Changes to TCP/IP

The user interface to TCP/IP is virtually the same, but the administration of NIS+ maps is handled through the Administration Tool, which is different from the process in SunOS release 4.x and traditional AT&T SVR4.

The NIS+ maps administered by the Administration Tool include:

• Hosts
• Services
• RPC
• Ethers

When you are ready to use SunOS release 5.4 TCP/IP facilities, see TCP/IP Network Administration Guide for complete information.

Changes to NFS

The Solaris 2.4 operating environment simplifies resource sharing with a new set of commands and files to administer NFS resources. This set of commands is called distributed file system (DFS) administration; it replaces the NFS commands that SunOS release 4.x uses.

PPP

PPP for Solaris 2.4 systems is an asynchronous implementation of the standard data link-level, point-to-point protocol (PPP) included in the internet protocol suite. PPP enables a network administrator to create a communications link using modems and telephone lines. See TCP/IP Network Administration Guide for detailed information.

UUCP

The Solaris 2.4 UNIX-to-UNIX Copy (UUCP) is similar to the HoneyDanBer UUCP available with SunOS release 4.x systems. It uses the same set of configuration files, scripts, and commands, so you should be able to restore most changes you made in SunOS release 4.x files and scripts to run with this release. However, the spool directory is organized differently in Solaris 2.4 due to job grades, a mechanism to help sort and prioritize the work load.

Table 13-1 describes the new files and commands offered with Solaris 2.4 UUCP that were not part of the SunOS release 4.x implementation. Table 13-2 on page 137 describes the log files added to Solaris 2.4 UUCP.

Table 13-1

Command or File	Description
D. data files P. data files	These data files are created when a UUCP command line specifies copying the source file to a spool directory. All data files have this format: systmxxxxyyy. systm is the first five characters in the name of the remote system. xxxx is a four-digit job sequence number assigned by UUCP. yyy is a subsequence number used to distinguish between several D. files created for a work (C.) file.
/etc/uucp/Grades	Maps text grade names to system names.
/etc/uucp/Limits	Specifies the number of concurrent UUCP sessions that can occur. Replaces Maxuuscheds and Maxuuxqts files in previous versions.
/etc/uucp/Config	Contains information to override UUCP parameters that can be tuned. Currently, the only parameter of this type is Protocol, so system administrators normally will not have to modify this file.
uuglist	Prints the list of service grades available on the system to use with the -g option of uucp(1C) and uux(1C).

Solaris 2.4 UUCP includes a few additional features that can affect system administration.

• Checkpoint-restart facilities
• Job grades that control UUCP transmission
• Two new configuration files to limit the number of concurrent UUCP sessions that the system can run, and to override UUCP parameters that can be tuned

The following sections describe the system administration differences made by each of these additions.

Checkpoint Restart

When communication link failures interrupt UUCP transmissions between SunOS release 4.x systems, the transmission starts again from the beginning of the file as soon as communication resumes. Communication between two systems running Solaris 2.4 UUCP resumes where it was interrupted, instead of restarting at the beginning. This makes better throughput possible, especially on erratic or noisy transmission lines.

The systems use two new files to store sent and received data and to compare the sizes of the files to determine where to restart transmission. The systems use.P files to store received data and.D files to store transmitted data. These files replace the TM. files of previous UUCP versions. If only one system is running SunOS release 5.4 UUCP, no comparison can take place and transmissions restarts from the beginning.

User Job Grades

Job grading lets administrators divide jobs into work loads that compete against others of similar size, type, priority, or all three. You can sort work loads using any one, or a combination of these factors. You can also set access permissions allowing users and groups to obtain each grade of UUCP service.

In SunOS release 4.x, the user has to choose the grade when the job is submitted. Grades are a single letter, not a name, as they are in the Solaris 2.4 operating environment. Solaris 2.4 systems enable administrators to define job grades for an entire site.

Limits File

The /etc/uucp/Limits file specifies the maximum number of concurrent uucico, uuxqt, and uusched processes permitted on a system. This single file replaces the Maxuusched and Maxuuxqt parameters on previous releases.

Config File

The /etc/uucp/Config file contains information to override UUCP parameters that can be tuned. Currently the only parameter available is Protocol and should normally not be altered by system administrators.

Log Files

Solaris 2.4 UUCP provides four log files in addition to the four supplied in previous versions. These files record accounting, command, performance, and security information. The command and security log files are created if they do not exist. The accounting and performance log files are written only if they already exist.

Table 13-2

File Name	Function
/var/uucp/.Admin/account	Records account information for billing
/var/uucp/.Admin/perflog	Records statistics on uucico operations
/var/uucp/.Admin/security	Records attempted security violations
/var/uucp/.Admin/command	Records information on commands issued by users or administrators

When you are ready to set up and use SunOS release 5.4 UUCP, see TCP/IP Network Administration Guide for complete information.