> It is like a port knocking service but a little bit different:
> 
> Normaly a port knocking service uses TCP/UDP, but openportd
> uses ICMP echo response packets because they are not so easy
> to send like echo requests or TCP/UDP port tests (kiddies could
> simply use ping or nmap for this job).
> 
> You can define keys and actions in /etc/openportd.conf. If a
> key is received, an action is executed. Here are examples:
> 
> 04t3904jg034 reboot
> 0987654321   pkill sshd
> 1234567890   /usr/sbin/sshd
> 40tg340503n5 pf/iptables (load some other rules or whatever)

This sounds like authpf done on a trip.
And do you really mean to kill sshd upon receiving an ICMP packet?!

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