Network Tools¶
There are many tools that can be used to debug networks. Here are some of them:
ping¶
ping is a tool to check if a host is reachable. It sends ICMP packets to the host and waits for a response. If the host is reachable, it will respond with an ICMP packet. If the host is not reachable, it will not respond.
ping <host>
traceroute¶
traceroute is a tool to check the route to a host. It prints all the hops between you and the target.
traceroute <host>
nmap¶
nmap is a tool to scan a host for open ports. It can also be used to scan a whole network for open ports. Its a very powerful tool, which will also be used for hacking.
You can find the download here.
nmap <host> # scan a host
nmap -sS <host> # scan a host with TCP SYN scan
namp -Pn <host> # scan a host without ping
netcat¶
netcat is a tool to send and receive data over TCP and UDP. It can be used to debug network connections.
nc -l <port> # listen on a port
nc <host> <port> # connect to a host on a port
nslookup¶
nslookup is a tool to query DNS servers. It can be used to debug DNS.
nslookup <host> # query the DNS server for a host
nslookup <host> <dns-server> # query a specific DNS server for a host