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explicit need to receive images in this manner. In addition to the inherent

security issues, the methods required to perform these steps will vary from

device to device so you will need a good understanding of the mechanics of

the router that you are using.

C.5 Network Address Translation

In addition to any ﬁrewall capabilities, most residential and small business

routers make use of a scheme called network address translation (NAT for

short). This system allows a network composed of many devices to connect

to the internet using only a single IP Address - all of the devices share this

address and the router handles the routing of traﬃc to the appropriate device.

In addition to providing a useful service, this system also inherently acts as

a ﬁrewall of sorts as any unexpected traﬃc cannot be routed and will be

discarded. As such, in order to access the server over the internet you will

also have to perform a number of additional steps to tell the device how to

route the FTP traﬃc to the appropriate computer.

C.6 Setting up your Router

If you would like to access ITP over the internet, you need to conﬁgure your

router to allow FTP traﬃc and route it to the appropriate location. This

procedure is generally a relatively simple process as long as you know the de-

tails that you need to enter - however there are unfortunately a large number

of diﬀerent routers on the market and each has its own way of handling this

task. This section will outline the basic process used to perform this action

to give you an idea of the procedure - however it is advised that you check

the manual that came with your device to get speciﬁc instructions on how

to open a port. This procedure is generally referred to port forwarding or

virtual servers and the vast majority of modern routers do have extensive

support for this capability.

Note that opening up the FTP port to the internet does have security

ramiﬁcations, so it is advised that you consider them prior to performing

these steps. FTP is a common protocol and if exposed to the internet without

the use of robust passwords can be misused by unauthorized parties. If you do

need to use this system, it is advised that you disable anonymous FTP access

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Canon WFT-E1 Manuale Utente Pagina 70