Score:0

iptables ping before accept

cu flag

is there anyway that I can block all UDP connections on specific host:port and allow whitelisting based on ping? Ex. I'm trying to connect first time to UDP socket, and it will first ping the IP and than add my IP to whitelist. If no response, DROP it. Is that even possible?

ng flag
It's called port knocking. But you'll have to use something more unique than a ping packet.
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