Manual AVM ISDN MultiProtocol Router for Windows 2000 ADSL (page 53 of 134) (English)

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Incoming Calls

NT/MPRI – 3 Configuration and Operation of the NT/MPRI: The Basics 52

With IP masquerading, one “official” IP address is sufficient for all

communication between a private LAN and the public Internet. The

NT/MPRI processes the IP addresses in the TCP, UDP and ICMP packets

such that only one IP address is visible to the Internet. Hosts in a pri-

vate LAN thus can continue using their internal (“unofficial”) IP ad-

dresses for communication with the Internet. A system shielded in this

manner is significantly more difficult to break through than a packet-fil-

ter firewall.

The NT/MPRI automatically updates its internal IP address translation

table upon outgoing TCP and UDP connections. Dynamically generated

port or ICMP sequence numbers are used to map the private LAN host

unambiguously. FTP also is supported fully with IP masquerading.

IP masquerading is activated in the IP settings of a call destination

(“IP” button).

Although classical IP masquerading only permits outbound TCP con-

nections from the local network, the NT/MPRI can extend masquerad-

ing, if desired, so that incoming TCP, UDP and ICMP connections are

forwarded to certain hosts in the LAN. For this the NT/MPRI uses “Mas-

querading Profiles”, fixed rules for bidirectional mapping of external IP

address/port combinations to internal IP addresses and ports. If the

port is specified as “0”, then static Network Address Translation (NAT)

is performed in accordance with RFC 1631.

Masquerading Profiles are configured at “Configuration / Security / IP

Masquerading/NAT”. In the IP settings of a call destination, click the

“IP” button to select a configured profile.

In this way the NT/MPRI can forward incoming E-mail (SMTP) to speci-

fied hosts in a private LAN.

Incoming Calls

The NT/MPRI only accepts calls from “known” remote sites, i.e., those

sites for which call destination settings have been configured.

The NT/MPRI assigns an incoming call to a local call destination based

on one of the following methods:

l The CLI number (CLIP=Calling Line Identification Presentation)

Prerequisite for this method is that the caller’s number is trans-

mitted over the D-channel. This service must be requested from

and enabled by your ISDN provider. In addition, a call destination

must be associated with this CLI number. This is ensured either by

ntmpri-e.book Seite 52 Donnerstag, 28. Februar 2002 11:26 11

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AVM ISDN MultiProtocol Router for Windows 2000 ADSL Manual

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