Can you create a port knocking system only with iptable commands that will open up port 22 (SSH) when the remote host “knocks” on ports 2222, 3333, 4444 within 30 seconds?
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Can you create a port knocking system only with iptable commands that will open up port 22 (SSH) when the remote host “knocks” on ports 2222, 3333, 4444 within 30 seconds?
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- The following program sets up a single client/server connection. When the client connects, the server reads any incoming data as text and prints it out one line at a time. If the server receives the string “shutdown”, then it closes the socket and exits. Download this program Download this program into GCC and run the code. Then update your code to allow for the server to manage concurrent connections on the same port. Use IP address 127.0.0.1. Page of 3 ZOOM /* Server code */ #define BUF_SIZE 1024 #define LISTEN_PORT 8080 int main(int argc, char *argv[]) { int sock_listen, sock_recv; int i, addr_size, bytes_received; int incoming_len; int recv_msg_size; struct sockaddr_in my_addr, recv_addr; int select_ret; fd_set readfds; struct timeval timeout={0,0}; struct sockaddr remote_addr; char buf[BUF_SIZE]; /* create socket for listening */ sock_listen = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if (sock_listen < 0) { printf("socket() failed\n"); exit(0); } /* make local address…When a client wishes to establish a connection to an object that is reachable only via a firewall, it must open a TCP connection to the appropriate SOCKS port on the SOCKS server system. Even if the client wishes to send UDP segments, first a TCP connection is opened. Moreover, UDP segments can be forwarded only as long as the TCP connection remains opened. Why?When executing the Test-NetConnection CommonTCPPort" parameter, which of the following common TCP ports are included? Choose four answers. !!! SMB SMTP HTTP RDP WinRM DNS Submit cmdlet with the "- 4
- The connection oriented datagram socket uses UDP. True FalseAn instance of ServerSocket listens for TCP connection requests and creates a new Socket instance to handle each incoming connection. Select one: True FalseTo create a tcp IPv6 client socket, the below given tuple format address is to be used. Choose the correct format. Question 29 options: IPV6ADDRESS = (host, port) IPV6_ADDRESS = (host; port) IP_ADDRESS : (host, port) IPV_ADDRESS = (host: port) IPV6_ADDRESS = (host, port)
- I have a server code: import socket # Define the server address and port server_address = ('localhost', 12345) # Create a TCP socket server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # Bind the socket to the server address server_sock.bind(server_address) # Listen for incoming connections server_sock.listen(1) while True: print('Waiting for a connection...') # Accept a client connection client_sock, client_address = server_sock.accept() print('Connected to:', client_address) try: # Receive data from the client data = client_sock.recv(1024) # Process the received data processed_data = data.swapcase() # Send the processed data back to the client client_sock.sendall(processed_data) finally: # Close the client socket client_sock.close() print('Connection closed.') break # Close the server socket server_sock.close() And the Client code: import…Active sockets: Use the command netstat /? to explore the parameters that can be used with it. Then use netstat –n -a to display all current sockets (all connections and listening port). Choose one of the established connections and supply the following information: The server side normally has well-known port number, below 1024. What is the established protocol or service for the server port number you found above? (Search in Google for “port number list” or “well-known port numbers”)Step2: open Wireshark in the Windows machine and set a filter "tcp". Use hping3 command in Kali Linux to send two packets to the windows machine like the following: - packet nature : tcp - number of packets : 2 - destination port: 110 - Flag SYN active - interval time 100 microseconds write the command here and give a screenshot from Kali and Wireshark capture of those two packets from wireshark can you tell what correspond to tcp destination port 100 ? Step 3: set Wireshark filter now to "udp" to see only udp packets Send two packets to the windows machine like the following: - packet nature : udp - number of packets : 4 - destination port : 67 - interval time 100 microseconds write the command here and give a screenshot from Kali and Wireshark capture of those packets from wireshark can you tell what correspond to udp destination port = 67 ? and what its hexadecimal representation
- Write a script to find and print your local IP address Use the following code: import socket hostname = socket.gethostname() local_ip = socket.gethostbyname(hostname) print(local_ip)Complete the following Windows PowerShell cmdlet to test TCP connectivity with secure HTTP. Test-NetConnection –ComputerName PLABDM01 –Port ___An administrator is trying to enable the interface of a router. To accomplish this task, the administrator is using the command "No shutdown". In which of the following configuration modes, the command "No shutdown" can be entered? a. Router(config-line)# O b. Router(config)# O. Router(config-if)# O d. Router#