eth_get_pcap_devname as a wrapper.
In addition to the hardware address check, add a check of the textual interface
descriptions in order better to distinguish interfaces. It appears to me that
the pcap description (pdev->description) is the same as what is returned by a
call to PacketRequest with an OID of OID_GEN_FRIENDLY_NAME, so that's what I'm
comparing. That differs from OID_GEN_VENDOR_NAME, which is what you get in
ifrow.bDescr from GetIfTable.
We've found that simply comparing hardware addresses is not enough when using
Windows "teamed" (link-aggregated) interfaces. In a simple example, two NICs
are teamed together, leading to three interfaces visible to libdnet: the two
physical NICs and the virtual teamed interface. All three of these have the
same MAC address. What was happening was the eth0 interface was being assigned
to one of the physical NICs, packets were sent over it, but the replies were
not necessarily coming back to the same physical NIC.
addresses if matching IP addresses fails. I have a feeling this is more
reliable than matching IP addresses, but as I'm not sure, I have made it the
backup so that nothing will stop working that was working before. The MAC
address matching works fine for me if I disable the IP address matching. The
code is adapted from libdnet 1.11.
