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42 lines
2.3 KiB
42 lines
2.3 KiB
<sect1 id="troubleshooting-network-x">
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<sect1info>
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<authorgroup>
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<author>&J.Hall;</author>
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</authorgroup>
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</sect1info>
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<title>Networking and X</title>
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<para>
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Misconfigured networking can often be the cause of &tde; applications launching slowly, or in the worst case not launching at all. Your &X-Server; has a very powerful client/server interface and is very network aware.
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</para>
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<para>
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X uses the hostname to create both a unique key for authorization, and to figure out where (via $<envar>DISPLAY</envar>) to send
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the actual windows it's drawing on screen. If your computer doesn't know it's own name, it will spend inordinate amounts of time
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trying to look itself up, a fate you can avoid by simply teaching your computer what it's own name is.
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</para>
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<para>
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Check your <filename>/etc/hosts</filename> file and ensure there is an entry for localhost that looks
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something like this at the top of the file (after any comments).
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</para>
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<screen>
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127.0.0.1 localhost
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</screen>
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<para>
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You also should add your computers fully qualified domain name, short name, and it's usual ip address if it has a static ip. If your ip address is assigned dynamically using <acronym>DHCP</acronym> you can simply use the address for the loopback device.
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</para>
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<screen>
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127.0.0.1 hal.btl hal (for dhcp)
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192.168.0.1 hal.btl hal (static)
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</screen>
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<para>
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Make sure that your firewall is not so restrictive that it stops packets to the loopback device. For example in iptables if the default rule on the <parameter>INPUT</parameter> chain for this device is set to anything other than <parameter>>ACCEPT</parameter> this will cause performance problems in X. To check this, you can type in:
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</para>
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<screen>
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<prompt>%</prompt><userinput><command>iptables-save</command> <literal>|</literal> <command>grep</command> <option>lo</option></userinput>
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<computeroutput><option>-A</option> <parameter>INPUT</parameter> <option>-i</option> <parameter>lo</parameter> <option>-j</option> <parameter>ACCEPT</parameter>
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</computeroutput>
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</screen>
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<para>
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The rule <computeroutput><option>-A</option> <parameter>INPUT</parameter> <option>-i</option> <parameter>lo</parameter> <option>-j</option> <parameter>ACCEPT</parameter></computeroutput> should always work, unless there are other misconfigured rules (Such as a <parameter>DROP</parameter> on the <parameter>OUTPUT</parameter> chain)
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</para>
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</sect1>
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