44 lines
1.9 KiB
HTML
44 lines
1.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
|
|
<!--Converted with LaTeX2HTML 96.1-c (Feb 29, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -->
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>Resolver Robustness</TITLE>
|
|
</HEAD>
|
|
<BODY LANG="EN">
|
|
<A HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <BR>
|
|
<B> Next:</B> <A HREF="node86.html">Running named</A>
|
|
<B>Up:</B> <A HREF="node81.html">The Resolver Library</A>
|
|
<B> Previous:</B> <A HREF="node84.html">Configuring Name Server Lookups-- </A>
|
|
<BR> <P>
|
|
<H2><A NAME="SECTION008140000">Resolver Robustness</A></H2>
|
|
<A NAME="resolvrobustness"></A>
|
|
<A NAME="3378"></A>
|
|
If you are running a LAN inside a larger network, you definitely should
|
|
use central name servers if they are available. The advantage of this is
|
|
that these will develop rich caches, since all queries are forwarded to
|
|
them. This scheme, however has a drawback: when a fire recently
|
|
destroyed the backbone cable at our university, no more work was
|
|
possible on our department's LAN, because the resolver couldn't reach
|
|
any of the name servers anymore. There was no logging in on X-terminals
|
|
anymore, no printing, etc.
|
|
<P>
|
|
Although it is not very common for campus backbones to go down in
|
|
flames, one might want to take precautions against cases like these.
|
|
<P>
|
|
One option is to set up a local name server that resolves hostnames from
|
|
your local domain, and forwards all queries for other hostnames to the
|
|
main servers. Of course, this is applicable only if you are running
|
|
your own domain.
|
|
<P>
|
|
Alternatively, you can maintain a backup host table for your domain
|
|
or LAN in /etc/hosts. In /etc/host.conf you would then
|
|
include ``order bind hosts'' to make the resolver fall
|
|
back to the hosts file if the central name server is down.
|
|
<HR>
|
|
<ADDRESS>
|
|
<I>Andrew Anderson <BR>
|
|
Thu Mar 7 23:22:06 EST 1996</I>
|
|
</ADDRESS>
|
|
</BODY>
|
|
</HTML>
|