[Freeciv-Dev] Re: (PR#6707) Announce server on LAN

["Todd Goodman" <tsg@xxxxxxxxxxxxx>]

* Raimar Falke <i-freeciv-lists@xxxxxxxxxxxxx> [031105 07:23]:
> On Tue, Nov 04, 2003 at 02:16:00PM -0800, John Bauman wrote:
> > > So if we choose 224.0.0.1 we know that all hosts are on this group AND
> > > we know that the TTL is irrelevant since the packets are routed.
> > Why do you want to use an address that all hosts are on? Wouldn't it be
> > better if only the hosts that cared got messages (as small as they may be)?
> 
> Do you know how you join with your computer a special multicast group? 
> I don't.

Yes, the way he was doing it (SIOCADDMULTI).

You do it on the server and clients and now only those hosts who care
about receiving the packets get them.

> 
> It reduced the usefulness of the new feature if you had to adjust your
> OS in some way. But there is already a default group and it is limited
> so that you don't spam the whole internet.

You don't have to adjust your OS.  The server and clients do it
programatically.  You set TTL to 1 so you don't send anything off LAN.

There's nothing the user needs to do (unless their OS doesn't support
multicast, in which case it doesn't matter what you do as this feature
wouldn't work...)

There's a pretty good chance that traffic to 224.0.0.1 will never make
it off the local network no matter what you set the TTL to as the router
isn't supposed to forward it regardless.

Todd

> 
>       Raimar
> 
> -- 
>  email: rf13@xxxxxxxxxxxxxxxxx
>  "I heard if you play the NT-4.0-CD backwards, you get a satanic message."
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