Re: VLAN over loopback interface

[Khoa Nguyen]

Thanks. Changed our code to use dummy0 instead. Working like a charm!

On Mon, Mar 3, 2008 at 4:35 PM, Christopher Fowler
<cfowler@xxxxxxxxxxxxxxxxxxx> wrote:
> 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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