Olaf Kirch: Linux Network Administrator Guide, Second Edition

DBM is a simple database management library that uses hashing techniques to speed up search operations. There's a free DBM implementation from the GNU project called gdbm, which is part of most Linux distributions.

To enable use of the /etc/hosts.allow method, you may have to recompile the server. Please read the instructions in the README included in the distribution.

The secure portmapper is available via anonymous FTP from ftp.win.tue.nl below the /pub/security/ directory.

Rick can be reached at jrs@world.std.com.

Actually, you can omit the -t nfs argument because mount sees from the colon that this specifies an NFS volume.

One doesn't say filesystem because these are not proper filesystems.

Novell and NetWare are trademarks of the Novell Corporation.

Alan can be reached at alan@lxorguk.ukuu.org.uk.

Greg can be reached at gpage@sovereign.org.

Volker can be reached at lendecke@namu01.gwdg.de.

Ales can be reached at A.Dryak@sh.cvut.cz. Martin can be reached at mstover@freeway.de.

Information on Caldera can be found at http://www.caldera.com/.

It looks like the system administrators had been sampling some of the Virtual Brewery's wares before they chose some of those print queue names. Hopefully your print queue names are more meaningful!

Written and copyrighted by Ian Taylor, 1995.

It's also included in the 4.4BSD System Manager's Manual.

If you're just going to try out UUCP, get the number of an archive site near you. Write down the login and password - they're public to make anonymous downloads possible. In most cases, they're something like uucp/uucp or nuucp/uucp.

The only limitation is that it shouldn't be longer than seven characters, so as to not confuse UUCP implementations that run on an operating system that imposes a narrow limit on filenames. Names that are longer than seven characters are often truncated by UUCP. Some versions even limit the name to six characters.

The UUCP Mapping Project registers all UUCP hostnames worldwide and makes sure they are unique.

Older Version 2 UUCPs don't broadcast their name when being called; however, newer implementations often do, and so does Taylor UUCP.

For instance, most companies' private installations require you to dial a 0 or 9 to get a line to the outside.

The bit rate of the tty must be at least as high as the maximum transfer speed.

If the remote system runs Taylor UUCP, it will obey.

Some modems don't seem to like this and occasionally hang.

bsmtp is used to deliver mail with batched SMTP.

You may use a tilde (~) character to refer to the UUCP public directory, but only in UUCP configuration files; outside it usually translates to the user's home directory.

Note that tcpd usually has mode 700, so that you must invoke it as user root, not uucp. tcpd is discussed in more detail in Chapter 12, Important Network Features.

Gert Doering's mgetty is such a beast. It runs on a variety of platforms, including SCO Unix, AIX, SunOS, HP-UX, and Linux.

This option is not present in Version 1.04.

That is, files with names beginning with a dot. Such files aren't normally displayed by the ls command.

Read RFC-1437 if you don't believe this statement!

Guylhem can be reached at guylhem@danmark.linux.eu.org.

It is customary to append a signature or .sig to a mail message, usually containing information on the author along with a joke or a motto. It is offset from the mail message by a line containing " - " followed by a space.

This is because disk space is usually allocated in blocks of 1,024 bytes. So even a message of a few dozen bytes will eat a full kilobyte.

When trying to reach a DECnet address from an RFC-822 environment, you can use "host::user"@relay, for which relay is the name of a known Internet-DECnet relay.

Maps for sites registered with the UUCP Mapping Project are distributed through the newsgroup comp.mail.maps; other organizations may publish separate maps for their networks.

They are posted regularly in news.lists.ps-maps. Beware. They're HUGE.

The Free On-Line Dictionary of Computing can be found packaged in many Linux distributions, or online at its home page at http://wombat.doc.ic.ac.uk/foldoc/.

Other possible locations are /etc/rc.d/init.d and rc.inet2. The latter is common on systems using a BSD-style structure for system administration files in the /etc directory.

This is the new standard location of sendmail according to the Linux File System Standard. Another common location is /usr/lib/sendmail, which is likely to be used by mail programs that are not specially configured for Linux. You can define both filenames as symbolic links to Exim so that programs and scripts invoking sendmail will instead invoke Exim to do the same things.

Some user agents, however, use the SMTP protocol to pass messages to the transport agent, calling it with the -bs option.

Use kill HUP pid, for which pid is the process ID of the inetd process retrieved from a ps listing.

The system load is a standard Unix measure of the average number of processes that are queued up, waiting to run. The uptime shows load averages taken over the previous 1, 5, and 15 minutes.

This is a simplification. It is possible for directors to pass addresses to transports that deliver to remote hosts, and similarly, it is possible for routers to pass addresses to local transports that write the messsage to a file or a pipe. It is also possible for routers to pass addresses to the directors in some circumstances.

A director is skipped if the address it is about to process is one that it has previously processed in the course of generating the present address.

Please, if you choose to use a vacation program, make sure it will not reply to messages sent from mailing lists! It is very annoying to discover that someone has gone on vacation and find a vacation message for every message they've received. Mailing list administrators: this is a good example of why it is bad practice to force the Reply-To: field of mailing list messages to that of the list submission address.

The format of Usenet news messages is specified in RFC-1036, "Standard for interchange of USENET messages."

Wait a minute: 60 Megs at 9,600 bps, that's 60 million multiplied by 1,024, that is… mutter, mutter… Hey! That's 34 hours!