Saturday, January 25

Important Port Numbers for Linux Admins

                                                        

  • A port number is part of the addressing information used to identify the senders and receivers of messages. Port numbers are most commonly used with TCP/IP connections.
  •   Port numbers range is 0 to 65535, means total port numbers are 65536, The port number field is 16-bit size.So we get only 2^16(2 to the power of 16) ports , its equal to 65536 ports
  •  Default ports are 0 to 1023 (2^10=1024 ports), default ports means particular well known services such as ftp server, web server, mail server, dns server, samba server nfs server etc.., these servers are using default port numbers(dns=53, ftp=21, Apache=80, samba=139)
Note : You can see all Port Numbers in Linux /etc/services file
                # vim /etc/services

Important Port Numbers : 


    
PORT
NAME
COMMENT
1
tcpmux
TCP Port Service multiplexer

7
echo
Echo service
20
FTP Data
File Transfer Protocol - For transferring FTP data
21
FTP Control
For starting FTP connection
22
SSH
Secure Shell
23
Telnet
For insecure remote administration
25
SMTP
Send Mail Transfer Protocol
43
WHOIS service

53
DNS
Domain Name System
67
Bootp
Bootstrap Protocol(DHCP-client to server communication)
68
DHCP
Dynamic Host Configuration Protocol(Server to client communication)
69
TFTP
Trivial file transfer protocol uses udp protocol for connection less transmission of data
80
HTTP/WWW
Hypertext Transfer Protocol/apache
88
Kerberos
Kerberos is a computer network authentication protocol which works on the basis of 'tickets' to allow nodes communicating
110
POP3
Post Office Protocol - Mail delivery Agent
111
Rpcbind
part of the portmap package
123
NTP
Network time protocol used for time syncing uses UDP protocol
137
NetBIOS(nmbd)

139
SMB-Samba(smbd)
SAMBA Server
143
IMAP
Internet Message Access Protocol
161
SNMP
Simple Network Management Protocol - For network monitoring
389
LDAP
Lightweight Directory Access Protocol - For centralized administration
443
HTTPS
HTTP+SSL for secure web access
514
Syslogd

636
ldaps
LDAP over SSL - both tcp and udp
873
Rsync
Remote sync
989
FTPS-data

990
FTPS
Also known as FTP-ES, FTP-SSL and FTP Secure
993
IMAPS
IMAP Secure
995
POP3s
POP over SSL
1194
openVPN
virtual private network
1812
RADIUS
Remote Authentication Dial In User Service
2049
NFS
Network File System
2401
CVS server
Concurrent Versioning System
3128
Squid Proxy

3306
MySql
Mysql Database
3690
SVN
Apache Subversion
8008
http-alt
Hypertext Tranfer Protocol (HTTP) alternate

8080
Webcache
World Wide Web(WWW) caching service
10000
Webmin

6000 -6063
X11
X11 use 6000 to 6063.. ports for connecting X11 from remote server










 



1 comment:

  1. Compare the incentives of different casinos 우리카지노 or sites, and choose the on line casino based on the benefits or freebies that are be} the most effective for you. The wagering requirements can take the fun out of taking part in} slots with free spins. But there are still free spins bonuses that can be be} value your while. When you play slots, have the ability to|you probably can}'t become a multi-millionaire with just zero.01. In slots, like in video poker, the upper the wager — the extra have the ability to|you probably can} win.

    ReplyDelete

:: Linux - Legends ::