Attack of the spelling and grammar police. Things like nameserver and
mailserver are two words, folks.
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017cb38c08
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svn2git
2020-12-08 03:00:23 +00:00
svn path=/head/; revision=10309
1 changed files with 39 additions and 39 deletions
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@ -1,7 +1,7 @@
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<!--
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<!--
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The FreeBSD Documentation Project
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The FreeBSD Documentation Project
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$FreeBSD: doc/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml,v 1.77 2001/08/10 01:06:45 murray Exp $
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$FreeBSD: doc/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.sgml,v 1.78 2001/08/10 22:58:09 chern Exp $
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-->
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-->
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<chapter id="advanced-networking">
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<chapter id="advanced-networking">
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@ -292,7 +292,7 @@ Local1 (10.20.30.1, 10.9.9.30) --> T1-GW (10.9.9.1)
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<sect2>
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<sect2>
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<title>Routing Propagation</title>
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<title>Routing Propagation</title>
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<indexterm><primary>routing propogation</primary></indexterm>
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<indexterm><primary>routing propagation</primary></indexterm>
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<para>We have already talked about how we define our routes to the
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<para>We have already talked about how we define our routes to the
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outside world, but not about how the outside world finds us.</para>
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outside world, but not about how the outside world finds us.</para>
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@ -734,7 +734,7 @@ nfs_client_flags="-n 4"</programlisting>
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server's name will be <literal>server</literal> and the client's
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server's name will be <literal>server</literal> and the client's
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name will be <literal>client</literal>. If you just want to
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name will be <literal>client</literal>. If you just want to
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temporarily mount a remote file system or just want to test out
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temporarily mount a remote file system or just want to test out
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your config you can run a command like this as root on the
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your configuration you can run a command like this as root on the
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client:</para>
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client:</para>
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<indexterm>
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<indexterm>
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<primary>NFS</primary>
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<primary>NFS</primary>
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@ -813,7 +813,7 @@ nfs_client_flags="-n 4"</programlisting>
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<indexterm><primary>AMD</primary></indexterm>
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<indexterm><primary>AMD</primary></indexterm>
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<indexterm><primary>automatic mounter daemon</primary></indexterm>
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<indexterm><primary>automatic mounter daemon</primary></indexterm>
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<para>AMD is a usefull utility used for automatically mounting a
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<para>AMD is a useful utility used for automatically mounting a
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filesystem whenever a file or directory within that filesystem is
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filesystem whenever a file or directory within that filesystem is
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accessed. It will also unmount that filesystem when it has not
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accessed. It will also unmount that filesystem when it has not
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been used for a time.</para>
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been used for a time.</para>
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@ -829,10 +829,10 @@ nfs_client_flags="-n 4"</programlisting>
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this:</para>
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this:</para>
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<itemizedlist>
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<itemizedlist>
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<listitem><para>Someone cd's into
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<listitem><para>Someone <command>cd</command>'s into
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<filename>/host/${HOSTNAME}/exported_filesystem</filename>.</para></listitem>
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<filename>/host/${HOSTNAME}/exported_filesystem</filename>.</para></listitem>
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<listitem><para>AMD recieves the lookup request, and takes the
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<listitem><para>AMD receives the lookup request, and takes the
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<varname>${HOSTNAME}</varname> token.</para></listitem>
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<varname>${HOSTNAME}</varname> token.</para></listitem>
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<listitem><para>AMD attempts to resolve the HOSTNAME
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<listitem><para>AMD attempts to resolve the HOSTNAME
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<filename>/host/${HOSTNAME}/</filename> directory.</para></listitem>
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<filename>/host/${HOSTNAME}/</filename> directory.</para></listitem>
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</itemizedlist>
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</itemizedlist>
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<para>Setting up amd is actually quite simple, perhaps deceptively
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<para>Setting up <application>amd</application> is actually quite simple, perhaps deceptively
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so:</para>
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so:</para>
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<para>Put <varname>amd_enable="YES"</varname> in the
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<para>Put <varname>amd_enable="YES"</varname> in the
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@ -2891,7 +2891,7 @@ lrwxr-xr-x 1 root wheel 14 Nov 8 14:27 libscrypt.so@ -> libscrypt.so.2
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</indexterm>
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</indexterm>
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<para>DHCP is supported by <application>sysinstall</application>.
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<para>DHCP is supported by <application>sysinstall</application>.
