LPIC-2 Certified Linux Engineer (202-450) (#46)

On a Linux router, packet forwarding for IPv4 has been enabled. After a reboot, the machine no longer forwards IP packets from other hosts. The command:

echo 1 > /proc/sys/net/ipv4/ip_forward

temporarily resolves this issue. Which one of the following options is the best way to ensure this setting is saved across system restarts?

Add echo
1 > /proc/sys/net/ipv4/ip_forward
to the root user login script
Add echo
1 > /proc/sys/net/ipv4/ip_forward
to any user login script
In
/etc/sysct1.conf
change
net.ipv4.ip_forward
to
1
In
/etc/rc.local
add
net.ipv4.ip_forward = 1
In
/etc/sysconfig/iptables-config
add
ipv4.ip_forward = 1