breaking up services documentation into documentation files related to service groups

docs/services/utility.md

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+# Utility Services
+
+* Table of Contents
+{:toc}
+
+# Overview
+
+Variety of convenience services for carrying out common networking changes.
+
+The following services are provided as utilities:
+* UCARP
+* IP Forward
+* Default Routing
+* Default Muticast Routing
+* Static Routing
+* SSH
+* DHCP
+* DHCP Client
+* FTP
+* HTTP
+* PCAP
+* RADVD
+* ATD
+
+## Installation
+
+To install the functionality of the previously metioned services you can run the following command:
+```shell
+sudo apt-get install isc-dhcp-server apache2 libpcap-dev radvd at
+```
+
+## UCARP
+
+UCARP allows a couple of hosts to share common virtual IP addresses in order to provide automatic failover. It is a portable userland implementation of the secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD's alternative to the patents-bloated VRRP).
+
+Strong points of the CARP protocol are: very low overhead, cryptographically signed messages, interoperability between different operating systems and no need for any dedicated extra network link between redundant hosts.
+
+### Installation
+
+```shell
+sudo apt-get install ucarp
+```