My Device is connected to eth1 interface of the host and eth0 is connected to network.
Now when I am pinging google.com from device after executing below commands on host
sudo iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
I am seeing in wireshark at eth0, that during ping request source ip changes from DUT ip to host ip (i.e eth0 ip)
but that does not happen while ping reply , destination IP remains host IP only.
Why does it not show DUT ip as destination IP , Technically my final destination is DUT
For example:
host IP is x.x.x.x
DUT ip is y.y.y.y
pinging from x.x.x.x
on wireshark:
ping request x.x.x.x to google.com -----> this I understood that it is due to masquerading and NAT
ping reply google.com to y.y.y.y expected but I see google.com to x.x.x.x -----> why no Masquerading here?