≡ Menu

netstat command

Clear Squid Proxy Cache And Re-create the Cache Directories

How do I clear squid cache? How do I re-create the cache directories on a server where Squid version 3.x is currently running in Linux or Unix based server?
[click to continue…]

Linux: Find Out What Is Using TCP Port 80

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?
[click to continue…]

FreeBSD PPTP Client: Install and Create a VPN

I work form home, and I need to login into our corporate network using a pptp based vpn. How do I configure and setup up a PPTP VPN client under FreeBSD desktop / laptop or server operating systems?
[click to continue…]

Linux Network Statistics Tools / Commands

How do I find out the current network interface throughput statistics on Linux (CentOS or Debian based distro)? How do I see current kernel snmp counters and network interface statistics on Linux operating systems?
[click to continue…]

Debian Linux Install OpenSSH SSHD Server

How do I install OpenSSH sshd server under Debian GNU/Linux operating systems?
[click to continue…]

RHEL 6: Change OpenSSH Port To 1255 ( SELinux Config )

I've edited /etc/ssh/sshd_config to change the port number:

Port 1255

However, I'm getting an error as follows:

sshd[26792]: error: Bind to port 1255 on failed: Permission denied

How do I change default OpenSSH port number from 22 to 1255 under RedHat Enterprise Linux server version 6 and SELinux?
[click to continue…]

Linux: Check Network Connection Command

How do I check network connections under Linux using command line options?
[click to continue…]

Linux Find Out My IP Number ( IP Address )

How do I find out ip number (IP Address) of my Linux server using command line options?
[click to continue…]

Linux: Find Out Which Process Is Listening Upon a Port

How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?
[click to continue…]

ping command: TTL Expired In Transit Error and Solution

When I try to ping other UNIX / Linux / BSD or MS-Windows servers in our network I get the following message:

TTL Expired In Transit

How do I fix this problem?
[click to continue…]