allow for icmp reply to arrive on different interface then the sending one

[Bl4d3s]

Problem:

device has connectivity via wlan0 and eth0 in the same network (same ip network):

• icmp replies arrive only on one interface (probably the faster one).
• it is not always the same interface (can be either one)

Solution:

• change icmp message id to include fd number of interface along the pid
• check if fd matches the receiving, if not look for an interface with matching fd and process the reply for this interface

[br101]

Thanks!