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Linux Server Security, Second Edition
book

Linux Server Security, Second Edition

by Michael D. Bauer
January 2005
Intermediate to advanced content levelIntermediate to advanced
544 pages
23h 44m
English
O'Reilly Media, Inc.
Content preview from Linux Server Security, Second Edition
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
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Chapter 6: Securing Domain Name Services (DNS)
The less common record types shown in Table 6-6 have no helper applications.
After making changes to a datafile, type
make. This runs the tinydns-data program to
convert data to data.cdb. The conversion will only overwrite the existing database if
the source data is consistent. tinydns will start serving the new data immediately.
Some tinydns-backed sites actually keep their zone data in databases (SQL or LDAP)
or separate files for ease of editing, and generate the tinydns datafile when needed.
Running djbdns client programs
In addition to its server daemons and support processes, djbdns includes client utili-
ties (Table 6-7). These perform the same functions as BIND’s old utilities, nslookup
and dig, and are useful for troubleshooting and testing your DNS infrastructure.
They work with any nameserver, not just tinydns.
add-alias fqdn ip +fqdn:ip:ttl:ts Specify an alias: create another A record (fqdn to ip).
add-mx fqdn ip @dom:ip:x:dist: ttl:ts Specify a mail server: create an MX record. If x contains
any dots, it is treated as a literal hostname; otherwise, it
is interpreted as
x.ns.dom. dist is distance and
defaults to
0.
Add-mx also generates sequential hostnames of
a, b,
etc. for
x.
Table 6-6. Less-common record types
Helper application ...
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Publisher Resources

ISBN: 0596006705Supplemental ContentCatalog PageErrata