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Problems bringing up a second virtual network interface
https://forum.linode.com/viewtopic.php?f=19&t=9599		 Page 1 of 1
Author:  tubaguy50035 [ Wed Dec 05, 2012 6:33 pm ]
Post subject:  Problems bringing up a second virtual network interface
I'm having issues adding a second IP address to one interface. Below is my
Code:
/etc/networking/interfaces


Code:
    # The loopback network interface
        auto lo
        iface lo inet loopback
    
    # The primary network interface
    auto eth0 eth0:0 eth0:1
    
    #eth0 is our main IP address
    iface eth0 inet static
     address 198.58.103.*
     netmask 255.255.255.0
     gateway 198.58.103.1
    
    #eth0:0 is our private address
    iface eth0:0 inet static
     address 192.168.129.134
     netmask 255.255.128.0
    
    #eth0:1 is for www.site.com
    iface eth0:1 inet static
     address 198.58.104.*
     netmask 255.255.255.0
     gateway 198.58.104.1



When I run
Code:
/etc/init.d/networking restart
, I get several errors about resolv.conf and then a fail error about bringing up eth0:1:

Code:
    resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
    ssh stop/waiting
    ssh start/running, process 23229
    RTNETLINK answers: File exists
    Failed to bring up eth0:1.


Any reason this would be? I didn't have any problems with I first set up eth0 and eth0:0.
Author:  mnordhoff [ Wed Dec 05, 2012 6:41 pm ]
Post subject:  Re: Problems bringing up a second virtual network interface
Remove the 'gateway' line from eth0:1.

BTW, the /etc/resolv.conf thing isn't an error, exactly. The system is just whining that automatic management of the file is disabled. If that's what you want, it's not an error.
Author:  tubaguy50035 [ Wed Dec 05, 2012 6:48 pm ]
Post subject:  Re: Problems bringing up a second virtual network interface
Removed the gateway line and am still seeing the error. I've also tried manually bringing down the interfaces and then bringing them back up.
Code:
sudo ifdown eth0:1
ifdown: interface eth0:1 not configured

Code:
sudo ifup eth0:1
RTNETLINK answers: File exists
Failed to bring up eth0:1.
Author:  tubaguy50035 [ Wed Dec 05, 2012 7:03 pm ]
Post subject:  Re: Problems bringing up a second virtual network interface
I rebooted and that fixed my problem...

Is there a correct way to restart networking? I was doing /etc/init.d/networking restart.
Author:  Vance [ Thu Dec 06, 2012 8:59 am ]
Post subject:  Re: Problems bringing up a second virtual network interface
Note that a reboot is necessary to add a new IP address (this is a Linode requirement, not a Linux one).
Author:  Yifan [ Sat Dec 08, 2012 11:19 pm ]
Post subject:  Re: Problems bringing up a second virtual network interface
The linode tutorial is unclear about the reboot. After adding interfaces, the tutorial says now you can ping the gateway. In fact, you won't be able to ping the second gateway until you reboot.
Author:  tubaguy50035 [ Thu Dec 20, 2012 4:58 pm ]
Post subject:  Re: Problems bringing up a second virtual network interface
Vance wrote:
Note that a reboot is necessary to add a new IP address (this is a Linode requirement, not a Linux one).


Any reason why? A Zen thing?
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