On Tuesday 2011-01-11 04:22, Roc Bai wrote: >>> Dear all: >>> Â Â in my service, there are four net card. Âeth0, eth1, eth2, eth3. I >>> want to forward the data in from eth0 to eth1, eth2, eth3 with >>> different application protocol. Does some body send me some ideas on >>> it? >> >> If you want to re-route packages, that has to happen in pre-routing. >> If you want to use DNAT for examples, just add a rule to the >> PREROUTING chain in the nat table. > >I think the DNAT should change the package data, including the IP or >higher level protocol header, isn't it? That is the point of NAT. NAT is _not_ routing/forwarding (dammit). And it's "packet", not "package". >I think the best idea which can redirect the package is to add/change >the route rule to do it. I have write some source codes which doesn't >work. That's redundant (and as you can see, error prone). Just use the iproute utilities to define extra rules and routes, which are known to work. >ncf_get_entry() can generate a dst_entry whose dev point to the eth2 >net_device structure. But when i use tcpdum -i eth2. I cannot get the >package from eth0. So it doesn't work. I don't expect it to. You are using a global variable, which is not SMP-safe without a lock. You might find Paul McKenny's Parallel Programming Book helping. >static struct dst_entry gdst; >static int ncfflag = 0; -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
