Tools for network connectivity checks

mtr This command should help us determining any TCP packet loss seen on any hops in the path

mtr -n -T -c 200 <destination ip address/host>

hping3 is a network tool able to send custom TCP/IP packets and to display target replies like ping program does with ICMP replies

hping3 -S -c 50 -V <Public IP of instance/host> -p <destination port>```

nc is a command-line utility that reads and writes data across network connections, using the TCP or UDP protocols

nc [options] host port

traceroute Do bidirectional trace routes from sending and receiving servers

traceroute host

ping Use ping or ping6 for ICMP

ping host

TRICKS

• Trick to find server/software version

echo "EXIT" | nc host port

• Transfer file if ssl is corrupted

On receiving server/host(receiving.server.com) send the output to file file_name

nc -l port > file_name

On sending server/host ,redirect the `file_name`

nc receiving.server.com 5555 < file_name