[lug] An odd networking question

[Kenneth D Weinert]

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Sean Reifschneider wrote:
> On 10/17/2009 10:01 AM, Kenneth D Weinert wrote:
>> 192.168.1.0     *               255.255.255.0   U     0      0   0 eth0
>> 192.168.1.0     *               255.255.255.0   U     2      0   0 wlan0
>> link-local      *               255.255.0.0     U     1000   0   0 eth0
>> default         192.168.1.1     0.0.0.0         UG    0      0   0 wlan0
>> default         192.168.1.1     0.0.0.0         UG    100    0   0 eth0
> 
> You have both interfaces up, you probably do not want that.  You almost
> certainly want to take down the interface that you aren't using.  If you
> are using the Network Manager applet (ISTR that you were using
> NetworkManager), you can right click on it and un-check "Enable Wireless"
> to get rid of the wireless when you are using wired.  Then re-enable it
> when you want to use it again.
> 
> Try that and see if that makes it work how you would like.

When I do this, my /etc/resolv.conf becomes an empty file again.  Now, I
made a copy of it before turning off wireless and when I copy it back in
then I can get out to the internet just fine (at least if this mail
shows up I did :)

It'd be nice to be able to be on wireless until I plugged into the
docking station and then the eth0 would take over and vice versa when I
unplugged.

I'm sure it can be done - any pointers on what to search for?

Thanks, by the way, for all the help so far

And, to answer a later question, ifconfig with both interfaces on:

eth0      Link encap:Ethernet  HWaddr 00:1e:68:76:6b:85
          inet addr:192.168.1.10  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:68ff:fe76:6b85/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3089 errors:0 dropped:0 overruns:0 frame:0
          TX packets:651 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:407016 (407.0 KB)  TX bytes:104131 (104.1 KB)
          Interrupt:252 Base address:0xc000

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:1132 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1132 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:41643 (41.6 KB)  TX bytes:41643 (41.6 KB)

wlan0     Link encap:Ethernet  HWaddr 00:1f:e1:42:d0:d7
          inet addr:192.168.1.109  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::21f:e1ff:fe42:d0d7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:26653 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20596 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:24087220 (24.0 MB)  TX bytes:3470325 (3.4 MB)

wmaster0  Link encap:UNSPEC  HWaddr
00-1F-E1-42-D0-D7-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

And as soon as I disabled wireless after pasting this my resolv.conf was
once again empty.

- --
Ken
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