> WEM Port and Hardware Information
> This chapter provides information on various ports and their corresponding port numbers used by the WEM, and hardware sizing requirements of the WEM application.
> Web Element Manager Network Considerations
> To ensure proper installation and operation of the WEM, the following network considerations must be implemented:

> • | The WEM server and the ST-Series Multimedia Core Platform must be located on the same network.

> • | The Network Address Translation (NAT) protocol should not be used between the system and WEM server.

> • | If there is a firewall installed between the WEM server and the system, then the port used by the WEM to access the system must be opened. Refer to the Default TCPUDP Port Utilization section for additional information.

> • | The WEM server must be able to send and receive Ping and ICMP packets from the system.

> • | Configured application user account on WEM server.

> Default TCP/UDP Port Utilization
> Various TCP/UDP ports are used by the WEM for both client-server communication and communication with managed systems. If firewalls are used on these interfaces, these ports need to be opened. The following table lists the ports for which firewall must allow access for a port on that communication path.
> Default TCP/UDP/ICMP Port Utilization with firewall

> Port Number | Communication Type | Usage
> TCP Port:
> 20 to 21 | WEM Server to STxxSTxx to WEM ServerWEM Server to NMS | Used by FTP server to transfer Bulkstats and in case of software upgrade, Config-backup, Config-update scheduler.
> 22 | WEM Server to STxxSTxx to WEM ServerWEM Server to NMS | Used by SSH or SFTP server for Config-backup, expect scripts.
> 80 | WEM Client to WEM Server (Unsecured) | Used by Apache server for downloading the WEM applet and property files. This port is configurable.
> 443 | WEM Client to WEM Server (Secured) | Used by Apache server for downloading the WEM applet and property files under secured connection. This port is configurable.
> 14131 to 14132 | WEM Server to STxx | Used for CORBA communication. These ports are configurable.
> 15000 to 15001 | WEM Client to WEM ServerSTxx to WEM Server | Used for WEM client - server communication. WEM server receives requests on these ports from client. The STxx also sends notifications to the WEM server. The base port is configurable.
> 15015 | NMS to WEM Server | Used by NorthBound server to receive requests on this port from NMS (3GPP standard CORBA NorthBound Interface).
> 15017 | WEM Server to NMS | Used by CORBA Notification service for sending notifications to NMS (3GPP standard CORBA NorthBound Interface).
> 40000 to 40010 | WEM Server to WEM Client | Used for WEM server - client communication. The notifications such as alarms, config changes, monitor protocol, real-time graphs are done by WEM server to WEM client.
> UDP Port:
> 69 | STxx to WEM Server | Used by TFTP server. If the WEM server machine has the STxx image/config and if they are to be loaded using TFTP, then this port will be used.
> 162 | STxx to WEM Server | Default port on which WEM receives SNMP traps from STxx. This port is configurable.
> 514 | STxx to WEM Server | Used by Syslog server. WEM server machine may be configured to act as a syslog server for the STxx logs.
> ICMP Port:
> - | WEM Server to STxx | WEM server to STxx keep-alive

> The following table lists the ports used by WEM for which there is no need for any firewall to open that port.
> Default TCP/UDP/ICMP Port Utilization

> Port Number | Usage
> TCP Port:
> 5432 | Used by PostgreSQL server for accepting SQL queries from various WEM processes.
> 22222 | Used by WEM Server as "identity" port and is configurable.
> 22223 | Used by Bulkstat Server (XML generator) as "identity" port and is configurable.
> 22224 | Used by Bulkstat Parser as "identity" port and is configurable.
> 22225 | Used by Script Server as "identity" port and is configurable.

> WEM Server Hardware Sizing and Provisioning Guidelines
> In addition to the minimum system requirements provided in the previous section, the following guidelines offer information that can help you plan hardware sizing needs, based on the exact deployment scenario that you will be using.
> The information provided in this section is based on a typical installation that has the following characteristics:

> • | The WEM server application can manage up to 25 systems.

> Important: The WEM cannot manage CDMA2000 and GPRS-configured systems at the same time. Should both service types be installed in your network, you will need to purchase and run two separate WEM application instances. In this case, the same physical server hardware may be used to host both instances. Each instance, however, must be placed in a different logical partition on the hard disk and use different management LAN interfaces.

> • | No more than 30 clients will be accessing the WEM server simultaneously.

> • | The WEM application and the server it resides on are used to:

> • | Receive, process, correlate, and store SNMPv1 traps sent from the managed system. This operation involves the use of the event database, controlled by the PostgreSQL database engine, and any e-mail notifications configured for each alarm.

> • | Receive, process, and store Bulk Statistics information received from the managed system. This operation involves the use of the bulkstats database, controlled by the PostgreSQL database engine.

> • | Receive, display, and graph real-time Performance information for any number of statistical counters and polling periods.

> • | Administer WEM and CLI management users. This includes the addition, modification, and deletion of WEM-based management users, stored in the users database, controlled by the PostgreSQL database engine.

> • | Store, retrieve, and perform various configuration management operations on the managed system. This includes the storage and transfer (via FTP) of binary software images, configuration text files, and session license and feature use keys.

> • | Hard Drive Partition Recommendations:

> • | The WEM should not be installed in the root (/) partition.

> • | Root partition (/) should be at least 1 gigabyte (GB).

> • | The /usr partition should be at least 1 GB.

> • | The /var partition should be at least 8 GB.

> • | The swap partitions (/tmp, /var/run) should be at least 10 GB.

> • | The partition on which the WEM is installed should have at least 20 GB free disk space to allow for longer-term storage of bulk statistics files and other archived databases.

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