Axis 2400+ Manuale Utente Scaricare il pdf (Pagina 42)

DHCP servers

It takes time to administer the IP addresses for

large numbers of devices on a network. To reduce

this administration time and keep the number of IP

addresses to a minimum, you can use a device called

a DHCP server. This type of server automatically issues

network devices with IP addresses when they connect

to the network.

Domain Name Servers

In larger networks a Domain Name Server (DNS) is

included. This is literally a ‘name’ server; it associates

and remembers given names to corresponding IP

addresses. For example, a network camera monitoring

a door is more easily remembered and accessed

by the word ‘door’ than it is by its IP address, e.g.

192.36.253.80.

Firewalls

All networks connecting to the Internet should be

protected against hackers. An Internet ‘ﬁ rewall’ is a

device that ensures that only authorized users can

access devices connected to the LAN.

In larger networks it is common to use a PC to

perform the combined functions of a NAT, DHCP server

and ﬁ rewall. This PC may also be used as an e-mail

server, name server, and image storage.

Internet connection with Web space

Obtain an Internet connection that includes space on

a Web server. The cameras can then be programmed to

continuously update images on the Web server.

Internet connection with remote modem

Install a modem in the ofﬁ ce. This makes it possible to

access the company network from home via a modem.

This is a common solution, used by many people

working from home.

Internet connection

with VPN or SSH software

Obtain an Internet connection that includes a single

public IP address and install software VPN (Virtual

Private Network) or SSH (Secure Shell) software on a

gateway computer. Although this is a safe way to access

the company network over the Internet, you will need

a good knowledge about networks to implement and

maintain it.

Internet connection with ﬁ rewall and NAT

Obtain an Internet connection with one public IP address

and conﬁ gure the ﬁ rewall/NAT so that different port

numbers are ‘mapped’ (assigned) to the respective IP

addresses of the cameras; for example, www.name.com:

8080 will access the LAN IP address 10.112.46.14. You

will also need a good knowledge about networks to

implement and maintain this solution.

Internet connection

with continuous camera upload

Obtain an Internet connection with a single public IP

address. Add a Web server and program the cameras to

continuously update this Web server. You will also need

a good knowledge about networks to implement and

maintain this solution.

N ETWORK BASICS

An example of a typical ofﬁ ce using a PC as the gateway to the Internet. The PC functions as a router with two IP addresses: one relevant to the internal network,

the other one for its use over the Internet.

SCANNER

CAMERAS

PRINTER

MODEM

PCPC PC PC

A PC WORKING AS GATEWAY:

- ROUTER

- EMAIL SERVER

- NAME SERVER, DNS

- FIREWALL

CONNECTION TO A PHONE

COMPANY OR INTERNET PROVIDER

- NAT

- DHCP

SWITCH

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Axis 2400+ Manuale Utente Pagina 42

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