Technical data

4. Packages
PF6_PREROUTING_N This variable contains the number of IPv6 firewall rules for forward-
ing to a different destination (PREROUTING chain). For a more detailed description
see the documentation of variable PF_PREROUTING_N.
Example: PF6_PREROUTING_N='2'
PF6_PREROUTING_x PF6_PREROUTING_x_COMMENT
A list of rules to set the IPv6 packets that should be forwarded by the router to an-
other destination. For a more detailed description see the documentation of variable
PF_PREROUTING_x.
4.12.4. Web-GUI
The package installs a menu entry “Packet Filter (IPv6)” in Mini-HTTPD to review entries of
the packet filter configured for IPv6 .
4.13. ISDN - Communication Over Active And Passive ISDN-Cards
fli4l is mainly aiming to be used as an ISDN- and/or DSL-router. By setting OPT_ISDN=’yes’
the ISDN package is activated. Precondition is a ISDN-card supported by fli4l.
Default setting: OPT_ISDN=’no’
4.13.1. Establishing An ISDN Connection
fli4l’s behaviour during dial-in is determined by three variables DIALMODE, ISDN_CIRC_X_ROUTE_X,
ISDN_CIRC_X_TIMES. DIALMODE (Page 72) (in config /base.txt) determines wether a connection
will be automatically established on an active circuit on packet arrival or not. DIALMODE may
have the following values:
auto If a packet reaches an ISDN-circuit (res. the ISDN interface derived from it - ippp*)
a connection will be established automatically. If and when a packet reaches an ISDN-
circuit is determined by ISDN_CIRC_X_ROUTE_X and ISDN_CIRC_X_TIMES.
manual In manual mode the connection has to established via imond/imonc. How this is done
see imonc/imond.
off No ISDN connections will be established.
Which circuits packets will trigger a dial-in is defined by ISDN_CIRC_X_ROUTE_X. Normally
this uses ’0.0.0.0/0’ as the ’default route’. This means that all packets that leave the local net
are using this circuit if it is active. If and when it is active is determined by ISDN_CIRC_X_-
TIMES for fli4l is doing least cost routing over a predefinded circuit (see Least-Cost-Routing -
Functionality (Page 265) in the base documentation). If not all but only packets for a certain
net should be routed over this circuit (i.e. a company net) additional nets can be given here.
fli4l will then set a permanently active ISDN route over the interface set for this circuit. If a
packet is sent to this net a connection will be automatically established.
As said before ISDN_CIRC_X_TIMES besides the connection costs for a circuit describes also
if and when a circuit with a default route is active and can trigger a connection. ’When’ is
defined by the time-info, the first two elements (i.e. Mo-Fr:09-18), ’if’ is given by the forth
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