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  option ntp-servers 192.168.1.1;
}
Depending on the size of your network, a local NTP server may or may not make 
sense, but at the very least, NTP should be installed on every Linux workstation and 
server to ensure proper time synchronization. In most cases, the workstation version 
of Ubuntu will already be configured to
 synchronize to the Ubuntu time servers, 
but when it comes to the server version, NTP isn't typically installed for you.
Summary
In this chapter, we explored additional networking topics. We started off with some 
notes on planning an IP address scheme for your network so that you could create 
groups for the different types of nodes, such as servers and network equipment, and 
plan a pool of addresses for DHCP. We also worked through the process of setting 
up a DHCP and DNS server, which gives us additional flexibility when configuring 
the services we run on our network, such as when defining a custom IP scheme 
for DHCP, as well as giving us the ability to resolve the hostnames of devices on 
our network by name. We closed off this chapter with discussions on setting up an 
internet gateway to serve as our internet-facing router, as well as configuring an 
NTP server for ensuring that the clocks of our servers are synchronized.

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Setting Up Network Services