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Re: Re: network loopback based kernle module and ping - calrification question
Hi Mark
1) It works also after "ifdown lo".
OK, one possibility is out of the ring.
2) I also tried setting "inet addr:128.0.0.1 Mask:255.0.0.0" in
/etc/sysconfig/network-scripts/ifcfg-nic and than
"ping 128.0.0.1" and it also send a resoonse to ping.
So, actually we can say that "something" was indeed responding. We just
don't know which adapter it is. I wonder, could you paste the output of
your routing table?
So my question is still the same :
who does answer me ? there is no handling of recieve interrupts in
that module.
What causes the packet which is sent to 128.0.0.1 to give this answer ?
where is this mechanism implemented in the kernel ?
If I read your e-mail correctly and after comparing it to the original
loopback.c in either 2.4.x and 2.6.x, I realize that there isn't
something like netif_rx(skb) in your code. But in the other hand, I saw
that several fields of net_device (correct?) are left untouched (I
believe that means they are set as zero, since static allocation is
initialized as zero IIRC). I can not really suggest anything meaningful
here, but you could try to explicitly set several fields such as "flags"
and see if it changes the situation.
Also, I am interested with this (taken from your ifconfig output)
Link encap:AMPR NET/ROM
From ifconfig manual, that means it represents netrom type (not sure
what it is). I am just guessing, could it be related? Try to set it as
loopback or ethernet and again see if something changes.
Hope that helps you to track the problem.
regards,
Mulyadi
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