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List:       opensim-users
Subject:    [Opensim-users] NAT & Corporate Firewall
From:       jjustincc () googlemail ! com (Justin Clark-Casey)
Date:       2011-03-31 23:43:57
Message-ID: 4D9511BD.5040706 () googlemail ! com
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 From my understanding of the code, using 0.0.0.0 will make the UDP listen to the \
'most appropriate' IP address as  assigned to the server's NICs (see \
http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.bind.aspx,  \
IPAddress.Any = 0.0.0.0).

On a machine with just one NIC this should be fine.  But on a machine with two NICs \
I'm guessing you would really want  to explicitly state the right address.

The internal address is used to bind the UDP listener.  However, the client is told \
to connect to the external host name  (if this or the port is incorrect then the \
client connection will timeout on the 'connecting to region' bit).

Confusingly, the 'internal port' is used for both the internal UDP listener and is \
passed to the client as the external  connection port.

Some people on Stack Overflow think that IPAddress.Any means listen on all NICs 
(http://stackoverflow.com/questions/1777629/how-to-listen-on-multiple-ip-addresses).  \
But my reading of the MS SDK  reference above means that it only binds to one.  \
Anybody able to comment on this?

And does anybody actually use a non 0.0.0.0 internal address and in what context?  \
I'd really like to clear up my  understanding of this so that we can improve the \
instructions.


On 30/03/11 17:28, Adelle Fitzgerald wrote:
> As I understand it, that is used for binding opensim to a specific IP
> address, where the opensim server may have more than one IP address on a
> network interface or multiple network interfaces.
> 
> 0.0.0.0 = listen on all available IP addresses, or specify (bind) to a
> specific IP address.
> 
> 
> 
> -----Original Message-----
> From: opensim-users-bounces at lists.berlios.de
> [mailto:opensim-users-bounces at lists.berlios.de] On Behalf Of Edmund
> Edgar
> Sent: 30 March 2011 17:16
> To: opensim-users at lists.berlios.de
> Subject: Re: [Opensim-users] NAT&  Corporate Firewall
> 
> This probably won't help Fleep, but does anyone know what this
> broken-Englished sentence on the wiki is supposed to say?
> 
> # Internal IP address - This should always be 0.0.0.0 (0.0.0.0 means
> "listen for connections on any interface", basically a wildcard) if
> you want to access this server from the internet or another server on
> your internal network, this should be the IP address assigned to the
> OpenSim Server.
> 
> http://opensimulator.org/wiki/Configuration
> 


-- 
Justin Clark-Casey (justincc)
http://justincc.org/blog
http://twitter.com/justincc


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