CORRECT TEXT
You build and configured a bastion host to act as a router between two internal networks. Both
eth0 and eth1 can see hosts on their respective networks, but the hosts on each network cannot
see any hosts on the other network. After verifying that the hosts have the correct gateway route,
you decide the bastion host does not have IP forwarding turned on. To check this cat the file
/proc/sys/net/ipv4/ _______ to ensure it has a 1.

Answer: ip_forward