network traceroute , nmap, curl -k

traceroute not displaying:

https://askubuntu.com/questions/1113815/traceroute-is-not-showing-ips-instead-it-showing-stars

traceroute is using UDP probe packets by default - and your firewall settings are blocking them. IIRC Windows tracert uses ICMP - so you could try traceroute -I or traceroute --icmp




Internet Control Message Protocol (ICMP) is used for reporting errors and performing network diagnostics. In the error reporting process, ICMP sends messages from the receiver to the sender when data does not come though as it should.

https://serverfault.com/questions/374620/does-traceroute-use-udp-or-icmp-or-both

the type of packet that is sent differs depending on the implementation. By default Windows tracert uses ICMP and both Mac OS X and Linux traceroute use UDP.




when nmap is blocked use:

https://security.stackexchange.com/questions/124394/nmap-says-host-down-when-host-is-up

 nmap -Pn 192.168.0.171




You can use the -PA and/or -PS commands to check if a host is up or down.

For example:

nmap 192.168.0.171 -PA(port#) -PS(port#) -vv -T5

The -PA and -PS will check if a host is running a stateful or stateless firewall. The -vv is extra verbosity for more output to the terminal. The -T5 is how aggressive the scan will be. Try these out and see what your result is.

curl -k (insecure) disable cert verification

https://serverfault.com/questions/469824/curl-disable-certificate-verification

-k, --insecure

(SSL) This option explicitly allows curl to perform "insecure" SSL connections and transfers. All SSL connections are attempted to be made secure by using the CA certificate bundle installed by default. This makes all connections considered "insecure" fail unless -k, --insecure is used.

See this online resource for