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When configuring a network interface within sysinstall,
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When configuring a network interface within sysinstall,
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the first question asked is, "Do you want to try dhcp
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the first question asked is, "Do you want to try DHCP
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configuration of this interface?" Answering affirmatively will
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configuration of this interface?" Answering affirmatively will
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execute dhclient, and if successful, will fill in the network
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execute dhclient, and if successful, will fill in the network
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configuration information automatically.</para>
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configuration information automatically.</para>
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IP addresses, and vice versa. For example, a query for
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IP addresses, and vice versa. For example, a query for
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<hostid>www.freebsd.org</hostid>
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<hostid>www.freebsd.org</hostid>
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will receive a reply with the IP address of The FreeBSD Project's
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will receive a reply with the IP address of The FreeBSD Project's
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webpage, whereas, a query for <hostid>ftp.freebsd.org</hostid>
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web server, whereas, a query for <hostid>ftp.freebsd.org</hostid>
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will return the IP
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will return the IP
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address of the corresponding FTP machine. Likewise, the opposite can
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address of the corresponding FTP machine. Likewise, the opposite can
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happen. A query for an IP address can resolve its hostname. It is
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happen. A query for an IP address can resolve its hostname. It is
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<tbody>
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<tbody>
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<row>
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<row>
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<entry>forward dns</entry>
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<entry>forward DNS</entry>
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<entry>mapping of hostnames to IP addresses</entry>
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<entry>mapping of hostnames to IP addresses</entry>
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</row>
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</row>
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machine queries a name server for zone information</entry>
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machine queries a name server for zone information</entry>
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</row>
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</row>
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<indexterm><primary>reverse dns</primary></indexterm>
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<indexterm><primary>reverse DNS</primary></indexterm>
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<row>
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<row>
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<entry>reverse DNS</entry>
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<entry>reverse DNS</entry>
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<entry>the opposite of forward DNS, mapping of IP addresses to
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<entry>the opposite of forward DNS, mapping of IP addresses to
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</para>
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</para>
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<screen>&prompt.root; <userinput>cd /etc/namedb</userinput>
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<screen>&prompt.root; <userinput>cd /etc/namedb</userinput>
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&prompt.root; <userinput>sh make-localhost</userinput></screen>
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&prompt.root; <userinput>sh make-localhost</userinput></screen>
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<para>to properly create the local reverse dns zone file in
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<para>to properly create the local reverse DNS zone file in
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<filename>/etc/namedb/localhost.rev</filename>.
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<filename>/etc/namedb/localhost.rev</filename>.
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</para>
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</para>
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</sect3>
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</sect3>
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<varlistentry>
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<varlistentry>
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<term>PTR</term>
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<term>PTR</term>
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<listitem><para>a domain name pointer (used in reverse dns)
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<listitem><para>a domain name pointer (used in reverse DNS)
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</para></listitem>
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</para></listitem>
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</varlistentry>
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</varlistentry>
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</variablelist>
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</variablelist>
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</para>
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</para>
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<para>
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<para>
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For in-addr.arpa zone files (reverse dns), the same format is
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For in-addr.arpa zone files (reverse DNS), the same format is
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used, except with <varname>PTR</varname> entries instead of
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used, except with <varname>PTR</varname> entries instead of
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<varname>A</varname> or <varname>CNAME</varname>.
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<varname>A</varname> or <varname>CNAME</varname>.
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</para>
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</para>
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<sect2 id="setup">
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<sect2 id="setup">
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<title>Setup</title>
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<title>Setup</title>
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<para>Due to the diminishing IP space in ipv4, and the increased number
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<para>Due to the diminishing IP space in IPv4, and the increased number
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of users on high-speed consumer lines such as cable or DSL, people are
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of users on high-speed consumer lines such as cable or DSL, people are
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in more and more need of an Internet Connection Sharing solution. The
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in more and more need of an Internet Connection Sharing solution. The
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ability to connect several computers online through one connection and
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ability to connect several computers online through one connection and
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not be desired at all because they provide an attacker with too
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not be desired at all because they provide an attacker with too
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much information.</para>
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much information.</para>
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<para>Some daemons are not security-concious and have long, or
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<para>Some daemons are not security-conscious and have long, or
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non-existent timeouts for connection attempts. This allows an
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non-existent timeouts for connection attempts. This allows an
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attacker to slowly send connections to a particular daemon, thus
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attacker to slowly send connections to a particular daemon, thus
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saturating available resources. It may be a good idea to place
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saturating available resources. It may be a good idea to place
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