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Troubleshooting Techniques and Tools

1.2 Isolating Problems

1.2.10 Determine Whether Network Services Are Available

The auxiliary server functions like the UNIX internet daemon (

inetd

)by

managing access to the network services. The auxiliary server assigns standard

port numbers to services such as the BOOTP, SMTP, or FTP servers, and starts

the appropriate image after receiving an incoming request.

To verify correct operation of a service, you need to verify that the service:

• Has an entry in the service database

• Has the correct attributes deﬁned

• Account has the correct privileges

• Is enabled

• Is started

1.2.10.1 Displaying the Service Database

To display the services database, enter the SHOW SERVICE command. For

example:

TCPIP> SHOW SERVICE

!"#$%&

Service Port Proto Process Address State

FINGER 79 TCP TCPIP$FINGER 0.0.0.0 Disabled

FTP 21 TCP TCPIP$FTP 0.0.0.0 Enabled

LPD 515 TCP TCPIP$LPD 0.0.0.0 Enabled

MOUNT 10 UDP TCPIP$NFS_M 0.0.0.0 Enabled

NFS 2049 UDP TCPIP$NFS 0.0.0.0 Enabled

NTP 123 UDP TCPIP$NTP 0.0.0.0 Enabled

PCNFS 5151 TCP,UDP TCPIP$PCNFSD 0.0.0.0 Enabled

POP 110 TCP TCPIP$POP 0.0.0.0 Enabled

PORTMAPPER 111 TCP,UDP TCPIP$PORTM 0.0.0.0 Enabled

REXEC 512 TCP TCPIP$REXEC 0.0.0.0 Enabled

RLOGIN 513 TCP not defined 0.0.0.0 Enabled

RSH 514 TCP TCPIP$RSH 0.0.0.0 Enabled

SMTP 25 TCP TCPIP$SMTP 0.0.0.0 Enabled

SNMP 161 UDP TCPIP$SNMP 0.0.0.0 Enabled

TELNET 23 TCP not defined 0.0.0.0 Enabled

TFTP 69 UDP TCPIP$TFTP 0.0.0.0 Enabled

! This column lists those services with entries in the TCPIP services database.

If not listed in this column, the service was never enabled during the

conﬁguration procedure (using TCPIP$CONFIG.COM). To enable additional

services, run the TCPIP$CONFIG procedure.

" This column lists the port on which the service listens for connection requests.

The port number is either the well-known port number for the service or an

ephemeral port number assigned when the socket is assigned a protocol

address.

# This column lists the TCP/IP protocol that the service uses to communicate

with the client process.

$ This column lists the process name for the service. If you use the DCL

command SHOW SYSTEM /NETWORK, this is the process name you should

see if the process is running.

% This column lists the IP address of the interface on which the service accepts

connection requests. IP address 0.0.0.0 indicates that the service will accept

connection requests received on any of the local interfaces.

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