While working with VMware Photon OS, I was seeing an issue where I configured IP addresses successfully, but ping (ICMP) was not working from outside. This occurs due to ICMP (ping) traffic is blocked by default in Photon OS’s iptables firewall rules.
To resolve this and allow ping functionality, by adding a couple of iptables rules to permit ICMP echo requests and replies.
Run these below commands, which will allow all outgoing and incoming ICMP (ping) traffic in system.
Note: Although by running just these commands ping will work but these setting will not persist or survive reboot.
# Allow all outgoing ICMP traffic (e.g., for pinging other machines, sending replies) iptables -A OUTPUT -p icmp -j ACCEPT # Allow all incoming ICMP traffic (e.g., to allow others to ping your server) iptables -A INPUT -p icmp -j ACCEPT
Below command captures the current iptables configuration and saves it in a file for later use, This restore or reuse the rules for future firewall configurations.
iptables-save > /etc/systemd/scripts/ip4save
In the last restart iptables daemon. This setting will persist and you will be able to ping even after reboot.
systemctl restart iptables
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