UDP Ping is really useful especially to see if SNMP is running. The syntax for UDP checking commands is a bit obscure so we’ve listed a few variants. Our favourite is
nc also knows as
nmap-ncat. Here is the command syntax to test if an UDP port is listening with
nc. Be sure to use the
v verbose switch to get the full story.
nc -zvu serverxyz.abc.com 161 Connection to serverxyz.abc.host 161 port [udp/snmp] succeeded!
Or try this (not working version – see 0 bytes received):
[[email protected]1 ~]# nc -zvu 127.0.0.1 161 Ncat: Version 7.50 ( https://nmap.org/ncat ) Ncat: Connected to 127.0.0.1:161. Ncat: UDP packet sent successfully Ncat: 1 bytes sent, 0 bytes received in 2.01 seconds.
And here are some alternate methods:
sudo nmap -sU -p port target nping –udp -p port target hping3 -S –udp -p port target