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Your server has two fully functional NICs with correct IP configuration. The server is not forwarding traffic between the NICs. Which command will enable forwarding properly?
A. setparam 1 > /proc/sys/net/ipv4/ip_autoconfig
B. echo 1 > /proc/sys/net/ipv4/ip_forward
C. cat $1 > /proc/sys/net/ethernet
D. set $=1 /proc/sys/net/ipv4/route
Correct Answer: B
Explanation/Reference:
See http://www.ibm.com/developerworks/linux/library/l-proc.html
# cat /proc/sys/net/ipv4/ip_forward
0
# echo "1" > /proc/sys/net/ipv4/ip_forward
Remember that this solution is working only until reboot, use sysctl to set ip_forwarding permanently.
