Skype - 3.0 beta Guia do Utilizador descarregar pdf (Página 30)

Skype Network Administrator’s Guide Skype 3.0 Beta 30

2006-10-31 Document version 2.0 Beta

• Instruct your users to choose good passwords for Skype and change them regularly.

Remember, users should never check “remember my password” when using Skype on a

shared computer.

How to Determine if your Network is Skype-Friendly?

In general, most firewalls, routers, and NAT devices are Skype-friendly. Typically they are

configured to handle UDP traffic properly by default.

You can determine if your network is Skype friendly this with freeware called NAT Check,

created by Bryan Ford. NAT Check lets you test your network to determine if the UDP

traffic is handled properly; in other words, that UDP translation is compatible with a P2P

protocol such as Skype. Downloadable NAT Check from

http://midcomp2p.sourceforge.net.

Make sure that your network’s UDP translation shows consistent translation. Also be

certain that the input and output ports are identical (except in the event of a conflict

loopback translation). And, make sure that unsolicited UDP packets that get sent to the

network are filtered or discarded. Last but not least, Skype prefers that your network’s

firewall or NAT gateway supports IP packet fragmentation and reassembly. However, this

is not a hard requirement.

Skype does require, however, that your firewall not block attempts to send parallel UDP

packets or TCP connection attempts to multiple ports at the destination address. The

reason? Some firewalls mistakenly classify this as port scanning and block the host as a

result. This does not only affect Skype adversely, but also may adversely impact other

legitimate network applications running on the same host computer.

Verifying the Authenticity of the Skype Installer for Windows

To ensure that you have the most current version of Skype, download it from the Skype

Web site at www.skype.com/download.

It is possible to get Skype from third parties as well, in part because Skype Technologies

S.A. allows third parties to host downloaded versions of the client; that is, as long as the

third party in question adheres to the terms of Skype’s End User License Agreement

(EULA) regarding the redistribution of the Skype client.

Note: According to the terms of the Skype Terms of Service and EULA, third parties may

not repackage or wrap the Skype application in any other software.

Skype software installers for Microsoft Windows XP, Windows 2000, and Windows

Pocket PC 2003, as well as the Skype application itself, are digitally signed. So, to

guarantee that you have an authentic version of the Skype, and to prevent accidentally

installing any malware or spyware, you should verify the Skype software installer’s digital

signature before you install it.

You can perform the digital signature verification test on an installed Skype executable

program once the Skype installer has been run, but it is best to verify the authenticity of the

digital signature before Skype is installed and run.

Skype for Linux distributions that are packaged in rpm format are signed using Skype’s

signing key, which you can download from the Skype Web site at

www.skype.com/products/skype/linux.

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