Services
Service lifecycle
How do you connect to a service? (Part 2)
- The service you are using has a port number.
- See /etc/services.
# Network services, Internet style
#
# Note that it is presently the policy of IANA to assign a single well-known
# port number for both TCP and UDP; hence, officially ports have two entries
# even if the protocol doesn't support UDP operations.
#
# Updated from http://www.iana.org/assignments/port-numbers and other
# sources like http://www.freebsd.org/cgi/cvsweb.cgi/src/etc/services .
# New ports will be added on request if they have been officially assigned
# by IANA and used in the real-world or are needed by a debian package.
# If you need a huge list of used numbers please install the nmap package.
...
ssh 22/tcp # SSH Remote Login Protocol
ssh 22/udp
...
http 80/tcp www # WorldWideWeb HTTP
http 80/udp # HyperText Transfer Protocol
https 443/tcp # http protocol over TLS/SSL
https 443/udp
...
imaps 993/tcp # IMAP over SSL
imaps 993/udp
...
nfs 2049/tcp # Network File System
nfs 2049/udp # Network File System
...
postgresql 5432/tcp postgres # PostgreSQL Database
postgresql 5432/udp postgres
...
# Local services
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