Technical data

Managing TCP/IP Services

1.4 Conﬁguring a TCP/IP Cluster

host. For more information about conﬁguring a speciﬁc service for cluster failover,

refer to the chapter in this manual that discusses the particular service.

1.4.1 Setting Up an ARP-Based Cluster

Compaq strongly recommends using the conﬁguration procedure TCPIP$CONFIG

to conﬁgure a TCP/IP cluster. If you cannot run TCPIP$CONFIG, conﬁgure a

TCP/IP cluster by completing the following steps:

1. Create the interfaces for all cluster members.

2. Interactively specify an ARP-based cluster alias (for example, ALLOFUS).

Enter:

TCPIP> SET INTERFACE QE0 /CLUSTER=ALLOFUS /C_NETWORK=255.255.0.0 -

_TCPIP> /C_BROADCAST=128.44.55.0

3. Make these settings permanent in the conﬁguration database. Enter:

TCPIP> SET CONFIGURATION INTERFACE QE0 /CLUSTER=ALLOFUS -

_TCPIP> /C_NETWORK=255.255.0.0 /C_BROADCAST=128.44.55.0

The interface changes take effect the next time the product starts up.

4. Add the cluster host name or the cluster IP address to the database of

the host. Enter the same information you use with the SET INTERFACE

command.

5. Change the interface parameters (speciﬁed with the SET INTERFACE

command) only after deleting and re-creating an interface.

6. Set the cluster timer with the SET COMMUNICATION or SET

CONFIGURATION COMMUNICATION command. For example, enter:

TCPIP> SET COMMUNICATION /CLUSTER_TIMER=30

7. Optionally, direct trafﬁc to a speciﬁc host by entering the following command:

TCPIP> SET COMMUNICATION /CLUSTER_TIMER=0

The host owns the cluster alias as long as there are active TCP connections

using the alias until you either bring down the system or delete the network

interface.

1.5 Auxiliary Server

The auxiliary server is the TCP/IP Services implementation of the UNIX internet

daemon (

inetd

). In addition to standard

inetd

functions, the auxiliary server

provides access control and event logging.

The auxiliary server listens continuously for incoming requests and acts as a

master server for programs speciﬁed in its conﬁguration ﬁle. The auxiliary server

reduces the load on the system by invoking services only as they are needed.

1.5.1 How the Auxiliary Server Works

The auxiliary server listens for connections on the internet addresses of the

services that its conﬁguration ﬁle (TCPIP$SERVICES.DAT) speciﬁes. When a

connection is found, it invokes the server daemon for the service requested. Once

a server is ﬁnished, the auxiliary server continues to listen on the socket.

Managing TCP/IP Services 1–7