By default, Checkpoint firewalls will not let pings pass through them. However, when you first setup a network, it’s useful to be able to test wide open through the firewall to verify routing and connectivity. Here is how to enable IP forwarding.
Permanent Changes, Survives Reboot (sysctl)
- Check IP Forwarding using sysctl
-
sysclt net.ipv4.ip_forward - Enable IP Forwarding using sysctl
-
sysctl -w net.ipv4.ip_forward=1 sysctl -p /etc/sysctl.conf
Temporary Changes, Does not Survive Reboot (/proc)
- Check IP Forwarding using /proc
-
cat /proc/sys/net/ipv4/ip_forward - Enable IP Forwarding using /proc
-
echo 1 > /proc/sys/net/ipv4/ip_forward
Other OS Notes:
- RHEL
-
service network restart - Various Linux
- edit /etc/sysconfig/sysctl:
IP_FORWARD="yes"