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Old 10-26-2011, 06:32 AM
"Kevin O'Gorman"
 
Default Recovering broken system

I have a Natty system in which I'm upgrading some disks.* In the process the system became unbootable (even with the original disks that I put back in).* I don't know how.
I have been unable to install grub from a live disk, or at least to do it so that it worked.* Mostly it just silently pouted at me.


So I used a Natty live disk to install a working system, from which I hope to do better with grub.* At least it boots reliably; I'm going to sleep before I try this.

The problem: I configured my two ethernet interfaces, and they seem to be up, but they don't work.* I think it's that the kernel routing table has no gateways configured, since

my attempts to configure routes in* System->Preferences->Network Connections do not appear in the results of "route -n".* I'm probably doing something really stupid,
or not doing some simple but required thing, but someone will have to tell me what it is.

Help?
--
Kevin O'Gorman, PhD


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Old 10-26-2011, 08:33 AM
David Shochat
 
Default Recovering broken system

On Wed, Oct 26, 2011 at 2:32 AM, Kevin O'Gorman <kogorman@gmail.com> wrote:
>
> The problem: I configured my two ethernet interfaces, and they seem to be
> up, but they don't work.* I think it's that the kernel routing table has no
> gateways configured, since

Can you ping your would-be default gateway?

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Old 10-26-2011, 12:05 PM
Joseph Loo
 
Default Recovering broken system

On 10/25/2011 11:32 PM, Kevin O'Gorman wrote:

The problem: I configured my two ethernet interfaces, and they seem to
be up, but they don't work. I think it's that the kernel routing table
has no gateways configured, since
my attempts to configure routes in System->Preferences->Network
Connections do not appear in the results of "route -n". I'm probably
doing something really stupid,
or not doing some simple but required thing, but someone will have to
tell me what it is.

Help?
--
Kevin O'Gorman, PhD





Do /sbin/ifconfig. see if the ethernet connection is configured
properly. It should have your ip-address shown somewhere. Mine shows up
like this


/sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:1C:C0:8E:16:52
inet addr:192.168.21.15 Bcast:192.168.21.255 Mask:255.255.255.0
inet6 addr: fe80::21c:c0ff:fe8e:1652/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10576121 errors:0 dropped:0 overruns:0 frame:0
TX packets:14942795 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7067333300 (6739.9 Mb) TX bytes:6104087688 (5821.3 Mb)
Interrupt:27 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:11520219 errors:0 dropped:0 overruns:0 frame:0
TX packets:11520219 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15095242989 (14395.9 Mb) TX bytes:15095242989
(14395.9 Mb)


wlan0 Link encap:Ethernet HWaddr 00:1D:6A:44B:83
inet addr:192.168.20.15 Bcast:192.168.20.255 Mask:255.255.255.0
inet6 addr: fe80::21d:6aff:fe44:db83/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:11392824 errors:0 dropped:0 overruns:0 frame:0
TX packets:115191 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3538175720 (3374.2 Mb) TX bytes:1371190 (1.3 Mb)
Interrupt:21

--
Joseph Loo
jloo@acm.org

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Old 11-04-2011, 03:33 PM
"Kevin O'Gorman"
 
Default Recovering broken system

On Wed, Oct 26, 2011 at 5:05 AM, Joseph Loo <joseph.loo@dslextreme.com> wrote:
> On 10/25/2011 11:32 PM, Kevin O'Gorman wrote:
>>
>> The problem: I configured my two ethernet interfaces, and they seem to
>> be up, but they don't work. *I think it's that the kernel routing table
>> has no gateways configured, since
>> my attempts to configure routes in *System->Preferences->Network
>> Connections do not appear in the results of "route -n". *I'm probably
>> doing something really stupid,
>> or not doing some simple but required thing, but someone will have to
>> tell me what it is.
>>
>> Help?
>> --
>> Kevin O'Gorman, PhD
>>
>>
>>
>
> Do /sbin/ifconfig. see if the ethernet connection is configured properly. It
> should have your ip-address shown somewhere. Mine shows up like this
>
> /sbin/ifconfig
> eth0 * * *Link encap:Ethernet *HWaddr 00:1C:C0:8E:16:52
> * * * * *inet addr:192.168.21.15 *Bcast:192.168.21.255 *Mask:255.255.255.0
> * * * * *inet6 addr: fe80::21c:c0ff:fe8e:1652/64 Scope:Link
> * * * * *UP BROADCAST RUNNING MULTICAST *MTU:1500 *Metric:1
> * * * * *RX packets:10576121 errors:0 dropped:0 overruns:0 frame:0
> * * * * *TX packets:14942795 errors:0 dropped:0 overruns:0 carrier:0
> * * * * *collisions:0 txqueuelen:1000
> * * * * *RX bytes:7067333300 (6739.9 Mb) *TX bytes:6104087688 (5821.3 Mb)
> * * * * *Interrupt:27 Base address:0xe000
>
> lo * * * *Link encap:Local Loopback
> * * * * *inet addr:127.0.0.1 *Mask:255.0.0.0
> * * * * *inet6 addr: ::1/128 Scope:Host
> * * * * *UP LOOPBACK RUNNING *MTU:16436 *Metric:1
> * * * * *RX packets:11520219 errors:0 dropped:0 overruns:0 frame:0
> * * * * *TX packets:11520219 errors:0 dropped:0 overruns:0 carrier:0
> * * * * *collisions:0 txqueuelen:0
> * * * * *RX bytes:15095242989 (14395.9 Mb) *TX bytes:15095242989 (14395.9
> Mb)
>
> wlan0 * * Link encap:Ethernet *HWaddr 00:1D:6A:44B:83
> * * * * *inet addr:192.168.20.15 *Bcast:192.168.20.255 *Mask:255.255.255.0
> * * * * *inet6 addr: fe80::21d:6aff:fe44:db83/64 Scope:Link
> * * * * *UP BROADCAST RUNNING MULTICAST *MTU:1500 *Metric:1
> * * * * *RX packets:11392824 errors:0 dropped:0 overruns:0 frame:0
> * * * * *TX packets:115191 errors:0 dropped:0 overruns:0 carrier:0
> * * * * *collisions:0 txqueuelen:1000
> * * * * *RX bytes:3538175720 (3374.2 Mb) *TX bytes:1371190 (1.3 Mb)
> * * * * *Interrupt:21


I can have the right info, and still have things not work. Most of
the time it appears that it helps to do "ifconfig eth0 down" and
"ifconfig eth0 up". Most of the time. I get the impression that
sometimes just waiting helps, though I'm less sure of that one. Some
of my problems turned out to be with the default route, which ifconfig
does not show; I use "route -n" for that. Sometimes things have hung
because of the name server IPs. I still have no idea why they show up
in /etc/resolv.conf sometimes and not others. I sure wish that the
"network connections" thingie would push this stuff out when I click
"save", but sometimes when I go back in, what I see is *not* what I've
got.

Still working on it. My current problem is that I can't seem to go
back to DHCP when I want to. I need to do this to check out my
Linksys BEFSR41 DSL router; its web page appears to DHCP clients only.
I think.

Grrrrrrr.

--
Kevin O'Gorman, PhD

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