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  #1 (permalink)  
Old 02-21-2008, 12:20 PM
Mark Hobley
 
Posts: n/a
Default Domain name resolver is not working

I am trying to configure the network on my Gentoo machine. The
/etc/conf.d/net file contains the following entries:

config_eth0=( "10.0.0.13 netmask 255.255.255.0 brd 10.255.255.255" )
routes_eth0=( "default via 10.0.0.1" )
dns_servers_eth0="62.31.144.39 195.188.53.175 62.31.112.39"

I now try to test the networking:

ping 10.0.0.1
64 bytes from 10.0.0.1: icmp_seq=1 ttl=250 time=0.567 ms

cat /etc/resolv.conf
nameserver 62.31.144.39
nameserver 195.188.53.175
nameserver 62.31.112.39

Ok, the scripts must have created that.

ping www.google.co.uk
ping: unknown host www.google.co.uk

The internet domain name is not resolving.

I have other computers on the LAN that are using the same gateway and
resolver addresses, and they are working fine.

Thanks in advance to anyone who can help.

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.
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  #2 (permalink)  
Old 02-21-2008, 12:20 PM
Mark Hobley
 
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Default Re: Network is unreachable

Mark Hobley <markhobley@hotpop.donottypethisbit.com> wrote:

> I don't appear to have a route tool on the other computers, which are
> Debian based, but I will investigate this.


The route command is part of net-tools, and I do have it. It is
installed in /sbin, so I needed a full path to access it:

/sbin/route from a working machine produces:

Destination Gateway Genmask Flags Iface
10.0.0.0 * 255.255.255.0 U eth0
default mercury.markhob 0.0.0.0 UG eth0

The default route is missing on the non-working machine.

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.
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  #3 (permalink)  
Old 02-21-2008, 12:20 PM
pk
 
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Default Re: Network is unreachable

Mark Hobley wrote:

> The default route is missing on the non-working machine.


What's the output if you run "/etc/init.d/net.eth0 restart" from the command
line?

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  #4 (permalink)  
Old 02-21-2008, 12:20 PM
Mark Hobley
 
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Default Re: Network is unreachable

pk <pk@pk.pk> wrote:

> What's the output if you run "/etc/init.d/net.eth0 restart" from the command
> line?


Unmounting network filesystems ...
Stopping eth0
Bringing down eth0
Shutting down eth0
Starting eth0
Bringing up eth0
10.0.0.13
Mounting network filesystems ...

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.
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  #5 (permalink)  
Old 02-21-2008, 12:20 PM
Mark Hobley
 
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Default Re: Network is unreachable

Johan Lindquist <spam@smilfinken.net> wrote:
> routes_eth0=( "default gw 192.168.2.1")


I changed mine from:

routes_eth0=( "default via 10.0.0.1" )

to

routes_eth0=( "default gw 10.0.0.1" )

It makes no difference. The default gateway information is being added
to the routing table by the startup scripts. I wonder if there is a bug.

If I manually type:

route add default gateway 10.0.0.1 eth0

The interface comes to life:

ping www.google.co.uk
64 bytes from ug-in-f104.google.com (66.249.93.104)

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.
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  #6 (permalink)  
Old 02-21-2008, 12:20 PM
pk
 
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Default Re: Network is unreachable

Mark Hobley wrote:

> pk <pk@pk.pk> wrote:
>
>> What's the output if you run "/etc/init.d/net.eth0 restart" from the
>> command line?

>
> Unmounting network filesystems ...
> Stopping eth0
> Bringing down eth0
> Shutting down eth0
> Starting eth0
> Bringing up eth0
> 10.0.0.13
> Mounting network filesystems ...


Ok, so it's not setting the default gateway, otherwise it would also
output "Setting default gateway...".

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  #7 (permalink)  
Old 02-21-2008, 12:20 PM
pk
 
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Default Re: Network is unreachable

pk wrote:

> Ok, so it's not setting the default gateway, otherwise it would also
> output "Setting default gateway...".


The actual message would be

adding routes
default via ....


