Technical data

4. Packages
TRANSPROXY_ALLOW_N
TRANSPROXY_ALLOW_x List of nets and/or IP addresses for which the packet filter has
to be opened. It should cover the nets that should be redirected by the packet filter. If
you don’t set any ranges here they have to be entered manually in the configuration of
the packet filter.
4.17.5. OPT_SIPPROXY (EXPERIMENTELL) - Proxy for Session Initiation
Protocol
If SIP tools (Ekiga, x-lite or Hardware SIP-Phones) have to be used behind a router it may
be needed that network ports are redirected for connections to work properly.
To avoid this a special SIP Proxy-Server can be used. At the time of writing (fli4l V4.0.0)
several such Proxys are being evaluated. If someone can suggest a good choice please inform
us!
4.17.6. OPT_IGMPPROXY - Internet Group Management Protocol Proxy)
The German Telekom AG offers VDSL25/50 for some years now (Bandwidth: 25/50 MBit/s)
in so-called Entertain packages. This enables to watch TV over the Internet (IPTV).
IPTV is provided via Multicast, from one source to a (closed) group. The network protocol
needed to organize Multicast groups is called IGMP (Internet Group Management Protocol).
IGMP (http://en.wikipedia.org/wiki/IGMP) provides the ability to dynamically manage Mul-
ticast groups. The administration is not done in the transmitting station but by the routers
to which recipients of a multicast group are connected directly. IGMP provides functions by
which a station notifies a router that it wants to receive multicast IP packets of a particular
multicast group.
The provided Speedport routers (W700V/W701V/W722 by the time of writing) support
IGMP. Those who want to use fli4l for IPTV instead of those Speedport routers, need an IGMP-
Proxy (http://sourceforge.net/projects/igmpproxy/) on the fli4l. OPT_IGMPPROXY is a
IGMP-Proxy for fli4l.
This documentation for the package OPT_IGMP describes the configuration of fli4l to use
VDSL and IPTV with the supplied set-top box (STB) X300T/X301T or MR-303 behind a fli4l
router. In this description, the installation of IPTV via an additional network card is assumed.
Precondition
The German Telekom introduced VDSL as a VLAN. In the introductory phase only one VLAN
tag (ID7) was used for all traffic. After that they switched to two VLAN tags (ID7, ID8). The
Internet traffic remains on ID7 and the new ID8 is used exclusively for IPTV multicast traffic.
The conversion of VDSL (two VLAN tags ID7/ID8) is largely completed by the current state.
Hardware (besides Set-Top-Boxes and VDSL-Modem):
• Hardware for fli4l: For VDSL 25/50 more than an i486. In case of sound or image
distortions it may be that the hardware used has too little power.
• High-End network interface cards (Examples: 3Com, Intel Pro100). Realtek chipsets are
not recommended.
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