![]() It can be used to view and analyze the network structure and connections between hosts and services. Visualization: Zenmap provides an intuitive user interface with graphical representations of a network.It can be used to detect open ports, services and vulnerabilities, as well as to identify weak passwords or other security issues. Security Auditing: Zenmap can be used for security auditing and testing.It can be used to identify hosts and services on a network, as well as to detect vulnerabilities and potential security issues. Discovery: Zenmap provides quick and easy discovery of active hosts and services on a network.Zenmap provides an easy-to-use graphical interface to the Nmap port scanning tool. It is designed to be useful for both novice and experienced network administrators. Zenmap allows for easy discovery of hosts and services on a computer network, as well as vulnerability scanning and auditing. It is the official GUI of the Nmap Security Scanner, and the most popular port scanning tool available. Nmap done: 1 IP address (1 host up) scanned in 5.Zenmap is an open source network exploration, security auditing, and visualization tool. ~]$ sudo ip netns exec testns nmap -sA -n 5.5.5.6 Ip netns exec testns ifconfig veth1 $Īnd you should see your scan run as if it actually came from 5.5.5.5. Ip link add veth0 type veth peer name veth1 Ip netns exec testns ip link set dev lo up In the end, the script to create the network looked like this: test_source_ip='5.5.5.5' ![]() I followed the guide here to create a namespaced network. This means that packets sent across namespaces appear to come from an external network and are not considered local packets. A namespaced virtual network has its own virtual network interfaces and routing tables separate from other namespaced networks, including the root network namespace. The solution is to create a namespaced virtual network to run the scan from. Therefore the nmap scanning packets will always end up on the loopback interface (and effectively miss the firewall) even when explicitly specifying the interface to bind to. Additionally, the local routing table is automatically maintained (rules are added/removed when bringing interfaces up/down) and cannot be manually altered. You can see the local routing table with ip route show table local - all packets matching a rule in the local routing table are looped back. The problem is that the Linux routing tables always route traffic locally through the loopback interface and do not put it on the physical network if the local system has a network interface listening for the destination IP address. So why can I not see these results when scanning my-host from itself? Is this due to the router configuration (which unfortunately I don't have access to), or am I making a mistake somewhere? Nmap done: 1 IP address (1 host up) scanned in 4.51 seconds When I scan it from another host on the same network, that is what I see: % sudo nmap -sA my-host -Pn However, I know that, in its firewall, the host allows at least port 22 from any other host on the same network. Nmap done: 1 IP address (0 hosts up) scanned in 0.44 seconds But nmap can't find any open ports: % sudo nmap -sA my-host -e ens192 -Pn So I tried specifying the interface to use, hoping to force the scan to route traffic through the host's normal network interface. Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds Pkts bytes target prot opt in out source destinationĢ364K 123M ACCEPT all - lo any anywhere anywhereĪnd consequently, when I scan the host, all ports appear to be allowed by the firewall: % sudo nmap -sA my-host This is a problem because the firewalls on the hosts that I care about allow all traffic on the loopback interface: % sudo iptables -vLĬhain INPUT (policy ACCEPT 0 packets, 0 bytes) Normally, if you run a port scan with nmap against the current host, nmap will use the loopback interface. ![]() ![]() The problem is that I can only run the audit on the host itself. This is typically pretty straightforward to do with nmap or a similar scanning tool. I'm trying to audit firewall rules on a host.
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