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Skype Network Administrator’s Guide Skype 3.0 Beta 11

2006-10-31 Document version 2.0 Beta

Firewall and NAT-Device Traversal

In most situations, Skype automatically traverses the vast majority of firewall and NAT

boundaries. Therefore, many of the problems that network administrators encounter when

they attempt to deploy SIP (Session Initiation Protocol)-based Internet voice solutions are

often avoided by Skype’s innovative P2P network architecture.

Skype clients on publicly routable Internet addresses (and those that are not behind

restrictive firewalls) can provide assistance to peer nodes that are hindered by network

address translation.

The ability of peer nodes outside a firewall to assist peer nodes behind a firewall or NAT

allows Skype clients to connect, as long as they both can make an outgoing connection to

the Internet.

As a result, when a user initiates a Skype call, the connection can be made, regardless of

whether the caller or the recipient is behind a firewall or a NAT boundary.

It is true that some software firewalls interfere with Skype, however. In such cases, you

can simply reconfigure the software firewall to allow the Skype client to work.

Skype supports regular HTTP or HTTPS proxies, and authenticating HTTPS/SSL and

SOCKS5 proxies. In the Skype client, these preferences can be set through the Tools ->

Options - > Connection.

Skype Network Resource Consumption

Generally, Skype peer nodes, supernodes, and relay nodes require minimal CPU cycles.

And, with the exception of additional processing power needed for conference calls, and

bandwidth required for large file transfers, resource requirements are minimal, even for

video calls.

Bandwidth Indicator

The Skype Windows client now supports a visual bandwidth indicator, which is turned off

by default. When the bandwidth indicator is turned on, a visual display replaces the on-line

status text in the lower left-hand area of the Skype main window to provide a window into

how much bandwidth Skype is using, both for upload and for download.

Figure 1. Skype Client Bandwidth Meter

The bandwidth indicator is composed of seven colored bars, which move up and down

according to the amount of bandwidth being used.

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Skype - 3.0 beta Betriebsanweisung Seite 11