#!/bin/sh

export DATE="9.3.2010";SCRIPT=${0#/rom}
export TITLE="Skype
Info Page"
. ${SCRIPT%/*}/cgi-bin-pre.sh

cat<<EOF
<H1>Skype
Info Page</H1>
<P> This gateway automatically
blocks filesharing (P2P) programs. There is a filesharing program named &quot;Skype&quot;
which can also be used for Internet telephony (VoIP). The undamped
operation of Skype therefore will trigger the file sharing block.
Moreover, Skype tries to prevent the computer/network administrator from
managing it's communication by various technical cheats (e.g. it changes
the firewall settings of your PC without permission). Especially the &quot;Supernode
detection&quot; leads to a communication behaviour not distinguishable
from a filesharing program. </P>
<P>
Additionally, Skype will put a high load on the radio
network with it's communication and may therefore affect other users.
Morveover, many Skype users do not realize that they hand over their PC
and Internet connection to the Skype company. Even if there is no current
voice connection, the Skype company may select your PC to route voice
connections between other users.</P>
<H2>Measures</H2>
<P>For
optimal Skype operation, you should ask the operator of this Internet
gateway for access to a Socks-5 proxy direct on the gateway. Unfortunately
the Skype program ignores the proxy settings it it's option menu. However,
since version 3 you can limit Skype by implementing Windows administrative
policy rules meant to optimize settings in company networks. With this,
the communication behaviour of Skype can be adapted for use in the radio
network.</P>
<P>For
this, follow these steps:</P>
<OL>
<LI>Download
one of the following registry files:
<DL>
<DT><A HREF="cgi-bin-skype-noproxy.reg">Version
without Socks-5 proxy</A></DT>
<DD>These
settings should work in any case.</DD>
<DT><A HREF="cgi-bin-skype-proxy.reg">Version
with Socks-5-Proxy on this gateway</A></DT>
<DD>These
settings only work in the Freifunk network if the gateway owner
enables you to use his socks 5 proxy. The proxy prevents
disconnections and optimizes the voice connection.</DD>
</DL></LI>
<LI> Log in as
administrator on your PC (not necessary if you normally can install
programs without entering an administrator password).</LI>
<LI> Import the registry file with a
double click on the file.</LI>
<LI> Restart
the PC.</LI>
</OL>
<P><B>Note
for MAC Users:</B> Unfortunately, the &quot;Socks 4/5 Proxy&quot; setting
in the Skype options is virtually without effect. MAC users may enforce an
application based firewall rule to prevent Skype from sending out UDP
packets. Skype then use only TCP, which is less aggressive. Possibly, the
Skype Windows version can be operated under Parallels.</P>
<P><B>Note
for Linux Users:</B> With Linux, unfortunately no application-based
firewall exists and the &quot;Socks 4/5 Proxy&quot; setting in the Skype
options is also without effect. Here, the &quot;apparmor&quot; program
helps, which is for example installed by default under Ubuntu. Copy the
<A HREF="usr.bin.skype">usr.bin.skype</A> file to /etc/apparmor.d/ and
execute: &quot;sudo aa-enforce skype&quot;. This prevents Skype from using
UDP, and from accessing your Mozilla settings or the /etc/password file.
Alternatively, you can operate the Skype Windows version under VMWare
(VirtualBox does not work).</P>
EOF

. ${SCRIPT%/*}/cgi-bin-post.sh