IPv6 over IPv4 tunneling and notification confusion?

["pradeep singh" <2500.pradeep@xxxxxxxxx>]

Hi All,

The IPV6 over IPv4 driver is loaded in my kernel during load time.
I was experimenting with netdevice notifiers.

I observed that on doing
$ifconfig eth0 down

my notifier function is called twice instead of once.

If i do

$ifconfig eth0 up

my notifier function is again called but this time only once.

My assumption is, this is because of the IPv6 over IPv4 tunnelling
driver which makes a pseudo IPv6 device and is existent as sit0 along
with eth0.
When i bring the eth0 down it takes down sit0 first and then is shut
down. To kernel they are two device eth0 and sit0 , and thus two
notification events.

And only one when i do eht0 up, may be because i have built the eth0
driver statically into the kernel and thus a notification is generated
only for IPv6 tunnelling module during ifconfig eth0 up.

I know i am talking wrong mostly, but it my guess .

Any help, why is this happening this way?

Thanks

--psr


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