Re: VLAN over loopback interface

[Christopher Fowler]

What about using VLAN on the dummy network driver?

On Mon, 2008-03-03 at 16:14 -0500, Khoa Nguyen wrote:
> Hi,
> 
> I notice 2.6.18 and 2.6.24 behave differently when I tried to
> configure a vlan interface over loopback (I know, it's silly to create
> a vlan over loopback, but our legacy app depends on it). But why under
> 2.6.24, a vlan over loopback assumes Ethernet encapsulation? And I
> can't assign IP address or bring this interface up under 2.6.24. What
> should I do to make sure it uses "Local Loopback" encapsulation?
> 
> Thanks,
> Khoa
> 
> 
> 2.4.18.1 kernel:
> ===========
> [root@mss2 ~]# vconfig add lo 50
> Added VLAN with VID == 50 to IF -:lo:-
> 
> [root@mss2 ~]# ifconfig lo.50 192.0.2.2 netmask 255.255.255.255 up
> [root@mss2 ~]# ifconfig lo.50
> lo.50     Link encap:Local Loopback
>           inet addr:192.0.2.2  Mask:255.255.255.255
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  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:0
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> 
> 
> 
> 2.6.24 kernel
> =========
> vconfig add lo 50
> Added VLAN with VID == 50 to IF -:lo:-
> [root@mss2 os]# ifconfig lo.50
> lo.50     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
>           LOOPBACK  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:0
>           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
> [root@mss2 os]# ifconfig lo.50 192.0.2.2 netmask 255.255.255.255 up
> SIOCSIFFLAGS: Invalid argument
> SIOCSIFFLAGS: Invalid argument
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