Re: how to find out address of gateway if ip packet's destinationis outside of the current network ?

[Tomar, Nagendra (nagendra_tomar@adaptec.com)]

ip_route_output (the route table lookup function) might be helpful.

tomar

On Wed, 10 Sep 2003, Andreas Schaufler wrote:

> Dear all,
> 
> I am currently porting a  backplane networking system to Linux which 
> shall be able to do IP over PCI,CPCI, VME etc.
> 
> Therefore i am currently developing a Linux network driver which is 
> using some lower level comminications API in order to transport IP 
> packets between several CPU boards (PPC), which are connected through 
> the busses mentioned above.
> The system is using an internal replacemant for ARP.  It is looking for 
> the destination address in the IP header and looking up the destination 
> CPU in some internal table where every CPU is accociated with an IP 
> address. Afterwards the IP packet is sent to this CPU and there it is 
> put into the IP Stack.
> 
> My problem is: If the destination address is outside of the backplane 
> networking system (some CPU boards can have ethernet plugs) I need to 
> find out the gateway, which will send the packet to the outside network.
> 
> I guessed I could get this information out of void *daddr in the 
> hard_header function of the net device, but I was not successfull. Is 
> there a way to solve my problem ?
> 
> thank you very much for your answers in advance
> best regards
> -Andreas
> 
> 
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