Common ports for linux

laugh

I haven't a great memory and often when i need to know a port for something I have to Google or grep /etc/services to find out the reverse.

What common ports do you come across using linux, being a linux administrator or just generally working in IT?


21 FTP
22 SSH
23 telnet
25 smtp
53 DNS
80 http
110 pop3
111 rpc
123 ntp
137 -139 netbios (samba)
161 snmp
443 https
445 SMB
3306 mysql

What others would you add to your commonly used port list?

Tillotson

http://en.wikipedia.org/wiki/Port_numbers

laugh

cheers I was thinking more of a shorter list :pac:

Mathiasb

22, if your SSH server is running on the standard port (bad practice). 80, if you're running a web server..

loldog

My installation of Transmission from the Ubuntu repos uses 57093 for torrenting.

.

Naikon

Mathiasb wrote: »

22, if your SSH server is running on the standard port (bad practice). 80, if you're running a web server..

Security through obscurity is not a good practice when dealing with Unix server systems. There is no need to run services on non standard ports assuming you have a decent policy in place.
Use Kerberos everywhere, along with strong public key authentication(i.e no password logins)and bob is your uncle. Sit back and enjoy the sysadmin coffee after everything is setup nicely:pac:

matrim

laugh wrote: »

I haven't a great memory and often when i need to know a port for something I have to Google or grep /etc/services to find out the reverse.

What common ports do you come across using linux, being a linux administrator or just generally working in IT?


21 FTP
22 SSH
23 telnet
25 smtp
53 DNS
80 http
110 pop3
111 rpc
123 ntp
137 -139 netbios (samba)
161 snmp
443 https
445 SMB
3306 mysql

What others would you add to your commonly used port list?

I'd also include 8080 for alternate http, as well as 5060 \ 5061 if you are using sip \ sips

FruitLover

You've neglected to mention whether these are TCP or UDP ports.

Some I deal with regularly:

IP 50 (IPSec ESP)
UDP 500 (IKE)
UDP & TCP 88 (Kerberos)
UDP 1812 & 1813 (RADIUS)

Skrynesaver

$less /etc/services

niallb

143 IMAP
993 IMAP over SSL
465 SMTP over SSL
587 SMTP over SSL (alternative)
1194 OpenVPN