Linux system scan

Nmap

Traceroute

Netcat (NC):

1. Port scan

2. Chat Server

3. File transfer

4. Directory Transfer

5. Data encryption

EtherApe

Ifstat

Iftop

Fping:

The difference between fping and Ping is that fping can specify the number of hosts to ping on the command line, or you can specify a list file containing the hosts to ping.

Unlike ping to wait for a host connection to time out or send back feedback, Fping sends a packet to the next host immediately after sending the packet to a host, enabling multiple hosts to ping at the same time. If a host pings, the host is flagged and removed from the wait list, and if there is no ping, the host is not reachable, and the host remains in the waiting list for subsequent operations.

PS: (ping is a reply request via ICMP (Network control Information Protocol Internetcontrol message Protocol) protocol to detect the presence of the host)

Hping:

Hping is a more advanced host scan tool that supports TCP/IP packet construction, analysis, and can be used to scan a surviving host when certain firewall configurations or operators intercept ICMP packets. Hping can also forge a source IP to initiate a DDoS attack.

If the firewall or carrier masks ICMP, hping can initiate TCP probing on the specified destination port, with the usual parameters:

-P Port number

-S send TCP SYN Packets

-A sends a TCP ACK packet

-A forged source IP

--flood Send As soon as possible, with caution

Linux system scan