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Openbsd

Red Hat Linux (RHEL) 5/6: Change OpenSSH Port Number

I am a new Red Hat Enterprise Linux server sysadmin. How do I change default sshd tcp port # 22 to 3033 on RHEL v5/6? How do I modify SELinux to allow port 3033 and how do I saftly update firewall on RHEL to allow tcp port # 3033? How do I change ssh port on Redhat Linux operating system?
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Sysadmin because even developers need heroes!!!

OpenBSD: Configure Network Interface As A Bridge / Network Switch

I have Soekris single board communication embedded computers which is optimized for low power and network usage. The server has four Ethernet ports. How do I setup IPv4 software bridge using OpenBSD operating systems so that the rest of four ports act as a network switch?
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CentOS Linux: Start / Stop / Restart SSHD Command

I‘m a new CentOS Linux server user. How can I start, stop, or restart the OpenSSH (SSHD) server on a CentOS Linux? How can I start SSHD on boot time on a CentOS Linux?
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OpenBSD: Boot / Install Using PXE (Preboot Execution Environment)

How do I boot and Install OpenBSD operating system using Preboot Execution Environment (PXE)? Do I need to use an existing OpenBSD host to install OpenBSD using PXE?
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OpenBSD / FreeBSD / NetBSD: PF Firewall List Rules

I can use iptables -L -n command with Linux operating system to list the current firewall rules. How do I list all the current firewall rules under OpenBSD / FreeBSD / NetBSD operating systems? How can I see all pf firewall rules using command line tool?
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OpnBSD PPTP Client: Install and Create a VPN

I work form home, and I need to login into our corporate network (Microsoft based PPTP server) using a pptp based vpn. How do I configure and setup up a PPTP VPN client under OpenBSD desktop / laptop or router / server operating systems?
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OpenBSD: Configure Ralink USB IEEE 802.11a/g/n Wireless Network Adapter

I brought a USB 2.0 wireless adapters based on the Ralink RT2700U, RT2800U and RT3000U chipsets. How do I configure and use it under OpenBSD operating systems?
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OpenBSD: HowTO Install Sets After Installation

How do I install a package set after install under OpenBSD operating systems? I forgot to add a file set comp52.tgz package. How do I install the same after installing the operating system?
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Linux / Unix ssh-keygen: Create A Host Key File

How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
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Ubuntu / Debian Linux Server Install Keychain SSH Key Manager For OpenSSH

I do not want to start ssh-agent and ssh-add as described here to manage my ssh keys for password less login. How do I install keychain software to manage my keys running on a Debian or Ubuntu based cloud server?
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