Wireshark: In this lab, you will use the tool Wireshark from your Kali to capture network traffic from the Kali system to metasploitable. You need to verify the ip address of both machines and test with ping. Receive notifications of new posts by email.Transcribed image text: Systems: Two systems, Kali & Metasploitable, are needed for this lab running in “NAT Network' mode as Virtualbox VMs. At the end of the header, the router also appends a GRE header with a Protocol Type (PT) of 0, and no other payload”, How GRE Keepalives Work: Wireshark GRE Keepalive “When you enable keepalives on the tunnel endpoint of Router A, the router at every interval constructs the inner IP header.

If configured, keepalives are sent from both sides. Note that Wireshark displays the tunneled source/destination IP addresses (which is great!): Wireshark GRE Tunnel

You’ll find pings, traceroute and an SSH connection. (Not to be confused with TCP/UDP port numbers.) In my capture, I am using legacy IP tunnel endpoints while IPv6 and IPv4 were tunneled. It is a layer 4 protocol with protocol number 47. In its basic usage, it is tunneling IP in IP. ) Wireshark Telnet Packet List Wireshark Telnet Follow TCP Stream Generic Routing Encapsulation (GRE)Ī tunneling protocol that is known from Cisco but used by other vendors as well such as Palo Alto Networks NGFW. Follow TCP Stream and you can see everything, including the login password. Not because I’m using it, but because it’s still alive. In my case, it gets a /56 one: Wireshark DHCPv6 Prefix Delegation Telnet Router to router conversation via DHCPv6-PD in which the downstream router asks for a prefix. (Due to RFC 4861, the min should be 0.33*max.) Wireshark RA with RDNSS and DNSSL DHCPv6 Prefix Delegation Also, note the delta time (red marked box, a custom column in Wireshark) as it varies randomly between 19-60 seconds since I manually configured those min and max values.

Router advertisements with the recursive DNS server option and the DNS search list option (of course, along with the default prefix information). IPv6 Router Advertisement (RA) with RDNSS and DNSSL

Wireshark packet capture tellnet