Con fi gu re fi re wall fil ters
You can only con fi gu re fil ters in the »Pro fes sio nal Con fi gu ra tor«.
User-de fi ned fil ters for the rou ter in te gra ted into the PABX sys tem with pa cket fil ter fi re walls can be con fi gu red un -
der Net work / Fil ters.
Note
We re com mend con fi gu ring the fi re wall fil ters with the aid of the Fil ter Wi zard to en su re con fi gu ra ti on(s) ap pro -
pria te for and com pa ti ble to the ap pli ca tions being used. The se fil ters pro vi de pro tec ti on against data pa ckets from
the In ter net that may re sult in you being char ged for cer tain con nec tions. The functi on for the “Au to ma tic con nec -
ti on se tup”, for ex am ple, may ot her wi se not al ways be en su red. A port scan from the In ter net (usu al ly the in iti al sta -
ge of a hack at tack) may so me ti mes oc cur; the te le pho ne sys tem fi re wall then re plies to this scan with »Re ject pa -
ckets«. But this may ne ver the less re sult in data traf fic that pre vents au to ma tic se tup of a con nec ti on.
Note
The fil ters avai la ble using the Fil ter Wi zard have been im ple men ted using the la test knowled ge. We can, ho we ver,
pro vi de no gua ran tee for the functi on of the fil ters. Use of a fi re wall should go hand in hand with use of vi rus scan -
ning soft wa re on all your PCs! Fi re walls and vi rus scan ners co ver dif fe rent are as of data se cu ri ty and are an ideal
com pli ment to one anot her, but can not re pla ce one anot her.
To con fi gu re self-de fi ned fil ters click the but ton “New ...” or chan ge an exi sting en try in the fil ter list by dou ble cli -
cking on that item. An ex pla na ti on of the fil ter functi on is gi ven when you click on “Help”.
Ba sic in for ma ti on about fi re wall con fi gu ra ti on
It is im por tant that you have de tai led knowled ge about the IP pro to col fa mi ly be fo re you be gin con fi gu ring the fi re -
wall. If your knowled ge about this is not so in-depth we re com mend using a fil ter wi zard.
The fi re wall functions like a chain of ru les
through which each IP pa cket is rou ted. If a rule
ap plies to a pa cket the ac ti on as so cia ted with this
rule will be exe cu ted (al low, deny or exe cu te port -
map). All ru les are gi ven in the list un der Net -
work / Fil ters. Plea se note that for cer tain con fi -
gu ra tions the or der of the fil ters can be of great
sig ni fi can ce for the functio ning of the fi re wall.
The re fo re, af ter you mark a fil ter rule you can de -
fi ne the or der of the ru les in the tab le using the
but tons [up] and [down].
If no rule ap plies to the IP pa cket a su per-or di na te, ba sic rule at the end of the chain de ci des on the ac ti on to be ta ken
(be ha vi or by last fil ter rule).
This is why you must de fi ne the be ha vi or.. .. .. for this su per-or di na te rule at the be gin ning of the fil ter con fi gu ra ti on.
You can choo se bet ween »Al low« or »Dis card« for this.
Con fi gu re fi re wall fil ters
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