Hi,
I have a problem of the netfilter HOOK point. I load my handle function in
HOOK point NF_IP6_LOCAL_OUT. But, its behavior is likely to be in the HOOK
point NF_IP6_POST_ROUTING. The detail is shown as follows:
I configrue a 6to4 tunnel between two linux hosts (2.6 kernel) by adding a
interface "6to4tun". The route table in one of the host is:
2002:c0a8:101::/48 dev 6to4tun
default via 3ffe:250:cccc::1 dev eth0
The 6to4 tunnel works well before I load my own handle function in the hook
point NF_IP6_LOCAL_OUT.
In the hook point NF_IP6_LOCAL_OUT, my handle funtion changes the destination
address of the packet from global ipv6 address (ex. 3ffe:250:cccd::2) to 6to4
address (ex. 2002:c0a8:101::1). In my expection, after changing the destination
address in hook point NF_IP6_LOCAL_OUT, the host will look up the route table
according the destination address, which is a 6to4 address. And then the host
will send the packet from the interface "6to4tun". However, the experiment
result is: the packets are sent from the interface eth0. It seems that the host
looks up the route table according the global address. That means my own
function seems to work in the hook point NF_IP6_POST_ROUTING.
What is the problem?
Thank you in advance for any help!
Lizhong Xie
2006-12-20
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