[Opensim-users] NAT & Corporate Firewall

[Fleep Tuque]

Sorry I haven't replied in a few days, had an inconvenient office move in
the middle of all this.

Justin wrote:

*Confusingly, the 'internal port' is used for both the internal UDP listener
and is passed to the client as the external connection port.*
*
*
It sounds like this might be part of the problem with our campus set up.  I
couldn't figure out where the client was even getting the 10.23.23.x
internal address to send packets to, but it appears that if I leave the
default InternalAddress = 0.0.0.0 in the region.ini file, then somehow that
is passed to the off-campus client as the internal IP, which of course
doesn't work.

Will consult with the NOC again with this latest information and many thanks
to all for helping shed light on this.

Sincerely,

- Chris/Fleep


Chris M. Collins (SL: Fleep Tuque)
Project Manager, UC Second Life
Second Life Ambassador, Ohio Learning Network
UCit Instructional & Research Computing
University of Cincinnati
406E Zimmer Hall
PO Box 210088
Cincinnati, OH 45221-0088
(513)556-3018
chris.collins at uc.edu

UC Second Life:   http://homepages.uc.edu/secondlife
OLN Second Life: http://www.oln.org/emerging_technologies/emtech.php



On Thu, Mar 31, 2011 at 7:43 PM, Justin Clark-Casey <
jjustincc at googlemail.com> wrote:

> 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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> Opensim-users at lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/opensim-users
>
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