umardx/test_inbound_ports.md

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Assume there are two servers 192.168.1.1 as the tester, and 172.16.8.1 as the target. We will test which open inbound ports on the target server.

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test_inbound_ports.md

Assume there are two servers 192.168.1.1 as the tester, and 172.16.8.1 as the target. We will test which open inbound ports on the target server.

PREROUTE all traffic from IP 192.168.1.1/32 to port 127.0.0.1:80

iptables -t nat -A PREROUTING -s 192.168.1.1/32 -p tcp -m tcp --dport 80 -j RETURN
iptables -t nat -A PREROUTING -s 192.168.1.1/32 -p tcp -j DNAT --to-destination :80

Log everything from IP 192.168.1.1/32

iptables -I INPUT -s 192.168.1.1/32 -p tcp -m tcp -m state --state NEW -j LOG --log-level 1 --log-prefix "New Connection "