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eclecticmiraclecat/check a TCP_UDP port is open using netcat

Last active June 18, 2021 19:53
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check a TCP_UDP port is open using netcat
open in firewall
On client:
# nc -vz 192.168.1.29 80
Connection to 192.168.1.29 80 port [tcp/http] succeeded!
On server:
# nc -vl 192.168.1.29 80
Connection from 192.168.1.28 port 80 [tcp/http] accepted
blocked in firewall
On client:
# nc -vz 192.168.1.29 80
On server:
# nc -vl 192.168.1.29 80
UDP
# nc -vzu 192.168.1.29 80
Connection to 192.168.1.29 80 port [udp/http] succeeded!
# nc -vlu 192.168.1.29 80
Connection from 192.168.1.28 port 80 [udp/http] accepted
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