Is it normal behaviour of the IP stack that it DOES NOT process
ARP replies that do not result from requests sent by that stack
itself? Or do I have something misconfigured? See below.
I need to learn the MAC address of a remote network node
in an application executing as 'root' on Linux 2.4.19.
The MAC address IS NOT in the ARP cache, so ioctl()
fails. I'm building the ARP request and sending it myself
thru a packet socket. That's OK. And the reply is received
from the destination node. However... the IP stack on my machine
doesn't seem to handle the ARP reply! The resulting MAC address
IS STILL NOT in the cache! ioctl() still fails!
Scenario 2) (obvious)
I'm sending a piece of data through a plain datagram socket
to the remote node, my stack handles the ARP resolution
on my behalf and I after that I can see the resulting
MAC address in the cache.
I sniffed the ARP frames in both scenarios and undoubtedly
they are byte-after-byte the same.
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This archive was generated by hypermail 2b29 : Mon Jun 30 2003 - 22:00:01 EST