128 LANC - LAN configuration

The AMO LANC can be used to administer the WAML board’s board-specific configuration data that is required for LAN communication via the ISDN network or with the Atlantic LAN to the ADP. In addition to its administration function, the AMO LANC also serves to read out the WAML board’s MAC addresses and initiate loading of the data to the board. In a system maximally 4 WAML boards can be configured.

The following tables are processed:

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Global parameter table
This table contains all the characteristics and limiting values that are generally valid for each WAML board. The number of B-channels in the WAML circuit is administered by means of AMO TDCSU!

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Network interface table
This table defines the 4 network interfaces on the WAML board. One entry is provided for each interface. The network mask defines the network connected to the interface. The interface is identified by means of its defined name (see NETNAME parameter).

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IP routing table
This table contains routing information for the packet’s destination IP address. The entry determines the next router to be required in the network. Entries can apply to an entire network or to individual hosts. The table is arranged by IP address and can hold up to 200 different entries.
With the help of an entry with the “wild card address” 0.0.0.0 the WAML board can route all IP addresses not contained in its IP routing table to a default router. See 128.2.1, “ADD-LANC”.

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ISDN remote terminal table
This table assigns possible station numbers and characteristics to the destination IP address of an ISDN remote terminal (WAML) in the network. The usage must be specified for a station number. Also note that the station number for which the ’OUT’ value was specified in the INOUTCHx parameter is always used as the station number for callback. The table is arranged by IP address and can hold up to 200 different entries.

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Firewall IP address table
This table contains the IP addresses of hosts connected to external servers and their network access rights. On the basis of the rights entered, a check is run for each packet to determine whether the source IP address and destination IP address are allowed to communicate. The table is arranged by IP address and can hold up to 305 different entries.

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Firewall MAC address table
This table contains the assignment of MAC addresses to IP addresses for hosts connected to external servers. It can be used to check the assignment of source IP addresses to MAC addresses only for packets received from the external LAN. The table is arranged by IP address and can hold up to 100 different entries. If routers are inserted between the WAML2 and the external server, as source MAC address the MAC address of the last router has to be added into the Firewall MAC Address Table.
The MAC address is an internationally unique hardware address of the Ethernet interface that is permanently encoded on every LAN board at the time of production. The verb DISPLAY can be used to determine the MAC addresses of any WAML.

When basic initialization is performed for the tables, the WAML board is not operational.

The criteria that determine whether data transmission is performed include a packet’s source IP address and destination IP address and, in the case of ISDN access, the station number. The firewall function on the WAML board is a protective mechanism that prevents the transmission of packets from unauthorized stations. To do so, it uses the entries in the firewall IP address table, firewall MAC address table and ISDN remote terminal table. The firewall checks and WAML network interfaces are activated in the global parameter table.

Only one LAN interface on the external LAN can be operated at one time. The relevant LAN hardware interface is selected in the global parameter table.

The WAML supports 2 routing methods regarding the Atlantic LAN which can be set in the global parameter table. By default, the Atlantic LAN interface doesn’t need to be configured. In case of access to ADP via external LAN, the ADP can be reached with the IP address of the external LAN interface; in case of access to ADP via ISDN, the ADP can be reached with the IP address of the ISDN interface.

The AMO LANC is not able to check whether tables that are added are consistent with the topology of an existing network (e.g. IP addresses).

If more than one WAML board is configured in a system, the following items must be considered:

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the Atlantic LAN interface can be added to only one WAML

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the IP addresses of the network interfaces EXTLAN1, ISDN1 und ISDN2 must be unique

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the WAML station number (parameter STNO) must be different for each WAML

In scope of feature IPDA (IP Distributed Architecture) the WAML boards can be configured in the Access Points which have the LTU range from 17 to 99 (added by AMO UCSU and BCSU). The Source Group Index (SRCGRP) assigned to the LTU is issued in the header mask at command DISP-LANC.

Further details and other WAML specific configuration examples see Feature Usage Example LAN Connectivity.

OpenScape 4000 V10, Volume 1: AMO Descriptions, Service Documentation, Issue 5, ID: P31003H31A0S107057620

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