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<TITLE>Developer.com - Online Reference Library - 0672311739:RED HAT LINUX 2ND EDITION:Configuring and Building Kernels</TITLE>
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<!-- TITLE=RED HAT LINUX 2ND EDITION //-->
<!-- AUTHOR=DAVID PITTS ET AL //-->
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<A NAME="PAGENUM-63"><P>Page 63</P></A>
<P>
the compiler can optimize the kernel. To select your processor type, click the button to the
left of the option (in Figure 5.4, this button is labeled
Pentium) to generate a drop-down box with a list of processors. Click the processor type you have (or the closest one), and you're
set.
</P>
<H4><A NAME="ch05_ 11">
Floppy, IDE, and Other Block Devices
</A></H4>
<P>The Floppy, IDE, and other block devices submenu lists the options you have for basic
device support for IDE and floppies as well as some older drive types (for example, MFM and
RLL). As the kernel evolves, these options will change slightly.
</P>
<P>You definitely should select Yes for Normal floppy disk support because you will have no
way of accessing your floppy drives without it. Don't select No for this option because you're
looking for a way to secure your floppies from nonroot users; instead change the permissions on
/dev/fd0 to 0600.
</P>
<P>If you have an IDE hard drive (like the sample system does), you should select Yes for
Enhanced IDE/MFM/RLL disk/cdrom/tape support. Selecting No dims all the IDE options
in the rest of the submenu. Because you're using this option, the next option (Old harddisk
(MFM/RLL/IDE) driver) is dimmed.
</P>
<P>The remainder of the IDE options are for support for specific chipsets. This information
varies from machine to machine. When you're in doubt, selecting Yes for these options doesn't
hurt, but it will result in a larger kernel. Each driver will automatically probe the system at boot
time to determine whether it should or should not be activated.
</P>
<P>You can select Yes for Loopback device support if you have a special need to mount a file as
a filesystem (for example, for testing an ISO9660 image before burning it to a CD). You
should also select Yes for Loopback device support if you intend on using the Common
Desktop Environment. For most people, however, this option should be tagged No.
</P>
<P>The Multiple devices driver support option turns on a special
driver that allows you to connect multiple partitions (even on different disks) together to work as one large partition. Unless
you are a systems administrator configuring this item, you should set this option to No. If you
plan to set up this feature, be sure to read the
./drivers/block/README.md file in the Linux source tree. The options for using Linear (append) mode and RAID-0 (striping) mode are
applicable only if you plan to use Multiple devices driver support.
</P>
<P>RAM disk support is provided in the kernel to allow you to create virtual filesystems in
your system's memory. This feature is really useful only if you are creating a special kernel for use
on boot disks. For most instances, select No for RAM disk support. Doing so automatically
dims the Initial RAM disk (initrd) support option.
</P>
<P>Unless you have a very old hard disk that you need to use with this machine, you should
leave the XT harddisk support option tagged No. If you do need to support a very old hard
disk, seriously consider making the investment in upgrading the device to something more
current—if not for your performance, at least for the safety of
the data.
</P>
<A NAME="PAGENUM-64"><P>Page 64</P></A>
<H4><A NAME="ch05_ 12">
Networking Options
</A></H4>
<P>Because of the rate at which network technology evolves, covering specifics is difficult
because they become outdated too quickly. For this section on the Networking options, I'll cover
the basics along with some security notes. For specific features, you should check the help box
attached to each option on the Networking options submenu.
</P>
<P>Before getting into details, you should have a clear idea of what sorts of networking
features you expect your machine to offer. If your machine will spend a great deal of its time serving
or as a user's desktop machine, you should keep the network configuration simple and not
provide any elaborate services. On the other hand, if the machine is destined to become a
gateway/proxy service, you should pay attention to the details.
</P>
<CENTER>
<TABLE BGCOLOR="#FFFF99">
<TR><TD><B>
NOTE
</B></TD></TR>
<TR><TD>
<BLOCKQUOTE>
Because of the rapid developments in the networking industry, many options are
still experimental code. As a result, many of the Networking options will be dimmed if
you opted not to use any experimental code in the kernel. Don't be alarmed.
</BLOCKQUOTE></TD></TR>
</TABLE></CENTER>
</P>
<P>Assuming that you do want to join the network, you must turn on two of the options.
The first, of course, is TCP/IP networking. Tagging this option No dims all the other options.
The other option you must turn on is IP: syn cookies. Enabling this option is especially
important if you are going to be attached to the Internet in one way or another because it provides
protection against SYN attacks. (For additional details on SYN attacks as well as a various other
security-related issues, visit the CERT home page at
<a href="http://www.cert.org.)">http://www.cert.org.)</A>
</P>
<P>The essence of many of the Networking options is the ability to configure Linux to act as
either a router or a firewall. To access the firewalling options, be sure to enable the
Network firewall, Network aliasing, and IP: forwarding/gatewaying options. If you plan to use your
Linux machine in this fashion, you will probably want to enable the IP: accounting and IP:
optimize as router not host options.
</P>
<P>If you have trouble connecting to your Linux machine via Telnet from an older DOS
system, you might want to select Yes for IP: PC/TCP compatibility mode. Turning on this option
allows Linux to communicate with the older (and broken) software on the DOS side. The IP:
Disable Path MTU Discovery (normally enabled) option can also be a cause of problems with
older systems. Normally, Linux starts by sending larger packets of data across the network. If it
finds a machine that cannot handle the larger size, it brings the size down until everyone is
happy. Some older DOS machines with poorly written software don't handle this technique well
and need to have this option disabled. If that is the case, check Yes for this option.
</P>
<P>The IP: Reverse ARP option is useful if machines on the network use Address Resolution
Protocol (ARP) to determine the network's IP address based on its Ethernet address.
(Typically,
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