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<H3><A NAME=SECTION00732800000000000000>5.3.2.8 Trying it out</A></H3>
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<A NAME=5902>&#160;</A>
<A NAME=5903>&#160;</A>
Once you have all of these files set up, you should be able to reboot
your new kernel and attempt to use the network. There are many places where
things can go wrong, so it's a good idea to test individual aspects of
the network configuration (e.g., it's probably not a good idea to test
your network configuration by firing up Mosaic over a network-based X
connection).
<P>
<A NAME=6100>&#160;</A>
<A NAME=5905>&#160;</A>
You can use the <tt>netstat</tt> command to display your routing tables;
this is usually the source of the most trouble. The <tt>netstat</tt>
man page describes the exact syntax of this command in detail.
In order to test network connectivity, we suggest using a client such
as <tt>telnet</tt> to connect to machines both on your local subnetwork
and external networks. This will help to narrow down the source
of the problem. (For example, if you're unable to connect to local machines,
but can connect to machines on other networks, more than likely there
is a problem with your netmask and routing table configuration).
You can also invoke the <tt>route</tt> command directly (as <tt>root</tt>) to
play with the entries in your routing table.
<P>
You should also test network connectivity by specifying IP addresses
directly, instead of hostnames. For example, if you have problems with
the command
<P><TT> $ <em>telnet shoop.vpizza.com</em>
<P></TT>
the cause may be incorrect nameserver configuration. Try using
the actual IP address of the machine in question; if that works, then
you know that your basic network setup is (more than likely) correct,
and the problem lies in your specification of the name server address.
<P>
Debugging network configurations can be a difficult task, and we can't
begin to cover it here. If you are unable to get help from a local guru
we strongly suggest reading the <em>Linux Network Administrators' Guide</em>
from the LDP.
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<P><ADDRESS>
<I>Matt Welsh <BR>
mdw@sunsite.unc.edu</I>
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