Lesson 5

Dates: 2/20/2019
Linux networking
Linux System Administration


TCP and UDP ports
  • Protocols TCP and UDP act as port managers for user applications.
  • Some ports listed in /etc/services: 
      
systat          11/tcp          users
daytime         13/tcp
daytime         13/udp
netstat         15/tcp
qotd            17/tcp          quote
msp             18/tcp         # message send protocol
msp             18/udp
chargen         19/tcp          ttytst source
chargen         19/udp          ttytst source
ftp-data        20/tcp
ftp             21/tcp
fsp             21/udp          fspd
ssh             22/tcp         # SSH Remote Login Protocol
ssh             22/udp
telnet          23/tcp
smtp            25/tcp          mail
  • Ports under 1024 are privileged ports.
  • Socket = Port + IP address.
    Any new connection opens a new socket.


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