused.

Thanks for any help.

Richard.

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Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-03 00:36 +0100
  Re: Network configuration problem Mythbuntu 10.10 Bit Twister <BitTwister@mouse-potato.com> - 2011-05-03 03:17 +0000
  Re: Network configuration problem Mythbuntu 10.10 Richard Kettlewell <rjk@greenend.org.uk> - 2011-05-03 14:57 +0100
  Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-03 15:25 +0000
    Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 15:13 +0100
      Re: Network configuration problem Mythbuntu 10.10 Michal Jaegermann <michal@gortel.phys.ualberta.ca> - 2011-05-06 09:26 +0000
        Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 15:12 +0100
    Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 15:21 +0100
      Re: Network configuration problem Mythbuntu 10.10 Richard Kettlewell <rjk@greenend.org.uk> - 2011-05-05 16:36 +0100
        Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 17:41 +0100
          Re: Network configuration problem Mythbuntu 10.10 Richard Kettlewell <rjk@greenend.org.uk> - 2011-05-05 17:50 +0100
            Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 18:04 +0100
            Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 18:17 +0100
          Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-05 21:37 +0000
            Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 00:53 +0100
              Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-06 00:19 +0000
                Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 02:59 +0100
                Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-06 16:22 +0000
                Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 18:38 +0100
                A couple of corections. Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 20:02 +0100
                Re: Network configuration problem Mythbuntu 10.10 Michal Jaegermann <michal@gortel.phys.ualberta.ca> - 2011-05-08 22:12 +0000
              Re: Network configuration problem Mythbuntu 10.10 "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2011-05-05 20:39 -0400
                Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 03:05 +0100
    Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 15:24 +0100
    Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 16:08 +0100
      Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 16:30 +0100
        Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 16:55 +0100
  Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 14:59 +0100
    Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-05 15:39 +0000
      Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-05 17:51 +0100
        Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-05 21:43 +0000
          Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 00:58 +0100
            Re: Network configuration problem Mythbuntu 10.10 J G Miller <miller@yoyo.ORG> - 2011-05-06 00:24 +0000
              Re: Network configuration problem Mythbuntu 10.10 Richard Evans <rp.evans.nospam@tiscali.co.uk> - 2011-05-06 01:51 +0100

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