Thread: I am not able to ping to internet domain

4 systems LAN(xyz): 1
GW 182.178.3.1 system G
182.178.3.21 system B
182.178.3.22 system C
182.178.3.20 system A

xyz connected to other LAN(pqr)-> gw 20.182.3.2 -> connected to internet.

Currently there is no access to system B to internet
How can I do this using iptables and what else

Set default gateway using route command.