So we recommend you to use ettercap on the gateways ONLY with the UNOFFENSIVE MODE ENABLED. This is an invasive behaviour on gateways. This is done to prevent a forward of a packet twice (one by ettercap and one by the kernel). The kernel ip_forwarding is always disabled by ettercap. So you can use a mitm attack launched from a different tool and let ettercap modify the packets and forward them for you. The packet not directed to the host running ettercap will be forwarded automatically using layer 3 routing. You can choose to put or not the interface in promisc mode (-p option). UNIFIED, this method sniffs all the packets that pass on the cable. It supports active and passive dissection of many protocols (even ciphered ones) and includes many features for network and host analysis (such as OS fingerprint). 192.168.0.1-30,40,50/20,22,25) DescriptionĮttercap was born as a sniffer for switched LAN (and obviously even "hubbed" ones), but during the development process it has gained more and more features that have changed it to a powerful and flexible tool for man-in-the-middle attacks. Even the target specification has been changed. Since ettercap NG (formerly 0.7.0), all the options have been changed. Multipurpose sniffer/content filter for man in the middle attacks ***** Important Note ******
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