[Opensim-users] NAT & Corporate Firewall

[Fleep Tuque]

Gary's explanation that an IP address instead of a hostname is being passed
to the client for the UDP handshake seems to fit the symptoms I'm seeing.
 We have verified that UDP ports are open in the firewall and that UDP
packets can be sent and received from off campus, so I'm 99.99% sure that
this isn't a firewall problem.

I've also double checked the opensim.ini, robust.ini, gridcommon.ini, and
region.ini files and do not have a single IP address listed anywhere, all
the configuration options I've set use a hostname.  However, when I try to
connect with a client from off campus and capture packet traffic with
Wireshark, I see the TCP packets being sent to the right destination IP
address, but the UDP packets are being sent to an internal IP address
(10.23.23.x) which of course will never work from off campus.  Something is
sending the client that internal IP address to be sure!  :)

- 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 Tue, Apr 5, 2011 at 7:57 AM, Diva Canto <diva at metaverseink.com> wrote:

> On 4/4/2011 9:23 PM, Gary Beck wrote:
>
>> Diva Canto wrote:
>>
>>> DNS resolution is made by the client. The server simply passes the name
>>> over. Make sure to use domain names consistently in all configuration files.
>>>
>> ----------------------------------------------------------------------
>> My testing seems to show the IP address rather than domain name is passed
>> to the client for region/UDP.
>>
>> I have one region using ExternalHostName=SYSTEMIP and the others using
>> ExternalHostName=something.dyndns-mail.com
>> I run Opensim 0.7.0.2 on a VISTA system, stand alone mode, client access
>> both local and external, NAT loopback on.
>> All that works fine.
>>
>
> SYSTEMIP is an IP address. If that's what you have, that's what will be
> sent to the client.
> I suggest people people use domain names everywhere for ExternalHostName
> and do local DNS mapping if necessary -- this may be needed in home
> networks.
>
>
>  One other item I found that suggests IP addresses are being passes rather
>> than domain names is the Entity Transfer Module entries in the server log
>> 2011-04-04 22:24:53,759 INFO  -
>> OpenSim.Region.CoreModules.Framework.EntityTransfer.EntityTransferModule
>> [ENTITY TRANSFER MODULE]: Starting to inform client about neighbour 999,
>> 999(174.124.181.36:9009)
>>
>
> This has nothing to do with client communications -- it's the backend
> server-to-server communications for handing the agent over to the other sim.
>
>
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>
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