The con nec ti on is re-estab lis hed ho we ver as soon as a data pa cket must be rou ted to the In ter net which the fi re wall
lets pass in ac cor dan ce with its con fi gu ra ti on.
Note
Note that when you click the but ton »Send«, the en ti re con fi gu ra ti on for the PABX sys tem will be over writ ten. It is
stron gly re com men ded to read out the con fi gu ra ti on for the PABX sys tem and sto ring it in a file pri or to chan ging
the fil ter con fi gu ra ti on.
We re com mend fol lo wing the in struc tions gi ven by the Fil ter Wi zard, un less you estab lish that one of the ap pli ca -
tions you are using can not set up a con nec ti on to the In ter net. In this case, plea se check whet her the Fil ter Wi zard has
a cor re spon ding fil ter avai la ble.
Plea se note that all fil ters that are ge ner ated with the Fil ter Wi zard are ba sed on pa ckets being dis car ded, with the ex -
cep ti on of tho se for which an ap pro pria te rule exists. The more fil ters you con fi gu re for the PABX sys tem, the more
com pu ting time is re qui red for pro ces sing of the se fil ters. This could slight ly re du ce the ma xi mum achie va ble data
throughput rate for the PABX sys tem in some cases.
You can call up in struc tions for ma nu al con fi gu ra ti on of the fi re wall fil ter ru les using the but ton »Help« in the con fi -
gu ra ti on di alog »Fil ters«.
Portmapping
You wish to ac cess your PC from an ex ter nal lo ca ti on via In ter net. Nor mal ly, ac cess via the fi re wall should be pro hi -
bi ted. When you use port map ping, ac cess to an ISDN rou ter port that you have en ab led is per mit ted from an ex ter nal
lo ca ti on. The ISDN rou ter then for wards the ac cess re quest to the de fi ned port of the PC in the net work. When the PC
re turns data pa ckets the IP ad dress and port num ber of the PC are re pla ced by the ISDN rou ter with the num ber for
the port map ping port and the rou ter IP. For “out si ders” on the In ter net it then ap pe ars as though the re is only one
con nec ti on to the ISDN rou ter.
Note
Plea se note that when you use port map ping the fi re wall for the ports en ab led for this functi on is inef fec ti ve. The
tar get PC may then be sus cep ti ble to any po ten ti al at tacks.
Port map ping is prac ti cal when you wish to run a game ser ver on your own, for ex am ple.
You can make this ser ver ac ces si ble via the In ter net to ot her users.
Or, if you re qui re cer tain peer-to-peer file sha ring soft wa re that pro vi des grea ter downlo ad band -
width.
When the cor re spon ding PC in your LAN is to be ac ces si ble from the In ter net (not pos si ble in the stan -
dard con fi gu ra ti on with NAT). In this case, cer tain UDP and TCP ports must be re rou ted to a PC in the
LAN.
Costs for Internet connections
The PABX can sto re up to 500 call data re cords. This data is not lost in the event of a loss of po wer.
The PABX sys tem also ge ner ates a call date re cord for con nec tions made by the ISDN rou ter. The call data re cords
con tain de tai led in for ma ti on about the call. For ex.: Date and time, du ra ti on of call, num ber of cal ler and of the par ty
cal led, type of con nec ti on, call costs and num ber of by tes sent and re cei ved.
Plea se note that only the net work ser vi ce pro vi der is aut ho ri zed for bin ding con nec ti on/call cost log ging.
Information about data security when surfing the Internet
You should use a vi rus scan ner on all LAN clients to pro tect your per so nal data. Use of this type of soft wa re is in dis -
pen sa ble for sa fe gu ar ding per so nal data.
Portmapping Des crip ti on of the ISDN rou ter functions
10
(36 paginas)
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