How to change ports?

ZAMO · 03-30-2007, 11:22 AM

Hai ,

I am new to linux. Shall any one tell me how to know what are the ports available for connection in my system. I know there is netstat, but i dont know how to use it.
Further how can i change the port??? for example if want to change the port from 25 to 25025, and 3389 to 62000.I have no idea on those.
Will you suggest some fine documents regarding ports checking and changing.

Thanks in advance.

Gethyn · 03-30-2007, 11:58 AM

What do you want to use the ports for? By default, all ports will be closed, unless there is some kind of service running on them. Changing the port for a specific service depends on the configuration of that service. For example, if you want to run sshd on a different port, you need to modify /etc/ssh/sshd_config.

win32sux · 03-30-2007, 04:40 PM

are you asking how to change your ephemeral port range??

if so, the way to do it is with the /proc/sys/net/ipv4/ip_local_port_range file... here's what mine looks like, for example:

Code:

win32sux@candystore:~$ cat /proc/sys/net/ipv4/ip_local_port_range
32768   61000

to change it just echo the new range into the file, like:

Code:

echo "3389 62000" > /proc/sys/net/ipv4/ip_local_port_range

or make the appropriate adjustment to your /etc/sysctl.conf file...