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  #8 (permalink)  
Old 02-21-2008, 12:20 PM
Johan Lindquist
 
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Default Re: Network is unreachable

So anyway, it was like, 02:08 CET Jan 10 2008, you know? Oh, and, yeah,
Mark Hobley was all like, "Dude,
> Johan Lindquist <spam@smilfinken.net> wrote:


>> routes_eth0=( "default gw 192.168.2.1")

>
> I changed mine from:
>
> routes_eth0=( "default via 10.0.0.1" )
>
> to
>
> routes_eth0=( "default gw 10.0.0.1" )


I think I've seen both variants in different setup hints, so I guess
that's not the problem. Maybe that broadcast of yours is causing some
confusion, in case you haven't already changed that.

> It makes no difference. The default gateway information is being added
> to the routing table by the startup scripts. I wonder if there is a bug.


It all sounds very strange indeed.

You might try to re-merge baselayout, in case there's something wrong
with your /etc/init.d/net.eth0 script.

-----8<-----
sys-apps/baselayout-1.12.10-r5 (/etc/init.d/net.eth0 -> net.lo)
----->8-----

Sort of a longshot tho, sorry.

--
Time flies like an arrow, fruit flies like a banana. Perth ---> *
09:57:45 up 17:09, 2 users, load average: 1.05, 0.96, 0.86
Linux 2.6.23.12 x86_64 GNU/Linux Registered Linux user #261729
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  #9 (permalink)  
Old 02-21-2008, 12:20 PM
pk
 
Posts: n/a
Default Re: Network is unreachable

Mark Hobley wrote:

> Johan Lindquist <spam@smilfinken.net> wrote:
>> routes_eth0=( "default gw 192.168.2.1")

>
> I changed mine from:
>
> routes_eth0=( "default via 10.0.0.1" )
>
> to
>
> routes_eth0=( "default gw 10.0.0.1" )
>
> It makes no difference. The default gateway information is being added
> to the routing table by the startup scripts. I wonder if there is a bug.
>
> If I manually type:
>
> route add default gateway 10.0.0.1 eth0
>
> The interface comes to life:
>
> ping www.google.co.uk
> 64 bytes from ug-in-f104.google.com (66.249.93.104)


This is quite strange.
Are you setting anything else in /etc/conf.d/net besides config_eth0,
routes_eth0 and dns servers?

In your configuration statement
config_eth0=( "10.0.0.13 netmask 255.255.255.0 brd 10.255.255.255" )

it seems that the broadcast address is wrong (shouldn't that be 10.0.0.255
instead?). Anyway, I think that is not the source of your problem.

My only suggestions at this point are:

- make sure the syntax of /etc/conf.d/net is correct (eg, there are no rogue
characters, semicolons, dots, unbalanced parenthesis, etc.)

- try removing the dns_servers_eth0 line (putting the DNS servers manually
in /etc/resolv.conf instead), in case that line somehow indirectly affect
the process (just a shot in the dark anyway)

- try to explicitly use a specific/different interface handler, eg using

modules=( "ifconfig" )

or

modules=( "iproute2" )

in /etc/conf.d/net and see if that makes some difference. Note that the two
line are mutually exclusive (use only one of the two at a given time).

Hope this helps.

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  #10 (permalink)  
Old 02-21-2008, 12:20 PM
J.O. Aho
 
Posts: n/a
Default Re: Network is unreachable

On Thu, 10 Jan 2008, pk wrote:

> Mark Hobley wrote:
> > Johan Lindquist <spam@smilfinken.net> wrote:
> >> routes_eth0=( "default gw 192.168.2.1")

> > I changed mine from:
> > routes_eth0=( "default via 10.0.0.1" )
> > to
> > routes_eth0=( "default gw 10.0.0.1" )


Looking at my setup, it should be

routes_eth0=( "default via 1.2.3.4" )


> In your configuration statement
> config_eth0=( "10.0.0.13 netmask 255.255.255.0 brd 10.255.255.255" )
>
> it seems that the broadcast address is wrong (shouldn't that be 10.0.0.255
> instead?). Anyway, I think that is not the source of your problem.


*nods* Broadcast is only the last part that is changed to 255 and nothing
else.



> - try removing the dns_servers_eth0 line (putting the DNS servers manually
> in /etc/resolv.conf instead), in case that line somehow indirectly affect
> the process (just a shot in the dark anyway)


That works as long as he don't have dhcp installed, that tends to mess
things up.


> - try to explicitly use a specific/different interface handler, eg using
> modules=( "iproute2" )
> in /etc/conf.d/net and see if that makes some difference. Note that the two
> line are mutually exclusive (use only one of the two at a given time).


and see to install iproute2 before trying to use the second one.


--
//Aho

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