For at se alle åbne porte i linux bruges en kommando som hedder netstat.
netstat kan rigtig mange ting.
$ netstat -tulpn –statistics
IcmpMsg:
InType0: 2
InType3: 32032
InType8: 31145
InType11: 694
InType13: 11
OutType0: 31145
OutType3: 68998
OutType14: 11
Tcp:
980530 active connections openings
199881 passive connection openings
1171 failed connection attempts
1558 connection resets received
6 connections established
1591750919 segments received
1301290369 segments send out
413205 segments retransmited
43035 bad segments received.
904786 resets sent
InCsumErrors: 43017
Udp:
30403306 packets received
71680 packets to unknown port received.
168 packet receive errors
30403996 packets sent
InCsumErrors: 168
osv osv. Denne kommando kan give et meget langt svar.
-t– Viser TCP porte.-u– Viser UDP porte.-l– Viser socket.-n– Viser port nr.-p– Viser process/program navn.
For at se TCP- og UDP-porte i realtid kan du dog køre netstat- eller ss-værktøjet med watch som vist her.
$ sudo watch netstat -tulpn
Eller
$ sudo watch ss -tulpn
Du stopper dem med CTRL+C