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Technical Support - User Guides

User Guides are our way of advising schools about any changes they may need to carry out and instructions as to how to make those changes.

Ref: SB - LAN
Title: LAN Address Usage
Created: 22/5/12   Modified: 22/5/12

LAN Address Usage

Each establishment is provided with a routable address range from within the aggregation point’s address space, which provides a number of usable addresses. The first 21 addresses are reserved for specific services hosted within the establishment. Access lists on the local CPE and perimeter firewalls are configured with this address usage in mind, therefore it is essential that the scheme below is followed.

(x = Area ID, y= first octet, z = last octet)

10.x.y.0 Network Address
10.x.y.1 Router
10.x.y.2 Reserved
10.x.y.3 Reserved
10.x.y.4 Reserved for Espresso Content Server (If required)
10.x.y.5 Reserved for Websense ISA Server (If required)
10.x.y.6 Reserved
10.x.y.7 Reserved
10.x.y.8 Reserved
10.x.y.9 Reserved
10.x.y.10 Reserved
10.x.y.11 Reserved
10.x.y.12 Reserved
10.x.y.13 Reserved
10.x.y.14 Reserved
10.x.y.15 Reserved
10.x.y.16 Reserved for VC Unit (if required)
10.x.y.17 Reserved for VC Unit (if required)
10.x.y.18 Reserved
10.x.y.19 Reserved
10.x.y.20 Reserved for mail server (If Required)
10.x.y.21 MIS Database Server
10.x.z.253 Reserved
10.x.z.254 Reserved

As each establishment’s needs differ there is no definitive guide to how the rest of the available address space should be utilized. we recommend the usage below, as this gives room for expansion, whilst maintaining available addresses.

10.x.y.22 to 10.x.y.40 – Other servers
10.x.y.41 to 10.x.y.99 – Misc static devices, Switches etc
10.x.y.100 to 10.x.z.200 – DHCP scope

Devices such as Printers do not require access to the WAN, nor do they need to be accessible from other parts of the WAN. Therefore we recommend that these devices are placed on another private network ( for example). An address in this range can then be bound to the print server as a secondary address to allow printing from LAN clients to the printers network via the printer server.<