I don't think this is a good idea.
1. You might never send a packet to the MAC you received the packet from.
In that case the enrty for this MAC will not appear in the routing-table.
(I actually say this configuration in some ISPs)
2. Even if you do, maybe you receive packets from this MAC on a different
interface than that you send on.
3. What about a sniffer in promiscuous mode, then nothing appears in your
ARP/routing tables. so you can't tell anything.
Hayim.
On Mon, 18 Jul 2005 kdenki@xxxxxx wrote:
Actually, I want to find out the device (its index )on which an incoming
packet arrived. Is there a better way to do it? (One that works allways?)
You can look in the routing Table with the reverse adress (change source and destination adress). There you schould find the device where you got the packet from.
I hope this is corect for every case.
CU
Katharina
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