Manual Lancom 1823 VoIP (page 14 of 122) (English)

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LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP

 Chapter 1: Introduction

The physical connection no longer exists directly between two participants;

instead, the participants rely on their connection to the Internet. The access

technology used is not relevant in this case: Broadband technology such as

DSL (Digital Subscriber Line) is ideal. A conventional ISDN line can be used,

too.

The technologies of the individual participants do not have to be compatible

to one another, as would be the case for conventional direct connections. A

single Internet access can be used to establish multiple simultaneous logical

connections to a variety of remote stations.

The resulting savings and high flexibility makes the Internet (or any other IP

network) an outstanding backbone for a corporate network.

1.3 Firewall

The integrated stateful-inspection firewall is an effective barrier to unwanted

data traffic as it only permits the entry of data as a response to outgoing data

traffic. The IP masquerading function in the router conceals LAN workstations

accessing the Internet behind a single public IP address. The true identities (IP

addresses) of the individual workstations remain masked. Router firewall fil-

ters allow the blocking of individual IP addresses, protocols and ports. MAC

address filters also offer effective control over the access of LAN workstations

to the IP routing functions in the device.

Further important features in the firewall are:

 Intrusion detection

Attempts to break in to the local network or central firewall are recog-

nized, repelled and recorded by the Intrusion Detection System (IDS) in the

LANCOM. There is a choice of alarms including in-device logging, e-mail

messaging, SNMP traps or SYSLOG alarms.

Firewall

Internet

LAN

LANCOM

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Lancom 1823 VoIP Manual

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