Technical data

4. Packages
If fli4l is simply used as an internet gateway only one circuit is needed. Exception: fli4l’s
least-cost features should be used. In this case define different circuits for all allowed timespans,
see below.
ISDN_CIRC_N Sets the number of used ISDN circuits. If fli4l is used only to monitor in-
coming ISDN calls set:
ISDN_CIRC_N='0'
If fli4l is simply used as an internet gateway one circuit is enough. Exception: LC-routing,
see below.
ISDN_CIRC_x_NAME Set a name for the circuit - maximum length is 15 characters. The
imon client imonc.exe will show this instead of the telephone number dialed. Possi-
ble characters are ’A’ to ’Z’ (Capitals are possible), number ’0’ to ’9’ and hyphens ’-’.
Example:
ISDN_CIRC_x_NAME='msn'
This name can be used in the packet filter or with OpenVPN. If for example the packet
filter should control an ISDN circuit a ’circuit_’ has to prefix the circuit name. If an
ISDN circuit is called ’willi’ the packet filter has to be set like this:
PF_INPUT_3='if:circuit_willi:any prot:udp 192.168.200.226 192.168.200.254:53 ACCEPT'
ISDN_CIRC_x_USEPEERDNS This determines wether the name servers transferred by the
internet provider during dial-in should be filled in the configuration file of the local
name server for the duration of the connection. This only makes sense for circuits used
for connecting to an internet provider. Nearly all providers support this name server
tansfer.
After name server IP addresses have been transferred name servers entries from base.txt’s
DNS_FORWARDERS are removed from the configuration file of the local name server and the
transferred ones are filled in as forwarders. After this the name server is forced to relaod
is configuration. The name server cache will be preserved and names already resolved
are kept.
This option has the advantage to work with the nearest possible name servers at any
time, as far as the provider transmits correct IP addresses - name resolution is faster
then.
In case of failing DNS servers at the provider side transmitted DNS server addresses
usually are corrected rapidly by the provider.
After all it is absolutely necessary for the first dial-in to provide a valid name server in
base.txt’s DNS_FORWARDERS. Otherwise the first request can not be resolved correctly. In
addition the initial configuration of the name server will be restored on hangup.
Default setting: ISDN_CIRC_x_USEPEERDNS=’yes’
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