WIDE SCREENS ONLY

The lab shows your knock pad, the server's iptables log and the firewall side by side. Open it on a laptop or desktop, in a window at least 1100 px wide.

episode 1 · interactive lab

PORT KNOCKLAB

A simulated server at 203.0.113.7 keeps SSH (port 22) behind a firewall that drops everything. Knock your way in, then let the attacker try.

LOCKS

    KNOCK PAD sending as 203.0.113.10

    QUEST

    FIREWALL iptables INPUT

      SNIFFER the attacker at 203.0.113.66 reads the wire

        IPTABLES LOG server:/var/log/messages

        root@server:~# tail -f /var/log/messages