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   <H1>[Nel] Re:More news from the nevrax teams...</H1>
    <B>Dim Segebart</B> 
    <A HREF="mailto:zager%40teleaction.com"
       TITLE="[Nel] Re:More news from the nevrax teams...">zager@teleaction.com</A><BR>
    <I>Thu, 21 Jun 2001 19:33:30 +0200</I>
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<PRE>It makes sense.
Thank you.

Thursday, June 21, 2001, 6:47:37 PM, you wrote:

DM&gt; To extend the explanation a little - the way we see things is this:

DM&gt; - The server sets for MMORPGs and the like have to be secure - that means
DM&gt; that any old Tom, Dick or Harry can't send a message directly to the economy
DM&gt; service to tell it that they've just won the lottery :)

DM&gt; - This means that the clients only have access to the front end services on
DM&gt; the front end servers and that they don't have access to the naming service.
DM&gt; (in order to connect to the front end services clients have to use the login
DM&gt; service as a go-between... there are examples in our samples directory
DM&gt; showing how this works)

DM&gt; - So - the naming service runs on a smallish LAN that connects the game
DM&gt; servers.  It broadcasts messages like 'the xxx service has just arrived at
DM&gt; address yyy' or 'the www service at address zzz has gone down/ disappeared'.
DM&gt; These are cached by each service to keep an up to date address book of the
DM&gt; other services that they can talk to.

DM&gt; - In the normal way we don't see services being started or stopped as a very
DM&gt; high frequency event.

DM&gt; I hope this helps.

DM&gt; Daniel.


DM&gt; --------------------------------------------------------------------
DM&gt; Hello,


&gt;&gt;<i> I have a question about the caching for the naming service. You say it
</I>&gt;&gt;<i> automatically corrects caches when services move or are deleted. This
</I>&gt;&gt;<i> doesn't sound very scalable, it every client querying the name server
</I>&gt;&gt;<i> has to be contacted when something they asked about changed (especially
</I>&gt;&gt;<i> over high latency links).
</I>

DM&gt; Right, but in fact, we developed the system to fit our requirement for our
DM&gt; game and in our system (in the shard), the naming service and all  ther
DM&gt; services are on a LAN, so we don't have high latency links.

DM&gt; regards,

DM&gt; Vianney Lecroart

DM&gt; _______________________________________________
DM&gt; Nel mailing list
DM&gt; <A HREF="mailto:Nel@nevrax.org">Nel@nevrax.org</A>
DM&gt; <A HREF="/mailman/listinfo.cgi/nel">/mailman/listinfo.cgi/nel</A>



-- 
Dim Segebart                         mailto:<A HREF="mailto:zager@teleaction.de">zager@teleaction.de</A>



</pre>



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