Fedora Linux

;; QUESTION SECTION:
;224.93.183.216.in-addr.arpa. IN PTR
;; ANSWER SECTION:
224.93.183.216.in-addr.arpa. 38204 IN PTR global.proximity.on.ca.
;; AUTHORITY SECTION:
93.183.216.in-addr.arpa. 38204 IN NS ns1.scratchtelecom.com.
;; ADDITIONAL SECTION:
ns1.scratchtelecom.com. 172567 IN A 216.183.93.250
;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sun Mar 5 00:21:39 2006
;; MSG SIZE rcvd: 133

The host or nslookup commands will automatically convert an IP address into this type of query:

$ host 216.183.93.224
224.93.183.216.in-addr.arpa domain name pointer global.proximity.on.ca.
$ nslookup 216.183.93.224
Server: 127.0.0.1
Address: 127.0.0.1#53
Non-authoritative answer:
224.93.183.216.in-addr.arpa name = global.proximity.on.ca.
Authoritative answers can be found from:
93.183.216.in-addr.arpa nameserver = ns1.scratchtelecom.com.
ns1.scratchtelecom.com internet address = 216.183.93.250

The Fedora graphical configuration tool for DNS is called system-config-bind .

7.3.3. What About...

7.3.3.1. ...changing from one nameserver to another?

Be sure that you never leave an obsolete nameserver active. For example, if your name service was provided by an ISP and you take over the name service, ensure that the ISP's nameserver no longer contain entries for your domain; otherwise, customers of that ISP may not be able to reach your system because they will receive obsolete DNS information.

7.3.4. Where Can I Learn More?

? The manpages for named and named_selinux ; dig , nslookup , and host ; nsswitch.conf , hosts , and resolv.conf

? The BIND 9 Administrator's Reference Manual in PDF format (/usr/share/doc/bind-9.3.2/arm/Bv9ARM.pdf) or HTML format (file:///usr/share/doc/bind-9.3.1/arm/Bv9ARM.html)

7.4. Configuring a CUPS Print Server

The Common Unix Printing System (CUPS) printer daemon can also be used as a print server, enabling other computers on the local network to access the printers it controls.

7.4.1. How Do I Do That?

Start the Printer Configuration tool shown in Figure 7-14 . Highlight the printer you wish to share, select the checkbox labeled Shared, and then click Apply.

Figure 7-14. Printer configuration: sharing properties

Next, click on Server Settings on the lefthand side and select the checkbox labeled 'Share published printers connected to this system.' Click Apply.

You will need to open the IPP port 631 (ipp:tcp) in your firewall configuration (see Lab 8.1, 'Prevent Unwanted Connections').

Your printer will now be accessible to other systems.

7.4.1.1. Accessing a CUPS printer from Windows XP

To add a CUPS printer to a Windows XP system, select 'Printers and Faxes' from the Start menu and click on 'Add a printer.' The Add Printer Wizard will appear.

Click Next to advance past the introduction. On the next page, select 'A network printer, or a printer attached to another computer,' and click Next. The window shown in Figure 7-15 will appear.

Figure 7-15. Adding a CUPS printer to a Windows XP system