![]() ![]() All ssh connections from the external network are redirected to VM4.All http connections (port 80) are redirected to VM3.VM1 will only be able to open ssh connections(port 22) and http connections (port 80) with VM2.Use iptables to configure the following requirements: Install the firewall and test this rule.Set the original address (VM1), service and redirect address (VM3).Add the necessary rule in the NAT table.Add the IP address for VM3 in addresses ( Objects -> New Address).The goal is to redirect telnet connections from VM1 to VM2 into telnet connections from VM1 and VM3. If you are uncertain about the origin, destination and redirection of certain packets, tcpdump is a good way to make sense of the traffic. Make sure the relevant virtual machines have their gateway configured appropriately. This is an introductory exercise to what you will find in 4, and similar to what you did in 2.2. After executing the instructions above, what happens when you try to telnet from VM1 to VM2?.Did you manage to create a telnet connection from VM1 to VM2 in the beginning?.Test the telnet connections from VM1 to VM2 The default location for it is the current user's home directory.įwbuilder requires that the machine accepts ssh connections in order to install new firewall rules.Ĭreate a folder to store the firewall rules (in the shell execute):Ĭreate a new TCP service with destination port 23.Ĭreate a new rule accepting connections to this new service. Save the current project file, in case something happens.Choose Edit in the dropdown and then check Management Interface checkbox). Set one of the interfaces as a management interface (you may do this by right-clicking one of the interface icons in Firewalls -> sirs-fw-test assuming that was the name you gave the firewall.You should configure the interfaces in the firewall accordingly.For each, you should fill in the following fields:.The information to be given to each network interface configuration may be displayed through the command: ifconfig The following window should have two radio buttons with only the Configure interfaces manually option selected.Choose OS the new firewall runs on: Linux 2.4/2.6.Choose firewall software it is running: iptables. ![]() The name may be something such as sirs-fw-test.Click Object -> New Object -> New Firewall.For the name suggested earlier, it will be Firewall Builder: The main firewall configuration overview window should now be open.The firewall will be stored in an fwbuilder.Create new project file ( File -> Save as.).Run fwbuilder $ fwbuilder and create a new project. Start by flushing all existing rules (if there are any): All the rules below should be applied in VM2 unless it is said otherwise. However, you can use the iptables tool (man iptables) to manage its rules. The native firewall software in Linux is part of the kernel. Table 1: Initial Configuration (from Virtual Networking and Traffic Analysis lab) on the left, and Target Configuration for this firewall lab on the right. Please revise the previous lab assignments for instructions on how to obtain the initial configuration (left box of the table), taking into account whether you are using rnl-virt or VirtualBox. You should apdapt to your adapter names accordingly. Do not forget to change the default gateway to be 192.168.2.254. Attach Adapter 1 to the subnet 192.168.2.0/24 and set VM4's IP address as 192.168.2.4 on that adapter's configuration.Attach Adapter 3 to the subnet 192.168.2.0/24 and set VM2's IP address as 192.168.2.254 on that adapter's configuration.Add a new Adapter 3 (enp0s9) to VM2 and attach it to a new Internal Network sw-3 (or change it if you already had a 3rd adapter on VM2).Based on the previous laboratory assignments of Virtual Networking and Traffic Analysis, Initial configuration below on the left, the goal is to perform the necessary configuration changes to obtain the Target configuration on the right. Table 1 below shows the network topology configuration for this laboratory assignment.
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