You have a Linux system routing 3 networks through 3 separate NICs and are having trouble with your IP forwarding.
What file would you check to ensure that IP forwarding is enabled?
A.
/etc/defaultrouter
B.
/proc/net/tcp
C.
/proc/sys/net/ipv4/ip_forward
D.
/var/log/messages
Explanation/Reference:
From http://techgurulive.com/2008/09/15/how-to-enable-ip-forwarding-in-linux-2:To check for current status of IP forwarding on IPv4 IP class
# cat /proc/sys/net/ipv4/ip_forward
If IP forwarding is disabled, a value of 0 would be displayed and if IP forwarding is enabled, linux should be displaying a numerical value of 1.