Built inbound ICMP connection for faddr 10.1.6.3/1 gaddr 10.24.5.2/0 laddr 10.4.1.2/0
A five second google search told me that:
faddr = foreign address
gaddr = global address (after NAT)
laddr = local address (pre NAT)
Since this is an inbound connection, the source IP address is the foreign one : 10.1.6.3
The original destination address is 10.24.5.2
which has been translated to the final destination address 10.4.1.2